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You can size your solar array in just two easy steps! (Well, okay, there's a little research involved, too.) To estimate the size of your solar array, you'll need to know: # The number of Watt-hours (Wh) you plan to produce in one day. # The insolation value at your location. I have found this website to offer the easiest way to find out How Many Solar Panels do you need in your Solar Array?

http://howto.altestore.com/Library-Articles/Solar-Electric-Power-or-PV-Systems/How-Many-Solar-Panels-do-you-need-in-your-Solar-Array/a88/

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