If i would invest for solar energy i would do where i can make most out of it and as substitute with backup, for example on lights and fans etc where i will get considerable benefit out of the system , another thing is where i dont get effected if it doesnot work , as substitute backup , suppose if batteries dont charge in winters or in cloudy days , the pump will stop, so he shud atleast have main line available, and use it as backup . im not against it but my point is , if u wana save money , do where its best .Solar is great! We've been in it since it was really expensive and it's relatively cheap now. If you have a pump that uses 50 watts continuous for 24 hours, that's 1200 watt/hours, about 100 amp/hours @ 12V. My 1200GPH pump uses about 35 watts. You would need a deep cycle, (not car battery) of twice that capacity, or about 200 amp hours (golf cart batteries are a good cost effective route). You should never discharge them more than 50% if you want them to last a few years or more. I'd guess you could get by with a couple 160 watt, 12 volt panels, a cheap charge controller and a 400 watt or less inverter. The best place I've found for panels is Solar Blvd
I've been dealing with them for about 10 years now and never been disappointed. They have Solar Cynergy 160 watt, 12volt panels for $125 each + shipping. The charge controller can be bought on Ebay for about $30 and the same for a small inverter to run a 120 Volt pump.
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