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Sustainability Events

Sustainable Tucson - TUCAN – Tucson Climate Action Network meets 2nd Wednesdays at Pima Friends Meeting House, 

31 N 5th Ave, Tucson AZ

Bioneers - 26th Annual Conference at the Marin Center in San Rafael, CA - October 20 - 22, 2017


Solar Living Institute Workshops - Travel to northern California for this one - Two or more days of workshops to learn 

about Sustainable Energy Installations


Conference and Workshop Events - Posted by Renewable Energy Access Magazine


Events and Workshops - Posted by Photon Magazine


Arizona Solar Events Calendar

US Social Forum - Philadelphia, PA - June 25 - 28, 2015 & San Jose, CA - June 24 - 28, 2015

Energy Systems & More

Tesla Motors - Factory site - Tesla forum - The Drive blog - Tesla Motors Blog - Full-On Electric Vehicles - Full-On Electric Vehicles - Model 3 Auto Blog

Emerald Mountain Energy - Founded in June 2005 - Solar in Steamboat Springs, CO, commercial and private installations and service - Posted 01/20/2014


Solar Living Institute - "Hands-on workshops on Renewable Energy, Ecological Design, Sustainable Living Practices and Alternative Construction Techniques like Strawbale, Cob, and Bamboo"

Southwest Windpower - FLAGSTAFF, AZ - "A new small residential wind generator from Southwest Windpower will give homeowners a new weapon in the fight against rising electricity costs"

Northern Arizona Wind & Sun - "Has been providing solar electric and backup power systems since 1979" - More Links - DC to AC Power Invertors for Home and Recreation

Backwoods Solar Electric Systems -  Off-grid, Baybee!

PowerFilm Solar - Solar Film Power Generating Systems

OutBack Power Systems - "Manufacturer of Renewable Energy and Back-Up Power System Equipment"

Mr - Renewable Energy Products

Colorado Solar - Specializing in solar panels, components, and complete systems - Offers an on-line catalog and system design information for our customers with the highest return on investment - Designs and installs performance Solar Energy Systems"

Solarwinds-energy - Wind and PV Home, RV and Marine Installations

Solar Century - "UK's leading Solar Photovoltaics (SPV) company"

Sunsence - "Designs, installs, and services solar energy systems for Residential and Commercial clients"

Links  - To Electric Vehicles - Thanks to Electric Auto Association  -   Phoenix Chapter

Zap World Electric Vehicles - The way to go!

Silicon Solar, Inc. - "World's largest selection of Solar Panels, Solar Lights, Solar Cells and Solar fountains"

Wireless Mesh Network - [Or] "How to Keep the NSA Out of Your Computer" - from Mother Jones

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Agua Caliente Solar Project - "The world's largest photovoltaic solar generating facility, currently being built in Yuma County, Arizona" - Posted 08192013

HomePower Magazine - Lithium-Ion Batteries for Off-Grid Systems

CleanPowerAuto LLC - "[They offer] battery management system[s] designed for LiFePo4 cells, used in Electric Vehicles"

HousePower BMS - "HousePower BMS is designed for marine, RV, solar, etc. house banks with 12V,24V,36V or 48V nominal bank voltage. With this system you can simply replace old Lead Acid bank with LiFePo4 bank with little to no changes to your existing wiring. BMS will protect the bank from reaching steep ends of charge/discharge curve, hence prolong its life and prevent individual cell damage."

Mosaic - "Mosaic connects investors to high quality solar projects."

Greentech Media - News in the green markets - "Energy storage markets quadruples in 5 years." - Map (pdf) of Solar Thermal installs in the Southwest, USA

Linc Volt - Created by our own Neil Young! "Automobile propulsion technology that serves the needs of the 21st Century and delivers performance that is a reflection of the driver's Spirit - By creating this new power technology we hope to reduce the demand for petrol-fuels enough to eliminate the need for war over energy supplies. Thereby enhancing the security of the USA and other nations throughout the world."

Concentrating Solar Thermal Power 2012 - Better late than never! - Concentrating Solar Thermal Power - A nuclear power replacement, thanks to Arizona Power Service (APS),  starts its 2nd Solar Thermal Plant in Arizona.

Photon Magazine - "The Solar Power Magazine"

Current Solar and Wind Installation Jobs - Thanks to RenewableEnergyAccess

Environmental Jobs Network (EJN) - "Leading online resource for environmental job seekers, professionals and career changers"

Rocky Mountain Institute - "Engaged in cutting-edge research on oil independence: Renewable Energy Technologies,  Distributed Energy, resource planning,  Green Buildings and Radically Efficient Transportation"

Solar Utilities Network - "Not-for-profit informational website - In support of Global Efforts to reform energy use"

Energy Business Daily - The Good, the Very Good and the not-so-good approaches to our Sustainable Energy Needs

Solartopia - "Shows us a world free of coal, oil, nukes and gas (King CONG), where efficiency and the revival of mass transit have made possible a post-pollution planet supremely prosperous"

National Renewable Energy Laboratory - Golden, CO - "Research and development of Renewable Fuels and Electricity"

Cal Cars - "A non-profit startup formed by entrepreneurs, engineers, Environmentalists and consumers [Customer-Citizens] - Our projects tackle energy security, jobs and Global warming at the same time."

EcoBusinessLinks - Environmental Directory

ZeitNews - The latest in Humane, Human Technologies for Conscious People in the 21st century - Let's Hope!

Space Science and Engineering Center - "Geophysical research and technology to enhance understanding of the atmosphere of Earth, the other Planets in our Solar System, and the Cosmos"

Post Carbon Institute - "The strategy of Relocalization, which aims to rebuild societies based on the local production of food and energy, and the Relocalization of currency, governance and culture"

Links - Provided by Ft. Lewis College Environmental Center, Durango, CO

Links to Electric Vehicles thanks to Electric Auto Association - Phoenix Chapter

ACE3 - "The American Council for an Energy-Efficient Economy is a nonprofit, 501(c)(3) organization dedicated to advancing energy efficiency as a means of promoting both economic prosperity and Environmental Protection."

Alternative Fuels Data Center - "Biodiesel, electricity, ethanol, Hydrogen, natural gas, and propane. This site has more than 3,000 documents in its database." [This author says no to the carbon emitters here] - "When you might see a Plug-in Hybrid arrive at your local dealership, we have begun our efforts to build this section of "" dedicated to the early stages of the plug-in movement."

The Buckminster Fuller Institute - "Buckminster Fuller challenged us with a bold Vision -To make the world work for 100% of humanity in the shortest possible time through spontaneous cooperation without Ecological offense or the disadvantage of anyone."

Sustainable Arizona - "Dedicated to improving the quality of life in Arizona and the Southwest - We work with businesses, individuals, governments and other organizations to build resilient economies, strong communities and healthy natural environments."

Solar Cookers International - "An ideal addition to any kitchen wherever there are predictable hours of Sun"

Co-op America - "Mission is to harness economic power: The strength of consumers [Customer-Citizens], investors, businesses, and the marketplace to create a Socially Just and Environmentally Sustainable Society."

Fair Trade Certified - "Innovative, market-based approach to Sustainable Development - The 'Fair Trade Certified' label guarantees that farmers and workers received a Fair Price for their product."

Greenpeace International - "Greenpeace exists because this fragile Earth deserves a voice. It needs solutions. It needs Change. It needs action."  Greenpeace USA - Genetic Engineering - GM Foods - in your country?

