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Old 03-13-22, 11:22 PM   #7
Solar Mike
Helper EcoRenovator
 
Join Date: Apr 2010
Location: Wellington, New Zealand
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The simplest method here is to have a small 20w PV panel direct driving a small magnetic drive DC inline circulation pump; soon as the sun is strong enough to drive the pump then there is enough energy to heat your panels. Sun goes in (cloud) or at night then pump turns off.

No fancy controller needed.

Cheers
Mike
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