Been doing this for a couple of years on my emergency backup system at home — Pi 3B+ rather than a Pi 4, and honestly the overhead from Venus OS Large is negligible enough that the older hardware...
Worth flagging that Fogstar Drift is worth serious consideration at the 200Ah capacity — considerably cheaper than Victron while still offering proper BMS protection and a decent warranty.
Worth checking your cell balancing settings on the BMS itself — the BMV-712 will only show you what the shunt's measuring, and if your cells are drifting out of sync, voltage readings get all over...
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