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

BrianPBrianP Registered Users Posts: 1
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?


  • mike95490mike95490 Solar Expert Posts: 9,244 ✭✭✭✭✭
    edited February 6 #2
    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.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

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