Energy

Energy

Geodesic Quonset: Inexpensive, Easy DIY Shelter

Geodesic Quonset
Geodesic Quonset

Many folks are familiar with the concept of a Geodesic Dome, and the great advantages of strength and minimal materials,

Geodesic Dome
Geodesic Dome

but most have not heard of a Geodesic Quonset, that also brings along many of the same advantages. It’s great for connecting domes, standalone as an emergency shelter, garage, or greenhouse. We built one recently, with a length of 60′, a width of 15′, and a pre-sidewall height of 7.5′. Less than 100 man hours to build, and a materials cost of less than $500 (plastic sheathing) , it’s extremely strong and functional. We built this structure using new 1″x6″ green lumber (1″x4″ was originally specified), but since all the pieces are less than 4′ in length, waste/scrap or recycled lumber would be ideal. All the pieces were screwed together using a power screwdriver and 3″ wood screws, 5 to a connection.…

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Battery Maintenance

PV panels only provide power when the sun is shining and wind generators only produce when there is sufficient wind, which can be less than 25% of the day. Typically we store power during times of generation in battery packs for use when no generation is possible. In order to keep those batteries at peak performance, and provide long service life, a regimen of maintenance must be observed.

The main things to remember when keeping your batteries in trim is cleanliness of the terminals, proper water levels, and not discharging below the recommended minimums, which in our case is 50%. Proper charging is also important. The best “manual” I have found describing the technologies and methods of care is Bill Darden’s Battery FAQ. There is a section on sulfation, a common battery killer in improperly maintained batteries. A recently purported cure for sulfation can be found at https://www.batterylifesaver.com/. The inventor claims that by dissolving sulfate crystals, he can increase battery life and perfomance.…

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Energy

Moira Cruickshanks
Moira Cruickshanks Geothermal Q&A

Moira Cruickshanks of Imperial College London Engineering Department answers your questions on Geothermal Energy next week in our forum. Here she introduces ways you can use Geothermal Energy.

Post your questions for Moira in the Off-Grid Forum.

Geothermal energy is heat from the Earth. On a large scale, geothermal power plants generate electricity using naturally heated groundwater and steam from deep in the ground to turn turbines.

But we can also use geothermal on a small scale to heat our homes, schools and offices, although it is not yet an off-grid technology. If you want to supplement your grid energy with a renewable off-grid supply, either taking advantage of natural hotspots in the Earth or using the constant temperature of the planet to regulate interior temperatures, you will need to make an initial investment in the technology, and the scale is more for a community than a single home.

It is not quite as easy as plugging a wire into the earth and then lying back and toasting your toes but almost. Go to our Forum to ask questions and get answers on installing Geothermal: https://off-grid.net/index.php?cat=30…

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Energy

Beanz meanz Biofuels

Alcohol Still
Alcohol Still

Ethanol is produced from starch-based grains, including corn, barley, grass straw and fast growing poplar trees, and is a replacement or additive for gasoline. Ethanol is made using a process called fermentation.

Biodiesel Powered Bus
Biodiesel Powered Bus

Bio-diesel, a clean burning, renewable diesel fuel substitute or additive, can be made from oil-seed crops, animal fat or vegetable oil. In the US, farmers grow mostly soybeans for bio-diesel, but canola or mustard seed are also viable feed stocks. Used fryer oil can replace about 5% of the diesel fuel used in transportation. Bio-diesel is made by chemically reacting lye and methanol with the animal or vegetable based oils and fats.

More info:

Planting the biofuel seed

Bio-fuel Tutorials

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Energy

Geothermal Heating, Cooling & Hot Water

From https://www.hydrodelta.com/:

Horizontal Loop GSHP
Horizontal Loop GSHP

Anyone who has a refrigerator

or air conditioner is already familiar with the operation of a geothermal heat pump. Contrary to common belief, cold is not something that is produced, but is a condition that results when heat has been removed. If you remember your high school physics class, you know that heat is produced by a molecular motion. All substances are made up of tiny molecules that are in a state of rapid motion. As the temperature of a substance is increased, the molecular motion increases, and as the temperature decreases, the molecular motion decreases. Molecules move faster on a warm surface than on a cool surface. Heat will flow from a warm substance to a cool substance. Reminder: Second Law of Thermodynamics.

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Energy

EVs PHEVs and Hybrids

Don McGrath's Sparrow
Don McGrath’s Sparrow

Welcome to the new age of Greener vehicles.

Time was, electric vehicles were promoted as the zero emissions saviours of the future, but the distance they could travel before recharging, and long recharge times led searchers to the hybrid vehicle, combining the advantages of a quiet, zero-emissions electric motor, with the range extending and battery charging capability of a small engine. This seemed to promise a solution, but effective mpg gains weren’t much better than a efficient diesel, batteries were expensive and emissions were still dirty.

