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Old 12-31-20, 11:22 PM   #19
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Ok, so with your setup and goals in mind, I would recommend a smallish hot loop with glycol, non-drainback. Maybe 15 to 20 gallons max to go to and from the collector. Either a brazed plate heat exchanger or a custom coil in tank jobbie. Secondary loop going to your slab or whatever radiant heating setup through a mixing valve, both discharging to a warm water heat store. If you have enough sun power, the warm water tank could dump the extra heat out into a supermassive underground cavern.

Controlling it just depends on what you are comfortable with. Electronic stuff is cheap enough nowadays that it's easy to browse the web and find a suitable plug and play setup for cheap. That being said, if you're a professional engineer capable of conjuring code, have fun.
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