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Solar Power For My Home

Thomas Said:

Energy Conservation: How do I start solar powering my home? and living OFF the grid?

We Answered:

Take $50,000 - 100,000 out of your savings account, or borrow it if you can. Install a complete solar power system including photo-voltaic cells, batteries, inverters. Disconnect your house from the grid. Buy some back-up generators and/or kerosene lamps.

Kiss your money good buy, because you will never recover what you spent based on energy savings.

Karl Said:

I am interested in converting my home to solar power, suggestions?

We Answered:

Your best bet is to contact a local solar installer for a free quote, and they will supply specific answers to your questions, which depend a LOT on your location.

For tax and other incentive info, try:

http://www.dsireusa.org

and click on your state. The federal government will give you a 30% tax credit for solar electric, and something for solar hot water, too, I believe.

The time for return on investment varies from 2 years for solar hot water in Hawaii, to infinity (never pays back) in cloudy and cold climates.

There are over 100,000 solar roofs in California today, so clearly, some people think it makes financial sense.

Becky Said:

what do I need to get started to do solar power for my home?

We Answered:

OK - some rules of thumb:

10 watts per square foot, unless you go to amorphous-crystal cells - then you may get up to 15 watts per square foot.

Storage should be three times (3 x) the average load in your house. The average load may be calculated from your appliances, frequency of use, lighting load and heating load.

Your solar panels must be able to deliver at least 2 x your average load in order to actually store power as well as meet your needs.

Commercial installations less subsidies are typically $10/watt, fully installed + storage but including the inverter. Subsidies will cover most of this in some locations. So check your area.

So: if you have an electric stove, electric dryer, general lighting and a shop with various 20A motors, television, freezers, refrigerators and so forth - 50A max on the stove. 25A on the dryer, 25A on the water heater - allow 40A for everything else. comes to 140A peak - average (rule-of thumb) is about half that. 70A. You are a heavy electric user as compared to most individuals.

At 220V, that comes to 15,400 watts. Times two, and rounding comes to 30,000 watts of capacity required to meet 100% of your needs or 30KW. Roughly 3,000 square feet (30 square meters) of panels.

Battery Storage at using 100AH batteries comes to (working backwards and allowing a 15% inverter loss and not wanting to kill your batteries) - will require forty (40) 12V storage batteries in parallel.

And why it is that most installations are to supplement power only - and not replace 100% of the requirements.

You are looking at an unsubsidized cost of around $100,000 +/- if you do 100% of the labor yourself. About $8,000 in the storage system alone. And if you do this yourself, you will not get any subsidies.

Discuss It!

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