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Hi,
Are you leaving off the "hour"? If a 1,000watt panel produces full power for 1 complete hour, then it is putting out 1kwh, right?
So for your 1.5kw array: if it works at 100% for 8 hours, that would be 12kwh. If it works at ~50% output for 3 hours in the morning and 2 hours in the evening, that would add 3.75kwh; making the total for the day 15.75kwh.
Around here (in New England) we pay ~19 cents per kwh, so this would be worth just shy of $3 per day; or ~$1,000 per year.
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