Prometheus Institute for Sustainable Development - "US-based non-profit focusing on collecting and disseminating information on all types of technology and processes used in promoting Global economic, industrial, and Societal Sustainable Development

American Wind Energy Association - "Promote Wind Power growth through Advocacy, Communication and Education" - Wind Energy Projects throughout the US

Alternative Energy Institute - "Wind Energy Systems" - From Texas A&M University

Green Car Congress - An up-to-date news source: "The path to Sustainable Mobility is complex.  Competing and complementary approaches to Alternative Energy Sources, Production, Distribution and Applications; Fuel and power-train options, materials"

RenewableEnergyAccess - "Formerly SolarAccess"

Photon Magazine - "Your 'Global Navigation System' through the PV industry"

E Magazine - The Environmental Magazine

Earthscan - "Look out for a new Sustainability subject page."

Solar Today - "Covers all Solar and Renewable Energy Technologies, from Photovoltaics to Climate-Responsive Buildings to Wind Power and Biomass"

Windpower Monthly - "No hidden allegiances and no economic ties - 'Windpower Monthly' is free to report technology flops and development errors, bureaucratic incompetence and government failings."

MotherEarthNews - Home, Do it yourself, Renewable Energy, Green Homes,Organic Gardening, Natural Health, Green Transportation, Nature & Community, Modern Homesteading, Sustainable Farming, Real Food and Land for sale - Paid Subscription
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H2Nation - "H2Nation is a catalyst to help you, our nation, and others in the world, make the decisions necessary to transition into the new Hydrogen Economy."  Paid Subscription Only

Building - (Paid Subscription) - "Is committed to providing accurate, unbiased, and timely information to help building professionals improve the Environmental performance of buildings and surrounding landscapes"

Resurgence Magazine - "Cutting edge of current thinking, promoting Creativity, Ecology, Spirituality and Frugality"

Permaculture Magazine (Paid Subscription) - "Solutions for Sustainable Living"

Grist - "News about Green Issues and Sustainable Living"

Orion Magazine - Influential forum for re-imagining Humanity's relationship to Nature, featuring America's foremost writers and artists"

Ode Magazine - "Sometimes it’s difficult to see beyond the war, poverty, exploitation and pollution that the mainstream media use to fill our view of the World."

Back Home Magazine - "Delivers useful Do-It-Yourself Information on Sustainable, Self-Reliant Living"

Rocky Mountain Institute - "We use Whole-System Analysis to achieve vastly greater productivity from Energy and Resources."

Community Supported Agriculture (CSA)- "Food Production, sales and distribution aimed at both increasing the Quality of Food and the Quality of Care Given the Land, Plants and Animals, while substantially reducing potential Food losses and financial risks for the producers"

Solar Living Institute - "Established in 1998 as a spin-off from 'Real Goods Trading Company,' the 'Solar Living Institute' in Hopland, CA, is a 501(c)(3) non-profit educational organization that promotes Sustainable Living through inspirational Environmental Education - Everything Medical."

Institute for Sustainable Power (ISPQ) - "A means to compare content, quality, and resources across a broad range of training programs"

Build It Green - "Mission is to transform the building industry so that buildings are remodeled and built using Green Practices and Products"

Concrete Work - "Earth's Largest Directory of Concrete Services"

Investors' Circle - "See how angel investors, venture fund managers, foundations and financial institutions can, linked together, become a significant force for Social Change - Supporting entrepreneurial companies that are accelerating the transition to a Sustainable Economy."

Tikkun Magazine - "Vision of Healing and Transforming Our World - We include in this call both the Outer Transformation needed to achieve Social Justice, Ecological Sanity, and World Peace and the Inner Healing needed to foster Loving Relationships, A Generous Attitude toward the World and toward Others unimpeded by the distortions of our egos."

San Francisco Institute of Architecture - "SFIA has the nation’s first and most comprehensive Eco-Design programs including distance learning and continuing education."

Zucker Architecture - It’s Organic!

Hemp Industries Association - "Hemp’s Oilseed makes High-Grade Food and beauty products. The stalks produce Fiber and Cellulose for everything fromautomotive parts and fine clothing to building products and fuel."

New Belgium Brewing Company - "Took an employee vote and decided to commit to being the nation’s first 100% wind-powered brewery"

Air Quality Sciences - At AQS, Indoor Air Quality (IAQ) is an Integrated Science.

LEED - Leadership in Energy and Environmental Design - "Green Building Rating System"

Greenguard - Environmental Institute - The resource for Healthy Indoor Environments

U.S. Green Building Council - Promotes buildings that are Environmentally Responsible, profitable and Healthy Places to Live and Work
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Synthesis/Regeneration - A "Magazine of Green Social Thought" - "A journal of debate on social and political matters of interest to Greens and a resource for Green and allied organizers working on technological, Environmental, trade and other issues and on Green Party organization-building - We invite articles from all Green Perspectives."

What is Enlightenment? Magazine (WIE) - "Need not only Radical Individual Creativity but Radical Collective Engagement"

OrganicConsumers[Customer-Citizens].org - Campaigning for Food Safety, Organic Agriculture, Fair Trade & Sustainability

Solar Energy International - "Our mission is to provide education and technical assistance so that others will be empowered to use Renewable Energy Technologies

Health Care without Harm - Everything Medical

Greenpeace International - "Greenpeace exists because this fragile Earth deserves a voice.  It needs Solutions. It needs Change. It needs action." - Greenpeace USA - Genetic Engineering

Building Green - The material on "" - Articles, News, Reviews, Product listings, Case studies - Is organized into a hierarchy of topics related to Green Design and Construction. -You can find all of this material on the site by browsing these topics.

Alternative Medicine Foundation - "Providing consumers [Customer-Citizens] and professionals with responsible, evidence-based information on the Integration of Alternative and conventional Medicine.

Herbal Medicine Information - Fee based - "An Interactive electronic Herbal Database provides hyperlinked access to the scientific data underlying the use of Herbs for Health"

Clean Energy States Alliance - Promoting Renewable Energy and Clean Energy Technology by improving public and private investment strategies

Eco-Living - Cultural and Ecological Designing - Eco-Living Shelters

Aquaponics Library - Everything Fish, Plants and Ponds

New Mexico Solar Energy Association - Sustainable Energy Events and Information in New Mexico

Linear City Concepts - A Sustainability Concept Site

New Mexico Conservation & Management - "Renewable Energy for a Cleaner, Greener Tomorrow"

Electro Automotive - "We believe in Electric Vehicles built to Live in the Real World."

EV Innovations - "Formerly 'Hybrid Technologies, Inc'." - "Development and marketing of Lithium Powered Vehicles, Products, commercial and residential properties"

Bainbridge Island Graduate Institute

Saybrook Graduate School

Alternative Energy Institute

Sustainable DevelopmentAppalachian State University

Solar Energy ApplicationsColorado State University - and the College of Engineering

Florida Solar Energy Center

University Center of Excellence for Photovoltaics at Georgia Institute of Technology

Midwest Renewable Energy Association - (MREA)

North Carolina Solar Center

San Juan College

SoLEnergy - "With 20 ISPQ Certified Trainers and 24 NABCEP Certified Solar Installers - More than any other Solar training organization - Solar Energy International's experienced team"

Southwest Technology Development Institute

Sunnyside Solar

Lowell Solar Energy Engineering

Solar Engineering Program - University of Wisconsin at Madison

International Solar Energy Society

WindHunter - "Hydrogen can be produced by wind turbines and electrolysers on the proposed WINDHUNTER vessels. These large ships or platforms will operate out of sight of land either moored or anchored while facing into the wind and the oncoming waves."

Punta Mona Center - Sustainable Living and Education - "An 85-acre Organic Farm and Educational Retreat center located on the southern Caribbean coast of Costa Rica"

Institute for Sustainable Power (ISPQ) - "A means to compare content, quality, and resources across a broad range of training programs"

Solar Energy International - "New! Our mission is to provide education and technical assistance so that others will be empowered to use Renewable Energy Technologies."

