[RE-wrenches] Paralleling different type LFP batteries

Zeke Yewdall zeke at darkforestsolar.com
Mon Jul 14 13:15:24 PDT 2025


I have a system that I am trying this on.  Both are 16 cell batteries
(obviously can't do a 15 cell in parallel with a 16 cell).  Two 300AH
ReLion/IronEdison batteries with failed BMS's, so I'm putting in a new
JKBMS on each of them.  Three older Fortress Evaults (one of which may also
have a failed BMS, trying to figure it out still).  All in open loop with
SolArk inverters in a self consumption system.  I will be putting a Victron
smartshunt on each of the five paralleled batteries, with a cerbo,  to
track charging and discharging of each of them and see what they do over
time.  Charge voltages of both of them should be close enough to be
compatible...    Will report back in a few months.

BTW, this is in a separate power shed where they cannot burn anything else
down.  I would never do an experiment like this in a house or building of
any value (the batteries themselves and the SolArk inverters are the only
thing of value in this shed).

Zeke
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