I am an engineer with a car background and some 10 years experience in EV driving but new to technical BMS details.
Now I want to install a used Nissan Leaf 40kWh 2018 pack as a battery backup for my PV installation based on this work from Dala: https://github.com/dalathegreat/BYD-Bat ... -For-Gen24
I just received the pack with zero physical damage and now would like to test the interior to provide feedback to the seller. If possible I would not like to open it. The seller showed me in a video, that the battery was working and was in good condition when it was still installed in the car.
After having wired up all the required connections, I attached an old ATX Computer power supply for the 12V as well as a Bluetooth ODB2 dongle with LeafSpy Pro. The connection to the dongle works, but I cannot get the CAN to working (CAN Bus error) and I am not even sure if the BMS itself is live.
I checked the wiring including the one to the ODB2 connector already 3 times.
Is there anybody who could help me with some hints here?
The wiring diagramm: My first questions:
- Does the emergency disconnector need to be in to test BMS? Not according to what I see on the wiring diagram.
- Same question for the 3 Relais (Pre Charge, Main Rly 1 and 2
- I have PIN 4 (IGN) and PIN 5 (BAT) on constant 12 V. How about PIN 31 (CHG IGN)? Does this one only need 12V when charging?
Thanks a lot
Heinz