Enter the Plug-in Hybrid Electric Vehicle (PHEV), a hybrid engine-electric, with the ability to plug in for recharging, cleaner point of use for electric only short trips, and long range capability. Combined with a efficient diesel, and clean burning biodiesel or vegetable oil, this could be the solution the automotive industry has been looking for. For more info, see the following sites:

Alternative Fuel Cars: Plug-In Hybrids and Electric Cars

Hybrids? Some opt to go all-electric

Plug-In Hybrids: State Of Play, History & Players

Plug-In Hybrid Electric Light-Duty Vehicle Research Project (PDF)

How Electric Cars Work

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dessin_sentierseng-2515140
Energy

Waterpower 101

dessin_sentierseng-2515140
MicroHydro Generator

If your homestead can take advantage of water sources to produce electricity, then you have come to the right place. Here are the ins and outs of water-powered electrical production, from the microhydro web site. The link at the end takes you to the site for more info.

Water poweris as old as civilization . If you live in an old mill or have an upland stream flowing through or close to your property, you probably have a site suitable to generate some or all your domestic power requirements. If there is insufficient power for your needs electrically,you might still be able to use water power to drive a water source heat pump.

The main power requirements are in the winter months, so there should be little or no conflict with other river demands. Adequate provisions may have to be made for migratory fish, and if construction is needed, take care not to dam up the area. Check land drainage upstream of your intake. Construct all schemes in an unobtrusive and environmentally sensitive manner, and where appropriate buy drawings of proven designs.…

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Energy

Photo-Voltaics (PV)

Burbank Resident Robert Beher on the roof with his 2 kW solar PV system
Burbank Resident Robert Beher on the roof with his 2 kW solar PV system

Here on our off-grid homestead, we use PV panels as part of our energy solution. PV takes the energy in the sun’s light, and converts it directly to DC electricity for battery charging. A inverter then takes the low voltage DC, and converts it to 120vac house current. In other countries, it may be converted to 220vac. The number of PV panels you need is determined by your electrical usage, and the part of the world you live in. We get 2.5 full sun hours a day, another area might get 6, so they would need fewer panels than we do for the same load. A good beginner’s tutorial can be found here . It’s a PDF, and requires Adobe Acrobat.…

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Energy

Convert your gas car to electric

Electric Car conversion
Electric Car conversion

Victor Tikhonov converted a Honda from gasoline to DC Electric. A few years later, he upgraded it to a AC Electric propulsion system. Everything he modified, from removing the engine, installing the electric motor, control and instrumentation systems, adapting existing accessories, to performance testing is laid out for all to observe, and hopefully replicate with their own vehicles. Since electricity can be generated with solar panels and wind generators, a electric vehicle is an appropriate addition to the off-grid home.

The Conversion

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Energy

Building your own Wind Generator

The payback time for wind generators is still too high. At otherpower.com you can learn to build your own wind turbine, reducing the cost and the payback time.…

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Energy

Installing a wood stove

Ancient Kalamazoo Franklin
Ancient Kalamazoo Franklin

We had a very old Kalamazoo Franklin wood stove that was coming apart at the seams, literally. The final straw was this week when the cast iron chimney elbow separated from the firebox. We decided that it needed to be replaced, and in a hurry. Out door Temps were -10F, and heading to -22F, so a new Vestal Classic stove was ordered and delivered.

New Vestal Classic
New Vestal Classic

I removed the old 26 gauge 7″ galvanized chimney pipe, and replaced it with new 22 gauge 6″ black chimney pipe. My fingers went right through the old pipe. As soon as I unhooked the chimney, the stove elbow fell completely off. This was a disaster waiting for an opportunity. I connected the new pipe, screwed it together, connected the new stove, and lit a fire. Soon the heat was again warming our home. My wife set a rocking chair in front, and enjoyed some well needed “me” time, and the cats curled up on the hearth, and took a nap. Life is good, and warm, again. …

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Energy

Solar Heated Water

Solar Water Heater
Solar Water Heater

Good ol’ John Canivan – guru of sun heated water systems, related the following to me:

In 1970 a friend of mine left the civilized comforts of a New Jersey home to seek out and experience the free, wild wilderness of an Adirondack hilltop in upstate New York. Jake loved the country life and swore that he’d never leave his mountain retreat. He endured the cold winters without electricity and baseboard heating, but Jake still missed running hot water. When spring came he took a 300-foot coil of black plastic tubing and connected one end to a spring high up on the mountain. He draped the remainder of the 300-foot coil on his roof and spread it out to cover as much surface area as possible. For a $50 investment and one hour’s worth of labor Jake had himself a bonafide hot water shower. He made good use of it whenever the sun was high on the mountain. I used it a few times myself. It works. The roof might look a little funny and the hot water would sometimes run out sooner than you’d like, but it did work when the sun was shining.

John has a practical tutorial on the how’s and why’s of sun heated water on his website.…

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