Evapotron Powered by Solar and Wind

I modified my Gray-b-Gon aka ''Evapotron'' gray water evaporator to be powered by solar energy while the wind is insufficient. Testing on the Playa next week.
To build your own, wind powered Gray-B-Gon water evaporator check out this instructable made by the inventor, Larry Breed, for complete DIY instructions.
www.instructabl...
This page also provide various means of creating an evapotron.
www.evapotrons....

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Can you tell me what relay you're using to detect voltage from your aeronmeter? Thanks