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Controlling humidity in a motorhome

I am hoping to use sonoff sv to control 2 12v fans and low energy heater/defogger in my van conversion to circulate air and avoid damp. Sonoff th would be perfect but I will only have a 12v leisure battery to pull from (all be it a big one). I I was thinking of using ifttt but can't find another smart sensors to run off dc. Does anyone have a solution to this?
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