That depends on a couple of factors. First, where you are affects how much yearly average sun you get. In the US that can vary from a yearly average of about 4 to 6 hours per day. You will usually get more in summer, less in winter. Second, how much sun you get also depends on where the panels are, how much – if any – shade they might get during the day, and what angle and direction you can mount them at. To work best, solar panels should be aimed South, and tilted at around 15 to 40 degrees (again, depending on where you are). PV Watts solar electric calculator for grid tie systems. See the PV WATTS program to figure it out for you. This is an online calculator at NREL and gives you a pretty good estimate: http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/How much you use each month is the main variable. To find out, look at your electric bill. Someplace on there it tells you how many kilowatt hours you used for the month, and often gives a daily average. It will also tell you how much you are paying. To get the TRUE cost, divide your bill amount by how many KWH you used.
How to figure the cost for 100% solar power:
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