03-02-11, 09:47 PM | #10 | |
Lex Parsimoniae
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,918
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Quote:
(that can handle your 24w load). If I wanted to power 24w 24/7, I would likely use a single panel 80-200w and a charge+load controller with a 115ah marine-RV battery. I would likely have to switch it back to the grid at times, depending on the size of the PV and the weather. That process could be made fully automatic. Anyways, the system should be able to run your load & simultaneously give you battery a full charge within about 4 hours of good sun. So, a good sized PV is required. It has to daily store enough watt-hours to run that 24w load all night long and then some. But whatever the size you pick, there is going to be cloudy days followed by more cloudy days, once in a while.. Have you checked all the Low-Hanging-Fruit? There might be some other place where you can save 24w.. CFL etc.. I pay a lot for my power, 21 cents per kWh.. 24 watts 24 hours would cost me, about 0.576 kwh x .21 = $0.12096 or $3.63 per month or $43.50 a year. LOL! I pay over $200 a year for the town newspaper! Really, how much do you pay a year for 24 watts? |
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