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  1. 65nw

    Tesla Module BMS Balance: lowest cells first, jumping values

    Tesla 5.3kwh module with SimpBMS REV A module board, says "PCBA, BMB, WIRE-CLIP" When simpBMS put the pack in balance mode, the lowest two cells begin to jump up and down. After letting it balance the cell for ~10 minutes, cell 11 (the lowest) went from 3.05 to 3.01 indicating the balancer is...
  2. 65nw

    Cell Tower Batteries- Info

    ah that's super good to know. It makes sense they would be purpose built and then dumped by the telecom companies after they are pulled from service. Under sizing the load and keeping a high cut off voltage might get a little more use out of them. perhaps
  3. 65nw

    Cell Tower Batteries- Info

    Nice score, craneplaneguy! sounds like these are pretty great to have around. Will certainly work them into some projects here. Jon NCal, I finally got some time to do a little work on these and setup an arduino with voltage dividers to track cell voltages. Working on the serial -> excel part...
  4. 65nw

    Cell Tower Batteries- Info

    images
  5. 65nw

    Cell Tower Batteries- Info

    I came across these at a friend's shop and wonder if anyone has experience with them they can share. I get about 1.3v per cell but have not load tested or tried charging. I found the manual for a similar model but these are discontinued. They came out of a backup power system in a cell tower...
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