How to Calculate Solar Panel Output start by determining the panel’s wattage (in watts) and the average number of sunlight hours it receives each day. Multiply the two values to get daily energy production in watt-hours (Wh). For example, a 300-watt panel receiving 5 hours of sunlight will produce 1,500 Wh or 1.5 kWh per day (300 x 5 = 1,500). To convert this into kilowatt-hours, simp... https://solarsme.com/solar-panel-output-how-much-electricity-can-you-generate/