It depends on how much roof space (or yard space) you have, and how many panels you install. A good average system size is 24 panels, which in most cases is a PALLET of panels, which gets you the best pricing. My home has 24 panels on it. 20 of them are 230 watt panels and 4 are 240 watts, added at a later date.
My house faces South West, and I have two large hills on the East and West side that shade my roof for an hour and a half in the morning and an hour before sunset. All that considered, here’s what I just got from the electric company on my most recent bill. It tells the story. I have gas heat, so this is just for my electric usage, but that includes AC in the summer months!
I’ve been getting great results with the system I installed on our home in Newtown, Ohio. Lately it’s been pretty cool and the days are getting longer. My 20 panel system generates a maximum of 4.3 kilowatts of power and the days are now long enough to pass 30KW Hours in a single day! Sometimes when LENTICULAR clouds go over and CONCENTRATE the sun’s energy, the panels have gone as high as 4,500 watts! No matter how you slice it though, the solar is doing it’s job nicely, as you can see from the info sheet that the power comnpany sent out… it’s funny, the paragraph below the one shown says “you can STILL lower your bill farther!” I don’t think that’s possible!!