[RE-wrenches] Different LFP Batteries in Parallel

[Jason Szumlanski]

There are never-ending videos on YouTube showing different brands and
capacities of LFP batteries working in parallel. I have never tried it
myself, and every instinct says don't do it, but I have a situation where
it would be very helpful.

I have a client with an older 60 kWh battery that is discontinued and
incompatible with any other battery from the same manufacturer. It has a
BMS with a 51.2 volt nominal rating. They need another 20 kWh of capacity.
It is too costly to scrap the existing battery and start over, and the
existing battery has been tested and confirmed to hold very close to its
rated capacity.

What is the real deal on mixing and matching? Is anyone doing this safely
and successfully? I wonder what the battery manufacturers say about it.

Jason Szumlanski
Florida Solar Design Group
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