inverter capacity calculation

those numbers are about right.  i have been meaning to freshen up the calculators, but i can barely get through my vm and email.

anyway,

you dont have monthly usage of 100kW;that does not make sense.  It may be 100kWh, and I will make that assumption for the numbers below.

969w of solar x 4.13 sun hours average = 4000 watt-hours or 4kwh production daily

4kWh x 30 days in a month = 120 kwh per month

20% deration for module performance, inverter efficiency, voltage drop, etc.  it is an estimator, but that is where the numbers come from.  in this case that is just about right.

james - Alt-E staff

cool, no problem.

generally it is because of the tendency for modules to perform closer to ptc ratings, in the real world, which are typically 80% of STC as well as the other factors i mentioned.

thanks for the question and input,

james Alt-E staff