You have a diesel heater in your install? Does that generally keep the battery ambient temp warm enough? Or do you also have a heater specifically for the battery?
I was thinking I might have to add a heating pad and thermostat. I can get both of those very cheap off Amazon — something like $30 for the whole lot. I’ll test and see if I can get by without it once the temps start to drop…if not, I’ll rig something up. I like how you mentioned siphoning heat from the interior to keep it warm. The diesel heater will be pulling air from inside, so I assume that the air in the battery compartment will gradually warm!
One weird thing: inside my BMS config file it mentions “total capacity” and “total cycle capacity.” I have the former set at 105000 mAh (for my 105AH cells) but the BMS default is “80,000 mAh” for “total cycle capacity.” Should that be left that way?
I set my high voltage cutoff for each cell at 3.65 (that’s what the data from the manufacturer said was the max charge voltage) and the low at 2.5 (again manufacturer spec). Any reason to change any of those numbers to something else? When I changed capacity to 105 AH (UP from 100) and raised the cell max charge from 3.4V (default) to 3.65, somehow the BMS jumped from 47% SOC to estimating 95% SOC! That’s confusing me a lot. Pack voltage is only 13.35V and VictronConnect reports charge voltage is only 13.66V. Ideas?
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