The maps I see show somewhere just below 4 kWh/m^2/day for much of Pennsylvania. https://www.altestore.com/pages/solar-maps-for-the-usa https://www.altestore.c

The maps I see show somewhere just below 4 kWh/m^2/day for much of Pennsylvania. https://www.altestore.com/pages/solar-maps-for-the-usa https://www.altestore.com/pages/solar-maps-for-the-usa The desert southwest is only at most around 6 kWh/m^2/day, mind you. This is horizontal irradiation; a PV module tilted properly would receive more effective hours per day. Also, half the solar intensity for twice as long would enable inverters to be downsized, even if the average kWh/m^2/day were unchanged.