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The solution I ended up using based on the LTC6812 chips has an isolated bus (ISOSPI) for each 15s slave module and they connect to a master that also has isolated CAN.

Thanks. One problem with these per-cell systems is cost. The individual cell modules for these are 18.50EUR each x 120 = ~$2650 USD, which is about 1/2 the cost of the 35kWh battery pack it is attaching to. https://123electric.de/gb/123smartbms/18-123smartbms-g3-4s-single-cell-module.html

That's part of the plan. If I have good success with these I was going to build a larger battery at another site consisting of several Tesla Model 3/Y batteries and just center-tapping that and using the built-in BMS and perhaps even their charger, instead of the built-in charging circuits on...

Thanks. I was getting close to building my own boards based on the LTC6812, when I found this open-source project that also sells built hardware: https://www.ennoid.me/battery/bms-gen-1 I went ahead and purchased some boards and will probably make a few software tweaks for my particular...

Regarding the communications on these BMSes, I read the UART / RS-485 / CAN docs and I don't see any provision to change the addresses of individual BMS modules so that they can share a common communication bus, which is usually the point of RS-485 or CAN. Is there some undocumented way to do...

I have several APC Symmetra PX UPS racks (40kW each in N+1 configuration) that I am experimenting with using LiFePO4 battery systems instead of the SLA batteries these usually come with. I have been using one with A Pylontech PowerCube M1 with success, but now I'm starting to play around with...