Solar kiln supplemental heat

[Nebraska]

Randomly searching for solar panels to power my fans in the kiln I stumbled across this.

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This is a panel for a solar pool heater, I had never seen one before. It just turned some wheels and might be a good way to increase performance for solar kiln especially later in the year or in northern climates. It's built to circulate water as I gather but I would guess antifreeze and a radiator setup would work or maybe just air.  I hadn't seen a mention of these and just stuck this up here in case someone could use it.