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I read all the time about BMS not having low temperature protection. Why not use a freeze stat off a HVAC system? You could wrap the capillary tube all around the cells and if an area gets cold, the circuit would open. https://s3.amazonaws.com/s3.supplyhouse.com/product_files/O16-263-install.pdf

I have been building 100Ah batteries with 45A Daly BMS's. Now, I can not find the 45A anymore. I have a 12 volt system in a boat that never pulls over 40 amps. Can I parallel 50A or 60A BMS's with the 45A units with identical batteries? I got a 50A Daly BMS today and it is way bigger than my 45A...