After several hardware failures, some head scratching, and pleas for help on HomeBrewTalk I think I've corrected my fermentation chamber dilemma. My first setup was using a single Sainsmart Relay to control the heating and cooling of my fermentation chamber. Every now and again I would experience a failure on the cooling circuit between the relay and my fridge. The relay would failed "closed" which would run my fridge indefinitely or until I happened to go into the garage and see my conical frosted over.
I learned on HBT (shout out to day_trippr, Lbussy, and hinkensj) that my compressor was probably drawing too much power (likely at start-up) and melting the internals of the relay which resulted in a permanently "closed" circuit. https://www.homebrewtalk.com/threads/howto-make-a-brewpi-fermentation-controller-for-cheap.466106/post-8898206 I've now updated my configuration to use an Inkbird SSR-40 to control the cooling circuit. The Inkbird is rated to handle the power needs of the compressor so we shouldn't be seeing anymore frozen beers.
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Jamie WeissHomebrewer, Recognized BJCP Judge, aspiring Certified Cicerone Archives
November 2023
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