Originally Posted by
Dave H
I'm still trying to follow this bit:
The reason why this setup isn’t very good is because the packs will discharge down to different levels. This is due to the flow of current, the current from one pack must flow ‘through’ the second pack meaning that the current sees virtually double the resistance of the first pack.
I have personally experienced this first hand many years before SMC published their article... I had no idea what caused one of my packs to prematurely swell... I had no IR meter, nor was I rotating the packs, but I definitely experienced premature LVC issues and all kinds of reliability issues when running packs in series for 10 min mains... no issues with 5 min quals, but 2x2S-5Ah in series was a disaster and 1x4S-5Ah gave me no issues.
I believe the extra wiring/connectors for series wiring is what causes the additional IR on the circuit, totally different from having a single pack wired internally, plus a single pack has matched cells where you can't possibly guarantee matched cells from 2 separate packs. Simply put, running packs in series is just a bad idea all the way around
