I am currently working through the monster Ca&S LFP battery thread; after a couple of weeks I am well over 1000 posts in. That’s maybe a third of the total.
So that no one else has to summarize the info I am making a wiki page on it. Bit of a mess right now, but here’s the takeaway for boondockers so far: If we
start with balanced cells; and
charge to 13.8v; and
have sub-C (“fractional C”) charge/discharge rates
then we don’t need a balancing BMS.
Regular charge controllers with configurable setpoints can work fine, Vabs would be 13.8v with a short a period as possible and “float” would be set to something lower than that (13.2 - 13.4v). LFP batteries don’t need or use a real float so the lower voltage basically stops charging.
In a typical day the bank would charge to 100% SoC when the sun comes up, stop charging, drop under normal house loads to ~80% SoC and hold there as long as the charger can support it.