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Determining Initial System Size
So in order to get a rough idea of the size system we need to offset 100% of your electricity needs,
you simply divide your average daily kWh usage by the number of Peak Sun Hours. Continuing on with
our Flagstaff example:
Average daily usage: 26.3 kWh
Average Peak Sun Hours: 5.6 Hours
26.3 kWh รท 5.6 Hours = 4.7 kW or 4,700 Watts
Remember that this calculation does not factor in equipment efficiency, so our final system size
will need to be a little larger (10-20%). So if our equipment were 100% efficient, then a 4,700
watt array would require approximately 27 modules of 175 watts each:
27 x 175 watts = 4,725 watts
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