Maybe this isn't a big issue and I can stay within a couple degrees. My plan for this is to just test and see what happens.This would make traditional tuning methods nearly impossible, especially if you want to keep tight temperature control. PID Tuning: The PID would change from having full power to 25% power at the flip of a switch.Is this a bad idea? Do you see any reason why this wouldn't work? Below are some of perceived pitfalls and ways I hope to overcome it. Position 1 is for 240V on Kettle 1, 120V on Kettle 2, the opposite for Position 2, and Position 0 is everything is off. See my wiring diagram attached and at the bottom, it is pretty straightforward. Once the boil is finished on Kettle 1, Kettle 2 would get the 240V to raise to a boil for the rest of the brew day. ![]() At mash out of Kettle 1, I would dough in on Kettle 2 and change the switch so Kettle 1 would have 240V again. Once I reach strike temperature on Kettle 1, I would change the switch to where now Kettle 2 is receiving 240V and Kettle 1 has 120V. My process would be to turn on the controller and have 240V going to Kettle 1 and 120V to Kettle 2 at the beginning of the day. I'm not mentioning parts of the circuit that aren't necessary to the question but there will be standard safety and control equipment like contactors, circuit breakers, GFCI protection, SSRs, etc. ![]() The 120VAC is not being broken off from 240VAC supply so I have full amperage available and balanced loading. The power being supplied to the panel will be from two sources: 30A, 240V and 20A, 120V. Obviously the best solution would just be to have a 50A service to supply power to it and I can run both kettles off of 240V but that isn't an option currently. My plan is to use a changeover switch like the below to select which kettle/element is receiving 240V and which is receiving 120V at any given time in the process. I have an idea that I haven't seen elsewhere but I can't imagine I'm the first to think of it or carry it out. I've been planning a DIY control panel for a Dual BIAB system (10 gallon batch, 15 gallon kettles) for some time now and am getting ever closer to making that a reality and I'm ordering components.
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