Ecoversity - "Farmers, Parents, Professionals, Ecological Activists, Gardeners, Youngsters, Elders and Designers all converge at our campus"

C.O.R.E. - "A site devoted to Helping People understand energy"

Arizona Solar Center - Arizona Source for Solar Energy  Information

Solar Energy Industries Association - "Very up-to-date information on retailers and distributors dedicated to advancing the use of Solar Energy for the benefit of U.S. Citizens and the Global Environment - ASES promotes the widespread near and long-term use."

Green Car Congress - "Dedicated to bringing news and analysis of the energy choices, technologies, products, issues and policies related to Sustainable Mobility - To that broad audience"

Hybrid Center: Hybrid Cars, Trucks, and Suvs - "The Union of Concerned Scientists' '', your one-stop shopping for the consumer [Customer-Citizen] and technological information"

Solar Living Institute - "Established in 1998 as a spin-off from 'RealGoods Trading Company', the 'Solar Living Institute' in Hopland, CA is a 501(c)(3) non-profit educational organization that promotes Sustainable Living through Inspirational Environmental Education."

US Department of Energy Portal - "A gateway to hundreds of Web sites and thousands of online documents on energy efficiency and renewable energy." [Watch out! They are currently controlled by multi-national corps who don't give a damn about us or the Environment, ONLY PROFIT!]

American Solar Energy Society (ASES)(Paid Subscription) - Dedicated to advancing the use of Solar Energy for the benefit of U.S. Citizens and the Global Environment

D.S.I.R.E. - The Database of State Incentives for Renewable Energy is a comprehensive source of information on state and local, utility and selected federal incentives that promote Renewable Energy.

Post Carbon Institute - "Assist in the effort to Relocalize communities and adapt to an energy constrained world"

OK Solar - Power shingles for roofs

Electric Auto Association - "Strives to advance Electric Vehicle (EV) awareness"

Journey to Forever Online Biofuels Library - Absolutely comprehensive!

Make Your Own Biodiesel - "Anybody can make Biodiesel. It's easy. You can make it in your kitchen." - "The Official Site of the 'Biodiesel Board'." - Where to buy Biodiesel

Journey to Forever - Sustainable Living rules!

Bio-diesel Now - "Biodiesel is a Vegetable oil-based fuel that runs in unmodified diesel engines for cars, buses, trucks, construction equipment, boats, generators and oil home heating units."

American Wind Energy Association - "We Promote Wind Energy Production through advocacy."

Northern Power Systems - "Designs, builds, installs and services on-site and integrated power systems that provide commercial, industrial and government customers with an invaluable asset, power independence"

Earthscan - A leading provider of information for energy and environment professionals worldwide

Clean Energy States Alliance - Promoting Renewable Energy and CleanEnergy Technology by improving public and private investment strategies
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Corporate Solar
Acro Solar Lasers - Mirrored Fiberglass dishes track the sun on two axis, heat homes, pools, spas and domestic water.  Now available in kits - Computer management system included

Alternate Energy Technologies, LLC - Solar rooftop heating Systems - Has been installing solar energy for home and business in Southern California since 1974

Ameco Solar - AMECO provides solar energy systems that heat pools, spas, domestic hot water or PV for electricity.

American Solar Energy - Specializing in solar pool heating, solar water heating, and solar electric panels

ACR Solar International, Inc - Manufacturer and distributor of a low-cost solar water heater that can be owner installed - The modular system comes with easy-to-follow instructions for installation utilizing your existing 40 (plus) gallon water heater. The 20 square foot (20"x12') collector comes in two easy to connect six foot sections, and weighs under 38 pounds.

ARCON - A world leader in solar heating - ARCON Solvarme A/S has been in production and sale of solar heating systems in Denmark - Solar water heating systems and design - Pages are in English

Australian Solar and Air - Energy efficient solar water heating equipment, including household and swimming pools in conjunction with solar electric

Enersol - Manufacturer of Solar Heating Products and Systems for swimming pools and spas

Enolar Systems Marketing Pvt. Ltd. - Mfrs. of Solar Energy Devices such as Solar Water Heaters, Solar Cookers, Solar Lighting, Solar Dryers, etc

FAFCO - Solar Pool Heating Products - The oldest and largest manufacturer of solar pool heating systems in the U.S. & leading provider of IceStor thermal energy storage systems

Apricus - Solar Water Heater - Manufacturer and exporter of solar energy heating systems including solar water heater and evacuated heat pipe solar collector

Heliocol Inc. - Solar pool heating - Heat your swimming pool with the sun. Solar panels for pool heat.

Imagination Solar Limited - Supply and installation, or supply only, of simple effective solar water heating systems for the home, swimming pools, caravans and boats

IT Power Online - Website is part of the EC-funded project aimed at strengthening the European Solar Water Heater (SWH) industry by increasing the market penetration of SWH in parts of Europe.

Megasun Solar Systems - Manufacturers and exporters of hot water solar systems, panels, collectors and water heaters

Occidental Power - Retailer, designer, and installer of quality solar energy systems - Licensed California Solar Contractor

ORMAT - Power & Renewable Energy - Develops and manufactures modular power plants that use energy from locally available sources such as geothermal, waste heat, biomass, solar, and low grade fuels - Also produces remote micro turbine power units

Performance Solar - Solar pool heating - Serving Southern California, San Diego, Riverside County, Orange County and Southern Arizona

Professional Solar Products - Makes an all-metal swimming pool solar energy collector for solar pool heating and mounting systems for installing solar panels in virtually any location or situation

QIS Solarwise - Solar Energy, Pool Heating and Insulation - QIS is in the energy conservation industry. Specializes in Solarwise Pool heating, Ventilation, and Insulation products for domestic, commercial and industrial markets

Six Rivers Solar, Inc. - Manufacturers of water storage tanks for solar water heating, radiant floor heating and complete kits for solar power and solar water heating systems

Solar Components Corp. - Manufacturer of passive solar heating, greenhouses, aquaculture tanks, and environmental containers

Solar Source - Solar heating for water, pools, and homes - Exclusive Heliocol distributorship in the Tampa Bay area based in St. Petersburg, Florida.

Solarcon-Solar Controller Repair - Repairs of Heliotrope General and most Independent Energy solar controllers, related products, and sells Flo-Verter valves and solar sensors - Over 19 years of factory experience.

Solar-International - Manufacture, distribution of high-performance evacuated tube collectors and ecological house-technology, heat pumps and wall heating, solar water heater

Solarjoules - Canadian based retailer of solar water heating systems, offering solutions to people who want to be less dependent on conventional heating techniques

Solarnetix Inc. - Design and manufacture solar hot water heating systems for all types of buildings - Produce flat plate and vacuum tube solar panels, and the Duonetix microcomputer-controlled pump station

Solarsense (UK) Ltd - Suppliers and installers of Thermomax advanced solar collectors for solar water heating and photovoltaic solar systems for electricity generation - Solarsense b9 nrg - Photos of products company location, information solar and wind power UK

Sundwel Solar Ltd UK - Solar Heating using the latest in technology - Atlas Solar panels - Providing hot water that doesn't cost the Earth. Protect the Environment by using Renewable Energy

SunEarth Inc. - Manufactures industry standard solar water heating collectors and systems for residential and commercial applications

Superior Solar Systems, Inc. - Superior Solar Systems is a Longwood, FL based solar contractor, specializing in all aspects of solar power/capture - Founded in 1984.

Thermo Dynamics Ltd. - A company engaged in the research, development, and manufacturing of solar thermal products - Products range from residential solar water and space heating to industrial and commercial process heating.

Thermomax Industries, Ltd - Distributor of quality vacuum tube collectors and stainless tanks since 1989 - Proven, versatile heating solutions for 'off-grid' or low-impact living - This educational site includes schematics and manuals.

