The 20% seems low for what I read. Never did it. And couldn't measure it either.
Not sure about the heat build up.
"not using a single watt"
Maybe Ed's style simple shunt to a dump heater?
Like 160W, x 5 hours, x 150%. Thats like a space heater for 1 hour a day.
Maybe a 12V CFL or 2 from a single wire from the batteries?
In the most used lamps in the house.
Maybe charge the cell phones, LED lights, and drill batteries?
Thats mostly what I do with my wind power. :-/
Feels nice just the same.
G-
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