The energy E in kilowatt-hours (kWh) per day is equal to the power P in watts (W) times number of devices times number of usage hours per day t divided by 1000 watts per kilowatt:
E(kWh/day) = P(W)× n × t(h/day) / 1000(W/kW)
This Calculator is designed to calculate off-grid solar system size. For running AC, Water heater, Water pump we dont suggest to run on solar, as the solar system will cost 3-4 times higher than the normal one and requires high budget. So Those appliances are excluded from the list.