Thermomax Technologies - Manufactures evacuated heat pipe solar collectors, temperature control and monitoring devices

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Technical Glossary

Courtesy of Home Power Magazine - "Solar, Wind, and Microhydro Electricity, Home Energy Efficiency, Solar Hot Water Systems, Space Heating and Cooling, Green Building Materials and Home Design, Efficient Transportation"

The absorber is that part of a solar thermal collector that receives the incident radiant energy and transforms it into heat energy.

A system that traps the sun's energy with solar collectors and uses an electromechanical subsystem to move that energy to its point of intended use for water heating, space heating, pool heating, industrial process heat, electrical generation and space cooling.

An electrical current in which the direction of electron flow reverses periodically, usually many times per second. Most U.S. household electrical systems use AC current rated at 120 volts and 60 cycles per second.

A mechanical device that generates alternating current electricity.

The angle of the sun above the horizon (at high-noon), measured in degrees. In winter, the sun is at a low solar altitude, and in the summer, the sun is at a high solar altitude.

A device used for measuring the current (amperage) at any point in an electrical circuit.

A thin-film PV silicon cell having no crystalline structure.

Refers to the highest safe amount of electrical current through conductors, overcurrent devices, or other electrical equipment. Ampacity is determined by the cross-sectional area and the material of the conductor, or the manufacturer’s equipment rating.

The rate of flow of electrical charge. Unit of electrical current. One volt across one ohm of resistance causes a current of one ampere. One ampere is equal to 6.235 x 10^18 electrons (one coulomb) per second passing a given point in a circuit.

A measure of electron flow over time, used to measure battery capacity and state of charge. For example, a current of 1 amp drawn from a battery for 10 hours would result in 10 amp-hours of charge cycling through the battery.

An instrument that monitors electron flow over time. Amp-hours are the product of electron flow (in amperes) and time (in hours).

Generally refers to the maximum and minimum voltage attained by an alternating or pulsed current in each complete cycle or pulse of that current.

The angle between the sun’s rays and a line perpendicular to the active surface of a solar module or collector, in degrees.

The angle that a solar collector or PV module is positioned above horizontal.

( Battery ) The electrode within a battery cell that undergoes the chemical process of oxidation. Electrically, the anode is the cell's positive terminal.

(Water heater) An aluminum or magnesium sacrificial rod installed within steel tanks that is used to help prevent corrosion of the tank itself.

Any number of photovoltaic modules connected together electrically to provide a single electrical output.

American Wire Gauge, a set of standards in the U.S. specifying the diameter of wire. A higher number indicates smaller wire.

The angle between true south and a point on the horizon, measured in degrees east or west of true south.

Parts or components of a photovoltaic system other than the photovoltaic array or other generating equipment.

A circuit used to condition and stabilize an electric current, for example, in a fluorescent light.

The simplest of solar hot water systems. A tank of water within a glass-covered insulated enclosure aimed at the sun. Water is heated in the tank and then flows to the load or an auxiliary water heater.

Two or more electrochemical cells electrically interconnected in an appropriate series/parallel arrangement to provide the required operating voltage and capacity levels. Under common usage, the term battery also applies to a single cell if it constitutes the entire electrochemical storage system.

The total maximum charge, expressed in ampere-hours, that can be withdrawn from a cell or battery under a specific set of operating conditions including discharge rate, temperature, state of charge, age, and cutoff voltage.

The simplest operating unit in a storage battery. It consists of one or more positive electrodes or plates, electrolyte that permits ionic conduction, one or more negative electrodes or plates, separators between plates of opposite polarity, a container for all the above, and posts or other terminals for electrical connection.

The number of cycles, to a specified depth of discharge, that a cell or battery can undergo before failing to meet its specified capacity or efficiency performance criteria.

The period during which a cell or battery is capable of operating above a specified capacity or efficiency performance level. With lead-acid batteries, end-of-life is generally considered when a fully charged cell can deliver only 80 percent of its rated capacity. Beyond this state of aging, deterioration and loss of capacity begins to accelerate rapidly. Life may be measured in cycles or years, depending on the type of service for which the cell or battery is intended.

The theoretical maximum energy that a wind generator can extract from the wind—59.6 percent.

Any organic matter available on a renewable basis, including agricultural crops, wastes, and residues; wood, wood wastes, and residues; animal wastes and municipal wastes; and aquatic plants.

Biomass converted directly to energy or converted to liquid or gaseous fuels, such as ethanol, methane and hydrogen.

The energy-capturing, aerodynamically designed part of a wind turbine, which interacts directly with the wind.

A semiconductor connected in series with a solar-electric cell or cells and a storage battery to keep the battery from discharging through the cell when there is no output, or low output, from the solar cell. It can be thought of as a one-way valve that allows electrons to flow forwards, but not backwards.

Device for stopping a wind turbine. This can be an electric brake that shorts the output of the turbine (dynamic braking), or a mechanical brake that physically stops the rotation, as with a brake drum and shoe.

A manually operable switching device that also automatically opens a circuit in the event of overcurrent.

The amount of heat required to raise the temperature of one pound (one pint) of water, one degree Fahrenheit. 1 watt-hour = 3.413 BTU.

The initial phase of battery charging, when the largest amount of energy is put into the battery.

An electrical connection component that can accept multiple cables or wires. Also bus, bus bar, or busbar

A semiconductor device connected in parallel with a series block of parallel PV strings to prevent current from flowing back through any shaded or failed modules in the same block.

An electrical effect in AC circuits that results in amperage peaking before voltage.

The electrode within a battery cell that undergoes the chemical process of reduction. Electrically, the cathode is the negative terminal of the cell.

Systems that protect metal from corrosion by running small electrical currents along the metal. Most often used to protect well heads, and oil, gas, and water pipelines.

CELL (battery)
A single unit of an electro-chemical device capable of producing an electrical current by converting chemical energy into electrical energy. The cell is the basic unit used to store energy in the battery. The cell contains an anode, a cathode, and the electrolyte. A battery usually consists of several cells electrically connected together to produce higher voltages. (Sometimes the terms cell and battery are used interchangeably).

CELL (solar)
The smallest, basic photovoltaic device that generates electricity when exposed to light.

A component of photovoltaic systems that controls the charging of the battery to protect the batteries from overcharge and overdischarge. The charge controller may also indicate the system operational status. Standard charge controllers vary the current (A) based on preset voltage set points.

The current applied to a cell or battery to restore its available capacity, specified in relation to total battery size. A C/20 rate is a charge rate that is 1/20th of the total battery capacity. Also called a “20-hour rate.”

A group of electrical components that make a complete electrical path, providing some function.


A solar hot water system of which no part is vented to the atmosphere or fed with fresh liquid. The system liquid, usually some form of antifreeze solution, is recirculated. Closed loop solar systems are also known as glycol systems and indirect systems.

A traditional building technique using hand formed lumps of earth mixed with sand and straw.

The plumbing loop in a solar hot water system that includes the solar collectors. The collectors heat the fluid in the collector, and the heated fluid can be used directly (if water) or the heat can be exchanged to a potable water loop.

A box where wires from individual PV modules or strings are combined into larger wires to run to the battery bank. Can also contain overcurrent protection devices.

A smaller version of standard fluorescent lamps that can directly replace incandescent lights. CFLs use 65 to 80 percent less energy, while producing the same lumens.

A photovoltaic module that includes optical components, such as lenses, to direct and concentrate sunlight onto a solar cell of smaller area. Most concentrator arrays must directly face or track the sun.

Heat transfer from a hot object to a colder object through direct contact.

A material with relatively low resistance through which electricity will readily flow—wires, cables, busbars. The most common conductors are copper and aluminum.

Metal or plastic tubing designed to protect electrical conductors.

The maximum amount of power an inverter may deliver to a load (or loads) for a sustained period of time.


Heat transfer by the movement of fluid (usually air or water).

Heat transfer through either the natural or forced movement of air.

An electronic device for DC power that steps up voltage and steps down current proportionally (or vice-versa).

