> Yes, on a ternary lithium cell (NMC etc), you should > consider it "done" if it ever drops below 2v
Phil, it was because of your prior warning about the consequences of allowing a cell to get below 2 volts that I parked the tractor and stopped topping up that pair of cells that had the high self-discharge rate. I had seen the cell voltage below 2 volts a time or two, and used to use a car battery charger and a Variac to balance the cell voltage with the rest in the pack before each use, all the while telling myself that I needed to find out why this was happening.
The most obvious problem was that I was seeing only about half the useable ampere-hours out of the pack, about 50Ah, instead of the 100+ that I would expect given that it was a 2P5S setup that should have doubled the available energy. I load/capacity tested all the modules before I built the pack, all came in at 50Ah or better. Only took one bad cell to knock the storage capacity in half, and apparently this happened after I assembled and installed the battery.
Hopefully all in the past once I reassemble and charge. _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/ OT: If you use an Android device, please read https://keepandroidopen.org/
