Maybe he means watt hours per day per watt of installed panels, i.e. a 1000 watt array might produce 3000 to 8000 watt-hours on a day of average sun?
Maybe he means watt hours per day per watt of installed panels, i.e. a 1000 watt array might produce 3000 to 8000 watt-hours on a day of average sun?