A type of PV cell made from a single crystal or polycrystalline slice of silicon.

Flow rate of electrons. See AMPERE.

Electrical equipment setting for the voltage level at which a battery is considered to be empty, and the discharge process is terminated. Most commonly found in inverters and charge controllers that include a feature for low voltage disconnection.


One complete charge/discharge cycle of a battery.

An AC sine wave’s movement from zero to maximum positive, through zero, to maximum negative, and back to zero.

Cycle life is the number of cycles a cell or battery will undergo before being considered “worn out.” This point is usually defined as when the battery’s capacity has decreased to 80 percent of its initial rated capacity.

The placement of windows and skylights to provide natural interior lighting and to reduce daytime electrical demand.

The number of consecutive days that a stand-alone renewable energy system will meet a defined load without additional energy input.

Direct current. A one-way flow of electrons. Typical sources of direct current are solar-electric cells, rectifiers, and direct current generators. To be used for typical 120 volt or 220 volt household appliances, DC must be converted to AC (alternating current).

High-technology motor used in centrifugal-type DC submersible pumps and other applications. The motor is filled with oil to keep water out. An electronic system is used to precisely alternate the current, causing the motor to spin.

The traditional DC motor, in which small carbon blocks called “brushes” conduct current into the spinning portion of the motor. They are used in many applications, including DC surface pumps and also in DC submersible diaphragm pumps. Brushes naturally wear down after years of use, and may be replaced.

A variable speed motor that uses permanent magnets instead of wound coils. Reduced voltage (in low sun) produces proportionally reduced speed, and causes no harm to the motor.

A battery designed to regularly discharge 50 to 80 percent of its capacity before recharging.

A quantitative index reflecting demand for energy to heat or cool buildings. Heating and cooling degree days show the difference between the mean daily temperature and a 65F base. The higher the heating degree days at any location, the colder the winter. The higher the cooling degree days at any location, the hotter the summer.

Difference in temperature.

The ampere-hours removed from a fully charged cell or battery, expressed as a percentage of rated capacity. For example, the removal of 25 ampere-hours from a fully charged 100 ampere-hour rated cell results in a 25 percent depth of discharge. Depth of discharge is the opposite of state of charge (SOC).

Domestic hot water: refers to any system that provides hot water for household use.

An electronic switch that turns off or on based on the difference between two temperatures. In a solar hot water system, the controller measures the temperature at the collector and compares it to the water temperature in a storage tank to turn the pump on or off.

A device with multiple electrical measurement capabilities, such as voltage, amperage, resistance, etc., commonly usable for both AC and DC circuits. It has a digital display.

A semiconductor device that allows electrical current in only one direction.

An electrical current that moves in one direction only.

In passive solar heating, a direct gain system relies on the sunshine to directly hit the substance or mass being heated. Direct gain systems used today usually rely on a layer(s) of glass to assist in holding the heat within a space where the heat is desirable.

The rate at which energy is being drained from a battery.

Switch gear used to connect or disconnect components in a system.

In relation to a wind turbine, the direction away from the source of wind. A downwind turbine has its blades on the downwind side of the tower.

A tube added to the outfall of a hydro turbine to increase energy production by taking advantage of the drop in the tailrace.

A solar hot water system that only fills the collector when the temperature differential is appropriate. The water that is circulated through the collectors is stored in a reservoir. Draining the collectors provides freeze protection.

A solar hot water system that uses a special draindown valve that redirects the collector fluid and drains it down when the collector system pump is not operating. These systems have been prone to failure and are not recommended.

The fraction of time a device or load actually uses energy in a unit of time. For example, a load that uses energy for 5 seconds out of every 10 seconds has a 50 percent duty cycle.

Synonymous with “ground.”

The ratio of power output of a photovoltaic cell to the incident power from the sun or simulated sun sources under specified standard insolation conditions. A solar cell that converts 1/10 of the sun's energy that strikes its surface to electricity has an efficiency of 10 percent.

The effectiveness of a device to convert energy from one form to another, or to transfer energy from one body to another. An electric pump that is 60 percent efficient converts 60 percent of the input energy into work—pumping water. The remaining 40 percent becomes waste heat.

Same as VOLTAGE.

The rate at which electrons flow through an electrical conductor, usually measured in amperes (amps).

Energy flow resulting from the flow of charged particles, such as electrons or ions.

The breaking down of a chemical compound into simpler compounds or elements by the passage of electricity through the chemical compound. Commonly used to describe the extraction of hydrogen (and oxygen) from water.

The fluid in a battery, which is the medium of ion transport within an electrochemical cell. It provides a path for electron transfer between the anode and cathode of a battery cell.

Magnetic radiation produced by a changing electrical current, such as alternating current (AC).

A negatively charged particle. The movement of electrons in an electrical conductor constitutes an electric current.

The energy consumed by all of the processes associated with the production of a material. This includes the energy required in mining, transport, manufacturing, administration, use, disposal, etc.

The amount of work that a system or entity can do (potential energy) or is doing (kinetic energy), measured in joules. The product of power and time, measured in watt-hours. 1,000 watt-hours = 1 kilowatt-hour (KWH).

A ratio of a battery or cell's capacity to either its volume or weight. Volumetric energy density is expressed in watt-hours per cubic inch. Weight energy density is expressed in watt-hours per pound.

A machine that converts energy into mechanical force or motion. Sources of energy include heat, chemical reaction, potential energy of elevated water, etc.

The process of restoring all cells in a battery to an equal state-of-charge. For lead-acid batteries, this is a charging process designed to bring all cells to 100 percent state-of-charge.

A continuation of normal battery charging, at a voltage level slightly higher than the normal end-of-charge voltage, in order to provide cell equalization within a battery.

The time when the sun crosses the plane of the earth's equator, making night and day of equal length all over the earth, occurring about March 21st and September 21st.

The process of a liquid changing its state into a gas when heat is added. In the most common occurrence on earth, water evaporation requires 970 BTUs per pound (pint).

In wind generators, this refers to an adjustment of the blades so that they catch less wind. This can prevent damage to the machine in high winds.

The final stage of battery charging, when the battery is charged at a slow rate over a long period of time.

Noticeable deformation of trees from prevailing winds. Flagging is an indication of an effective wind site. Lack of flagging is not necessarily an indication of a poor wind site.

A solar thermal collector that converts the sun’s radiation into heat on a flat surface. Does not use reflecting surfaces or lens arrangements to concentrate the sun’s energy.

A trickle charge to keep a battery fully charged at a safe voltage level with minimal gassing.

A battery operation in which the battery is normally connected to an external current source; for instance, a battery charger that supplies the battery load under normal conditions, while also providing enough energy input to the battery to make up for its internal losses, thus keeping the battery always at full charge and ready for service.

In hydro-electric terms, flow refers to the quantity of water supplied to a water source or exiting a nozzle per unit of time. Commonly measured in gallons per minute.

An electric lamp coated on its inner surface with phosphor and containing mercury vapor. When bombarded with electrons, the vapor emits ultraviolet light that causes the phosphor to emit visible light.

A type of reaction hydro-turbine used in low to medium heads. It consists of fixed vanes on a shaft. Water flows down through the vanes and out sideways.

A wind generator tower with no guy wires. This can be either a lattice tower or a monopole. Freestanding towers are the most expensive type of tower, requiring large excavations and large amounts of concrete.

Lost energy due to friction.

  In hydro systems, pipe sized too small can lead to serious friction losses.

  In any belt drive system, there will be some losses due to friction.

The full sun condition is the amount of power density received at the surface of the earth at noon on a clear day—about 1 KW per m^2, or 1 Sun. Lower levels of sunlight are often expressed as 0.5 sun or 0.1 sun.

Reducing a wind generator’s swept area to protect it from high winds. Common furling methods are to tilt the rotor (blades) up or sideways out of the wind, or to feather (twist) the blades to degrade the airfoil.

