Hi Jason, can you let us know what the old battery is so we can dig up the specs and see if there would be any issues.
There are a few odd ball like simpliphi which while a 51.2v has a very narrow window for operation compared to most other prismatic cells. jay > On Jul 14, 2025, at 5:07 AM, Jason Szumlanski via RE-wrenches > <[email protected]> wrote: > > 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 > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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