Surgery to split Tesla Model 3, 23S46P, ~92V Module to 11S + 12S modules

BrianP · February 2021

I have 3, Tesla Model 3 battery Modules, 3/4 of a full battery pack (1, 25S sold). The problem is that it hard to get 96V inverters. Sigineer makes a 96V, 15kW but they are constantly "Out of Stock". 48V equipment is much more common.

Does anybody know how feasible it would be to cut the serial line in half on a 92V, 23S module and solder in new wiring to essentially split it into one 11S and one 12S.

A suitable 1S46P battery could be placed in series with the 11S to make a 12S. Perhaps even cleaved from the 25S and grafted onto the 11S to make 2, 12S modules.

23S 11S 12S
|-----------------------| => |-----------| |------------|

I have 2 of the 23S modules and 1 of the 25S modules.

One other question; What would an off-the-shelf 12S BMS do with either an 11S or a 13S module?

mike95490 · February 2021

NEVER solder to Li battery terminals. If not bolt on, you use spot welded nickel ribbon. Spot welding is the tricky part.

Soldering requires a lot of heat, and that heat transmits through the terminal and damages the battery seals. A quick spot weld does not raise the temperature.

Surgery to split Tesla Model 3, 23S46P, ~92V Module to 11S + 12S modules

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