An electrical device that is designed to break a circuit by melting an internal conductor when the current in the circuit exceeds the maximum considered safe for the conductors or devices in the circuit.

The production of hydrogen and oxygen gas from one or more of the electrodes in the cells of a battery. Gassing commonly results from the electrolysis of water in the electrolyte during charging.

A device that converts mechanical energy into electrical energy.

A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air. Compare to HEAT PUMP.

Either of two different types of devices used with wind generator towers. With a tilt-up tower, it describes the lever that helps tilt the tower up. With a fixed tower, it describes a temporary crane used to raise tower sections or the wind generator.

GLYCOL (Propylene Glycol)
An antifreeze, heat transfer fluid that is circulated through closed loop solar hot water collectors.

A device that limits the output of another device, such as a wind generator.

Limiting the output of a device. In respect to small wind generators, governing normally happens through furling.

Transmission line network used to distribute electrical energy, generally by a commercial power utility.

Metallic contacts fused to the surface of a solar cell to provide a low resistance path for electrons to flow out to the cell interconnect wires.

A renewable energy system that is connected to the utility grid, selling excess energy back to the utility. Also called a utility-interactive system.

The connection of electrical components to the earth and/or each other for the purposes of dissipating static charge or protecting against a short circuit or lightning.

Unwanted current path to ground.

A photovoltaic (PV) rack designed to be installed on the ground or other flat surface.

A metal rod (typically 5/8 inch diameter) that is driven into the earth (typically 8 feet deep) and is electrically connected to the negative conductor and/or any metal parts, wiring enclosures, or conduit of an electrical circuit.

Steel cables that support a tower.

The difference in elevation between two parts of a liquid-based system. In hydro power, the difference between a source of water and the location at which the water from that source may be used (synonym: vertical drop). With pumps, the vertical distance the pump must move the water.

A flume or channel that feeds water into a hydro turbine.

A device that is used to transfer heat between fluids or gases through an intervening surface.

A device typically used for heating and cooling of buildings by drawing from or dissipating into the ambient temperature of air or water. When cooling, a heat pump works like a refrigerator. When heating, it also works like a fridge, except the heat produced is used to heat a space.

A medium or container to which heat flows. Thermal mass walls and floors in a passive solar home act as a heat sink during the day.

Heat is transferred from one substance or location to another by three methods—radiation, convection and conduction. The sun's rays are a good example of radiation; warm air rising is heat movement by convection; and touching a hot iron or frying pan with your hand is heat transfer by conduction.

Cycles per second. Generally refers to the number of complete cycles of the AC sine wave per second, or the frequency at which a radio or computer processor works.

Any electricity that is generated by the flow of water.

A device that converts hydrogen to DC electricity.

A hydrometer is an instrument for measuring the density of liquids in relation to the density of water. The hydrometer is used to indicate the state of charge
in lead-acid cells by measuring the specific gravity of the electrolyte.

A type of heating system where water is heated in a solar collector or boiler, and is pumped to heat exchangers or radiators in rooms. Radiant floor systems have a grid of tubing laid out in the floor for distributing the heat. Temperature of the space is controlled by regulating the flow and/or temperature of the circulating water.

A measure of the capacity to generate energy or do work. 1 horsepower = 746 watts.

An energy system consisting of two or more generating subsystems, such as the combination of a wind turbine or diesel generator and a photovoltaic system.

An electric lamp that is evacuated or filled with an inert gas and contains a filament (commonly tungsten). The filament emits visible light when heated to extreme temperatures by electric current through it. Incandescent lightbulbs are one of the most inefficient ways to light a home. They produce a great deal of heat along with the light, and use three to four times as much energy for the same light output as compact fluorescent lightbulbs.

A type of electric motor that requires a high surge to start, and a stable voltage supply, making it a challenge to run using a solar-electric system.

The amount of sunlight reaching an area. Usually expressed in watts per square meter.

In a hydro system, the structure that receives the water and feeds it into the penstock (pipeline). Usually incorporates screening or filtering to keep debris and aquatic life out of the system.

A device that converts DC electricity (anywhere from 12 to 600 VDC) to AC electricity (typically 120/240 VAC).

An electrically charged particle or molecule.


The graphical representation of the current versus the voltage of a photovoltaic cell, module, or array as the load is increased from zero voltage to maximum voltage, under standard test conditions.

A submerged pump mechanically activated by a rod extending above the well head to a reciprocating engine, motor or any other rotating device.

The standard unit of energy (SI). One joule equals one watt-second, and 3600 joules = one watt-hour.

One thousand watts.

One thousand watt-hours. Unit of energy used to perform work (energy and work are equivalent in units, energy being the potential value and work the achieved value).

Fuel equivalents: One barrel of crude oil contains roughly 1,700 KWH

One ton of coal contains roughly 7,500 KWH

One gallon of gasoline contains roughly 37 KWH

One cubic foot of natural gas contains 0.3 KWH

One ton of uranium ore contains 164 million KWH

1.34 horsepower-hours.

1 KWH = 3,400 BTU. Can be compared to 860 calories (food energy value).

A location's distance north or south of the equator measured in degrees.

A semiconductor device composed of a PN junction designed such that electrons cause visible light during their migration across the junction.

Devices that protect electronics from lightning-induced surges by carrying the charge to ground.

The voltage drop or energy loss due to the resistance of wire in an electrical circuit. See VOLTAGE DROP

An electronic circuit that matches PV output directly to a motor by converting unneeded voltage to higher usable current. Used in array-direct water pumping.

Refers to equipment that is powered by electricity. Usually expressed in terms of amperes or watts. Any device or appliance that uses energy (such as a light or pump).

Glass coated with layers of metal or metal oxide. The coating emits very little radiation in the long-wave (infrared) spectrum, which diminishes heat loss from the building interior, and reduces heat gain in hot weather.

A unit of measurement quantifying the amount of light emitted from a light source.

The number of degrees east or west of true south from magnetic south.

The point on a PV module’s voltage/amperage curve where the product of current and voltage is a maximum (measured in watts).

Electronically tracking the maximum power point of a PV module to achieve the highest possible output, by (in simplest terms) using surplus voltage to boost amperage.

Hydro-electric plants producing more than 100 watts and less than 2,000 watts.

The smallest nondivisible, self-contained, and environmentally protected physical structure housing interconnected photovoltaic cells and providing a single DC electrical output. Commonly called a “panel.”

A device that converts electrical energy into mechanical energy.


Any hydro plant that produces less than 100 watts.

A document that describes the legal standards for residential and commercial wiring practices with safety as the prime objective. Many U.S. jurisdictions base their wiring inspections on the NEC.

State by state legislation that requires utilities to purchase renewably produced electricity at the same price that they sell it, until a building's monthly or annual energy use is offset.

A reference voltage used to describe batteries, modules, or systems (for example, a 12 volt or 24 volt battery, module, or system).

The pointed piece farthest toward the wind on a wind generator, designed primarily for cosmetic purposes, but also protects the blade attachment points and generator from the weather.

The period of low energy demand, as opposed to maximum or peak demand.

Energy supplied during periods of relatively high system demands as specified by the utility.

The unit that quantifies a material's resistance to electron flow.

Basic formula defining the relationship between voltage, amperage, and resistance. Commonly stated as E = I x R, or Voltage = Amperage x Resistance.

When an electrical circuit is interrupted by breaking the path at one or more points, stopping the electrons from flowing. A light switch opens an electrical circuit when it turns off the light.

The maximum possible voltage across a PV array, module, or cell. The voltage across the terminals of a photovoltaic cell, module, or array with no load applied when the cell is exposed to standard insolation conditions, measured with a voltmeter.

A fresh water or "direct" solar hot water system, generally for use in freeze-free climates.

