you should ask. The system has worked nearly perfectly, excepting the fact that the CALB batteries don't work in winter temperatures here (near/sub freezing.) I've had two incidents with the system worth mentioning thus far.
One was when the protection bypass was engaged and something was left on during the winter while the boat
was put away. Checked the voltage in the spring and the bank was 2.0V! Two cells were sub 0.03V if I recall
correctly. This bank had been bottom balanced, though, and I warmed up the cells and put them on a trickle charge (1A, IIRC) until they got back up in normal voltage ranges. Fortunately, I kept detailed notes on charge and discharge cycles from when I first got the batteries. I duplicated these conditions and found no diminished capacity, which still amazes me.
Just the other day, I had disconnected the positive lead from the bank while replacing the water
pump which required removing the house alternator. I did this because the alternator wiring
bypasses the battery
switch. However, our inverter
also bypasses the battery switch and I didn't shut off the inverter's independent circuit breaker. I think the inverter
has a bit of capacitance in it which caused a bit of a spark that I believe fried the cell board on the most positive cell. As my BMS doesn't control LVD, I simply unplugged this BMS power to turn off the alarm
and everything worked. Unfortunately, I left the shorted cell board on the battery and it proceeded to drain that cell ~80% over the next two days. On the plus side, the Prolatch LVD worked and turned off the power even though I had no cell level monitoring. Battery level monitoring does work for 12V systems if the LVD and HVD limits are more conservative. I would never recommend it for a 24V system though as the math doesn't work. In this case, 3 cells were at 3.3V and the drained cell was at ~2.4V or so. Of course, the Prolatch couldn't protect the cell from the cell board on it.
Now, I've removed the BMS. Temporarily or permanently remains to be decided. Without the BMS, I lose overcharge protection and one of my low voltage alarms and cell level alarms, but I'm less concerned about that at the moment as we only have alternator charging
and I monitor
things pretty closely when the engine
is running. I'm confident the Prolatch LVD will protect the cells from over-discharge and am shifting to top balancing the pack as I believe that will greatly extend its life (provided I never bypass the Prolatch and accidentally run it down to 2V again
Other than that, the pack has been amazing. We have far more usable capacity with 100Ah of LiFePO4
than we had with 200Ah of AGM
and we can charge much, much faster. We've also gained a ton of stowage as a result and reduced our weight aboard.