Simple math. 3000 watt solar system; assume only 6 hours per day of useful solar activity means you are putting 18 kw/h of power into the grid per day. That's 540 kw/h per month.
By comparison, my bar fridge uses 60 watts at peak. So assuming it runs 50% of the time (which it runs far less), that is .72 kw/h per day or 22 kw/h per month. So it would only use 4% of my solar output.
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