Placement according to the directions N, S, E, or W.

The emission of gasses by a material. See also GASSING.

Current that exceeds the rated current of the equipment or the ampacity of a conductor, resulting from overload, short circuit, or ground fault.

A safety fuse or breaker designed to open a circuit when an overcurrent occurs.

An electrical circuit with more than one possible path for electron flow. When wiring PV modules, this wiring configuration increases amperage (current), while voltage remains the same. Parallel wiring is positive to positive (+ to +) and negative to negative (- to -). Opposite of a series connection.

Any use of the sun's energy in a manner that is found in nature without the use of mechanical aid like pumps or fans. For example, heating a thermal mass (a concrete wall or slab, for instance) during the day with direct sunlight, and using the stored heat in that mass to warm a greenhouse or home at night.

The period of time it takes for an energy generating device or system to pay for itself in fuel savings.

The maximum load or electrical power draw occurring in a given period of time.

Operating point of the IV (current-voltage) curve for a photovoltaic cell or module where the product of the current value times the voltage value is a maximum. Also called the “maximum power point.”

The equivalent number of hours per day when solar irradiance averages 1,000 watts per meter squared.

A common impulse turbine runner—the wheel that receives the water, changing the pressure and flow of the water to circular motion to drive an alternator, generator, or machine. Pelton wheels (named after inventor Lester Pelton) are made with a series of cups or “buckets” cast onto a hub.

The pipe in a hydro system that carries the water from the intake to the turbine.

A device that consumes energy even when its switch is off, such as the digital clock on a VCR.

The actual (physical) particle unit of light, as the electron is a particle of electric charge. Solar-electric modules use photons to generate electricity. Photons not captured by the cell are either reflected, pass through the panel, or are converted to heat in the solar array.

A collection of solar modules connected in series, parallel, or series-parallel combination to provide greater voltage, current, or power than can be furnished by a single solar module. Solar-electric arrays can be designed to furnish any desired voltage, current, or power.

A device composed of specially prepared semiconductor material or material combinations exhibiting the ability to convert incident solar energy directly into electrical energy.

The phenomenon that occurs when photons, the particles in a beam of light, knock electrons loose from the atoms they strike. When this property of light is combined with the properties of semiconductors, electrons flow in one direction across a junction, setting up a voltage. With the addition of circuitry, electrons will flow and electrical energy will be available.

A PV module consists of series and/or parallel wired cells typically made from layered silicon crystals that convert light energy to DC electricity. The number of modules in a given system varies depending on the combined load being powered.

PIPE LOSS (Frictional head loss)
The amount of energy or pressure lost due to friction between a flowing liquid and the inside surface of a pipe.

The semiconductor junction in a photovoltaic cell that shunts electrons into a circuit. Electrons are bumped across this junction by photons (light particles).

A PV mount that is installed on the top or side of a pole usually set in concrete. Can be fixed or seasonally tilted.

A wafer of silicon with a multi-grained structure. All grains have the same atomic crystal lattice, however, each grain has a unique orientation in space, producing a unique reflection of light, resulting in a "patchy" mottled appearance. AKA multicrystalline cell.

A traditional building technique in which post and beam framing units are the basic load-bearing members. Post and beams may be of wood, structural steel, or concrete. In this system, there are fewer framing members, leaving more open space for in-fill. Often used in straw bale construction.

The rate of energy use or generation per unit time, measured in watts. 1 watt = 1 joule per second.

The ratio of real power (watts) to apparent power (volt-amps) in an AC circuit. Power factor describes the offset between voltage and amperage peaks in AC. 1 is called “unity” power factor, and is when voltage and amperage peak at the same time—they are then said to be “in phase.” Power factor is calculated by dividing W by VA.

The “push” behind liquid or gas in a tank, reservoir, or pipe. Water pressure is directly related to “head”—the height of the top of the water over the bottom. Every 2.31 feet of vertical head gives 1 psi (pound per square inch) of water pressure.

A primary cell is an electrochemical cell (battery) that cannot be recharged. The chemical process within the primary cell is only one way—discharge. When a primary cell is discharged it is discarded. Common flashlight batteries are primary cells; they are disposable batteries that should be avoided.


Varying the amount of DC energy sent to a load or other device by changing the length of time a pulse is left on compared to when it is off. The wider the pulse, the greater the energy transfer.

The Public Utility Regulatory Policies Act, passed in 1978. Requires utilities to purchase excess generation from small-scale generators. However, without net metering, this can amount to a fraction of retail prices.


Two or more photovoltaic modules wired in series or parallel.

The use of electricity directly from a photovoltaic array, without batteries or other electrical storage. Many solar water pumps work this way, using a tank to store water.


  The sun's energy that comes to earth in the form of direct, diffuse, and reflected rays.

  The transfer of heat through electromagnetic waves, without heating the air between objects.

A two-way radio system that enables use of a regular telephone but with radio instead of wires.

The manufacturer's specification for the amount of charge that may be stored in a battery, commonly expressed in amp-hours at a specific rate of discharge.

The manufacturer’s specification for power output of a generating device. In most cases, this is not the most accurate measure to look at, since it predicts output only for ideal circumstances.

The amount of energy per unit time that is being added to the battery. Rate of charge is commonly expressed as a ratio of the battery or cell’s rated capacity to charge duration in hours. Example: A C/20 rate on a 100 AH battery would be 5 amps, the capacity of the battery divided by 20.

A device that prevents overcharging of batteries by controlling the charge cycle, and usually adjustable to conform to specific battery needs. Regulators do not step the voltage down, but control the rate of charge so the battery stays at a specified voltage. Also called CHARGE CONTROLLER.

Flows of energy that are regenerative or virtually inexhaustible from natural ecological cycles. Most commonly includes solar (electric and thermal), biomass, geothermal, wind, tidal, wave, and hydro power sources.

Refers to how well a material conducts a flow of electrons, measured in ohms (Ω). Resistance is the property of materials to impede a flow of electrons through the material. All materials have some resistance. Those of low resistance are known as conductors, while those of high resistance are known as insulators. The unit used to measure resistance is the Ohm.

A device with a known amount of resistance used in electrical circuits.

The voltage of a fully charged cell or battery that is neither being charged or discharged.

RF (radio frequency)
Any radiation of a frequency that may be received or radiated by radios. Common usage: RF interference (RFI); refers to the interference of radio frequency radiation with the operation of devices or appliances such as radios, televisions, computers, etc.

Root mean square; defines a time averaged value of a varying sinusoidal parameter, such as AC voltage, amperage, or wattage. The square root of the average of the squares of a set of numbers.

A PV or solar collector rack intended to be installed on a roof. For PVs, its elevation angle can be fixed or seasonally adjustable.

The blades of a wind generator, shaped to spin when exposed to wind, harnessing the wind's energy.

The part of a hydro turbine that accepts the water and turns its energy into rotating motion.

The measure of a material's resistance to heat flow. The higher the R-value, the greater its insulating capabilities.

An incandescent lamp filled with halogen gas. Somewhat more efficient than standard incandescents.

Secondary cells are batteries (electrochemical cells) that are rechargeable. The chemical reaction within the secondary cell is reversible, allowing the cell to be recharged many times.

The tendency of all batteries to lose energy. Self-discharge represents energy lost to internal chemical reactions within the cell. This energy is not and cannot be used from the battery or cell’s output terminals.

SENSOR (Temperature)
Sensing device that changes its electrical resistance according to temperature. Used in the control system of a solar thermal system to measure collector and storage tank temperatures.

A wiring configuration used to increase voltage from more than one supply. Series wiring is positive to negative (+ to -) or negative to positive (- to +). Opposite of parallel connection. Series circuits have only one possible path for electron flow.

A device that prevents overcharging of a battery by disconnecting the charging source as the battery voltage approaches some upper limit.

A group of PV modules or batteries wired in series.

