Once you know how many kWh's you'll be making with the solar system. You can find out how much that is in dollar and cents. For example: In West Virginia Appalachian Power charges about 11.5 cents per kWhand $10 in fees. The sun hours for West Virginia are 4.25. So if I want to displace $50 on my $100 power bill; I'd take $50 divided by .115 to equal 434kWh's. According to the chart above that means I would need a 4,400 watt solar kit (estimated). West Virginia's electricity rates are lower than the rest of the US. So you'll need to find out how much you pay per kWh.
You should have a south facing roof. Southwest, southeast, or due south are all good. East and West facing roofs are also ok but just figure on throwing a couple extra panels into the system because you don't get as much production. North is a no-no.
If your unlucky enough to have a North facing only roof then you'll need to consider a pole mounted array or a ground mounted array.
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