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if you mount the panel flat then it will never get full sun, it would instead be getting 7/10 of full sun and thus have 7/10 the output so your 200 watt panel would never put out more then 140 watts of power under perfect conditions.
there are charge controllers out there that do basically what you are asking, giving you a dump load when your battery is full, off the top of my head I don't have one to recommend but an isolator diode before the charge controller could work and be easy to rig up to split the power to the fan/heater.
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