A circuit in which two source leads of opposite polarity or dissimilar potential are connected directly to each other with no regulation or load in between, allowing the full energy potential of the source to flow through the circuit. A short circuit will trip the breaker or fuse, and may damage components, or even cause a fire.

The current between two points in a circuit when the points are electrically connected with a conductor with essentially zero resistance. Normally applied to PV modules, which can be short circuited safely because they are limited current devices.

SHUNT (noun)
1. A resistive load through which electron flow is diverted, typically used to heat air or water.

2. A component with a precise, known resistance used to determine amperage by measuring the voltage across it and using Ohm's law (I = V/R).

SHUNT (verb)
To divert electrical current to a separate circuit or load.

A device that prevents overcharging of a battery by diverting some (or all) of the charging current to a resistive load when the battery voltage reaches a preset upper limit.

A PV mount installed on the side of a pole. May be fixed or seasonally adjustable.

A nonmetallic element, which when specially treated, is sensitive to light and capable of transforming light into electricity. Silicon is the basic material of most beach sand, and is the raw material used to manufacture most photovoltaic cells.

A wafer of silicon that has a perfect, continuous, crystal lattice (on the atomic level).

An estimation of a location for its potential for solar, hydro, or wind power.

A solar collector is a device designed to absorb incident solar radiation and to transfer the energy to the fluid or air passing through it.

A device that converts the sun's energy into heat energy, which is then used to cook food.



Energy coming directly from the Sun.

The longest and shortest days of the year. The longest day (Summer Solstice) is about June 21st in the Northern Hemisphere. The shortest day (Winter Solstice) is about December 21st in the Northern Hemisphere.

A system that operates independently of the utility lines. It may draw supplementary electricity from the utility, but is not capable of providing electricity to the utility.

The standardized conditions of 1,000 watts per meter squared of solar insolation at 25C (77F) for testing PV module ratings.

A ratio, expressed in percent, of the energy remaining in a battery in relation to its capacity when fully charged.


The movement of heat by convection in gasses and liquids causes heat to stratify in layers, the warmest being on top. Stratification is caused by gravity, since the warmer gases and liquids are less dense than the cooler layers.

A building technique using straw bales for the walls. See POST AND BEAM CONSTRUCTION.

A no-cavity solid building system of wall and roof panels "sandwiching" polystyrene insulation between an outer and inner sheathing panel (typically oriented strand board (OSB) or metal).

A material or energy source, which if managed carefully, will provide at current levels indefinitely.

The formation of lead-sulfate crystals on the plates of a lead-acid battery, which decreases battery capacity by impeding the opportunity for chemical reaction within a cell. Sulfation can be caused by leaving the battery in a discharged state for long periods of time.

The maximum amount of AC power an inverter may deliver to a load (or loads) for a short period of time, such as when starting a motor.

The area (in square feet or meters^2) that a wind generator’s rotor (blades) sweep. This is the collector area for a wind generator. The larger the collector, the more energy it will capture.

A device that breaks an electrical circuit, halting the flow of electrons through the circuit.

The part of a wind generator that makes the rotor face into the wind. Often the tail is also involved in governing the machine, by folding down or sideways to swing the rotor out of the wind.

The pipe, flume, or channel in a hydroelectric system that carries the water from the turbine runner back to the stream or river.

A material of low thermal conductivity placed in such a way as to reduce the flow of heat between two materials of high thermal conductivity.

A material that has the ability to absorb, store, and release heat energy. The more heat energy that is required to change the temperature of high-density materials (concrete, bricks, tiles), the more thermal mass the materials have.

Passive solar hot water systems that rely on the natural convection of liquids to collect energy. Designed with the tank above the collection surface.

A PV manufacturing technique where silicon is vapor deposited, a few molecules thick, onto another material.

A fixed angle measured from the horizontal to which a solar array is tilted. The tilt angle is chosen to maximize the array output. Depending upon latitude, season, and time of day, the optimum angle will vary.

A nonclimbable wind generator tower that tilts up and down to allow installation and servicing of the turbine on the ground. Normally these employ a gin pole—a horizontal lever arm that helps raise and lower the tower.


A mounting rack for a PV array that automatically tilts to follow the daily path of the sun through the sky. A “tracking array” will produce more energy through the course of the day than a “fixed array” (nontracking), particularly during the long days of summer. Some trackers are single-axis while others are dual-axis.

An electrical device that steps up voltage and steps down current proportionally (or vice-versa). Transformers work with AC only.

A large strainer at the input to a hydro system. Used to remove debris from the water before it enters the pipe.

An engine that produces rotary motion through reaction or impulse, or both, with moving fluid or gas. The resultant rotary motion is usually used to drive an alternator generator.

In hydroelectric systems, a type of impact hydro runner optimized for lower heads and higher volumes than a Pelton runner.

A power supply providing continuous, uninterruptible service—commonly used in telecommunications and computer networks.

In relation to a wind turbine, toward the wind. An upwind turbine has its blades on the upwind side of the tower.

Commercial electrical energy distribution system. Synonyms: Mains, Grid.


The volt is the unit used in the measurement of electromotive force (electrical “pressure”). A standard electrical definition of the volt is: an electromotive force of 1 volt is necessary to move a current of 1 ampere through a 1 Ω resistor. It is often also referred to as electrical potential difference or potential difference.

A measure of the force or "push" given the electrons in an electrical circuit; a measure of electrical potential. Analogy: pressure in a water pipe. AKA Potential.

Loss of voltage (electrical pressure) caused by the resistance in wire and electrical devices. Proper wire sizing will minimize voltage drop, particularly over long distances. Voltage drop is determined by four factors: wire size, current (amps), voltage, and length of wire. Water analogy: friction loss in pipe.

A way of naming a range of voltage to a standard. Example: A “12 volt nominal” system may operate in the range of 10 to 20 Volts. We call it “12 volts” for simplicity.


The voltage at which a photovoltaic module or array generates at the highest power (watts). A “12 volt nominal” PV module will typically have a peak power voltage of around 17 volts. A PV array-direct solar pump should reach this voltage in full sun conditions. In a higher voltage array, it will be a multiple of this voltage.

A device for measuring the voltage difference between any two points in an electrical circuit.

Unit of power. Power is the rate of generating or using energy. One watt is the power developed or dissipated in a one volt circuit in which there is a current of one ampere (6.28 million million electrons per second). Watts = amps X volts.

A unit of measurement quantifying an amount of energy used or generated. A load that consumes 1 watt for 10 hours uses 10 watt-hours.

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One Earth

~We The People promise~

Learn from our Mistakes.                                                   

Create Peace and Happiness.                                                                                                       

Interact with No Harm.                                                              

Teach through Kind Action.

                                                                Experience Wilderness Quiet.

                         Share Our Bliss, Dance and Song.

Build Green. Protect and Care.                                   

Recycle, Reuse and Create
Sustainable Systems.

Save Our Wild Earth,
Her Animals, Land,

Plants, Water and Air.

And further,

~We The People promise~

"We of the Green Artisan Communities,
join in spirit and in our street presence
with Bernie Sanders, non-corporate
Democratic members of Congress,
trade unions, senior groups, health
care activists and all those who
believe in a Green Earth economy
with social justice."

"To all corporate fascists, to the
corporate Republicans, to the
corporate Democrats and any
and all other1% privatizers,
Loudly, Clearly and Honorably:

We The People, will honorably,
never let you throw nearly 30
million of us off of health
insurance (no matter how lousy),
make massive cuts to Medicaid
and defund Planned Parenthood.
We The People demand
NIMA!!  (HR676)
It's all about Green Art & Music,
Mom Earth, People over profit
and getting along.

National Improved Medicare for A!!
"Is the Healing of the Nation!" - a Jahmin' Notion!"


Aloha Nui Loa

Lots of love

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