How do I figure out how many solar panels are needed for off grid solar system?
look at your electric bill and see how many kilowatt hours ( kWh) you use a month
divide by 30 for daily use. Most people are in the 20kW a day range
So you need to put that much into a battery bank each day
the Dept of Energy has a calculator for how much usable sun a day you have where you live ( like say 8 hours a day year round in Key West, 3 hours a day average in Seattle)
4 hours a day? you need a 5 kW system...more is better for there are various losses and inefficiencies to deal with.......
panels: this would mean about 30 2x3 foot 175 watt panels; add wire, battery bank, inverters to take the 14 volt of the battery system back up to 1120 volt home use......add 10% for "stuff".......and then the labor for the carpenters roofers and electricians to put it all in, plans permits and gov regulations.....
and time and again the number always comes out to about $6.00 a Watt installed..
so for a 5,000 Watt system plan on $30,000.00
Payback Time for A Solar Panel System
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