$6000 off grid whole house Solar System

flowerbug

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The thing I don’t understand is what happens for a hard freeze if you have pipes on the roof?.

up here you have to use a system that is more like a heat exchanger where the fluid in the system contains anti-freeze rated for the expected temperatures or you have what is called a drain back system which only runs when there is enough heat provided by the sun to make sure it doesn't freeze and the rest of the time it is empty so there is no risk of freezing damage. you could also probably have it set up so that there are heat sources that come on to keep it from freezing but that to me would use a lot more energy than you'd likely capture. we can go quite a long time here without any direct sunlight.
 
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