update on combined LFP bank

The combined bank (280Ah + 100Ah) has been functioning well. Solar harvest with the just the main array is just breaking even daily on charge so the bank hasn’t reached 100% SoC yet. This is with one meal a day cooked over propane instead of 100% electric. I do it at breakfast so the propane also helps heat the van up.
Cell imbalance on the long-dormant 100Ah was my main concern. I’ve got an active balancer on the way from Amazon but the JBD BMS’ passive balancing is making (slow) progress.

I am optimistic there is no permanent damage to the prismatic cells since the lowest-cell and highest-cell pattern has been broken. Now it’s almost random which ones are high and which are low. I think part of this is because charging on the smaller batt is so gentle; it’s only seeing ~1/4 of the current because it’s ~1/4 of the total Ah.

I read a comment from a clueful user on Will’s DIY Solar Forum that suggested passive balancing will typically succeed once the delta at ≥13.6v is ≤50mV. We shall see.

observations

Dec 2: It’s now holding single-digit mV deltas up to 13.51v. The deep winter sun can’t push the bank much higher than that so it’s hard to tell how far out of whack it will be in the upper knee.