Solar thermal performance on very cloudy day?

Dubman

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Joined
Nov 9, 2021
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Hi, I'm pondering a diy solar thermal panel drainback system installation.
My question is what happens in very cloudy or rainy weather? In the drainback system, I gather that the water pump turns on at a specific low water temperature, and off when it reaches a set hot temperature.
But on a really cloudy or rainy day, will the water finally get hot enough so that the circulating pump turns off, or would the pump just stay on all day? Thanks
 
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