I know nothing about panels, but i know my watts... and that statement makes no sense. Producing 1 watt for 1 hour is 1Wh. Producing 1000W for 1hr is 1kWh.
I assume that panels are at peak efficiency when perpendicular to the sun... so you won't produce peak power for the entire daylight time.... 8hrs is probably a good estimate, if that's what you were doing (unless you only get 8hrs of sunlight due to living in a valley)
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