I will be capacity testing some new Lifepo batteries in the next couple weeks and was hoping to use my smart shunt to measure and capture results. The tests will run until the BMS shuts down the battery based on a low voltage cutoff (at the cell level, not the battery voltage).
I did a bench test last night and found that when I cut battery power, my smart shunt data/history is gone and I can't see the consumed ah's where the BMS disconnect happens.
I would think the data would persist somewhere, but I can't find it. Is there a way to write off the data to a permanent record somewhere since it appears to be wiped after power is cut? I don't care about capturing every single data point at the end, but would like to get a good idea of where it ended up before low voltage shutoff.
I was also trying to think of a way to power the shunt with a small current from a power supply separate from the battery, but I think that would skew the test and would cause a problem when the battery shuts down since the inverter would still be trying to pull a load when the battery shuts down.
Any thoughts? Thanks.
