I have moved my last post from https://nzmotorhome.co.nz/forum/viewtop ... 50&t=19930
Probably a more relevant thread for anyone searching.
Paralleling internal BMS managed battery packs concerns me a little.
If each pack can deliver 180A (continuous I hope). Parallel 2 packs.
Now draw let's say 250A. No issue provided the BMS ouput current levels are identical. Extremely unlikely.
At some point one BMS will trigger that mysterious only known by the designer low level alarm point and shut down.
The appliance(s) still want to draw 250A. What now? Does the now overloaded remaining mysterious BMS circuit calmly and safely shutdown, blow internal fuses or links, release smoke or self destruct
Hopefully the first option on each and every occasion.
Restrict draw to 180A and everything should be fine. Few existing 100-200Ah"plug in" LiFePO4 battery internal BMS devices can safely handle a continuous 180A though. Well the ones I have researched, Battle Born included. Victron users rejoice.
Our Sinopoly 300Ah LiFePO4 pack can safely deliver 1000A plus.