Ok, so anyone got a TLDR; for how to use the leaf BMS from a 40kWh pack? One arrived today, I suspect I'm going to have to do some digging. I've read a lot so far but nothing super conclusive for my tired brain.
Can I just hook up 12V, Gnd, CanH and CanL and get data via a Bluetooth dongle and leafspy lite? Is there some documentation on which cells connect where on the BMS cabling?
evcar wrote: ↑Fri Jan 17, 2020 6:11 am
I 've attached the wiring diagram from the 2013 BMS that I used in my car.
Ok so this is a great start for wiring things up, although interestingly my LS11 connector has an extra wire that's not shown on this diagram on pin 11.
From Cor @ DIYElectricCar wrote:
The BMS cannot limit anything, it only measures voltage and current and it will balance the cells 24/7 as long as it receives +12V on pin 5 (BAT) of the round connector, which is wired to pin 12 of the LB11 connector.
Also, all 96 pairs of cells need to be plugged in obviously.
The BMS will only communicate when there is 12V on either IGN (pin 4 round connector, pin 6 or 7 of LB11, for old/new BMS) or CHG IGN (Charging) which is located on pin 21 or 31 (old/new battery type), pin 5 of LB11.
A question, will the BMS report voltage for just 1 cell for testing purposes? It would be nice to have it setup spitting out CAN and then connect cells one by one and see the voltages show up on leaf spy.