Why not using relay for A/B/C/D switch control ? about battery-emulator

[dalathegreat]

Battery agnostic precharge/contactor closing has been added to the software. https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24/blob/main/Software/Software.ino#L206

Still needs to be tested and documented!

[cyberjunky]

Just what I wanted to suggest, let the LilyGo handle the startup too!

[bobbo3]

We did some testing and on the battery we used the bit for LB_MainRelayOn_flag is always 0.
I changed the code temporarily so batteryAllowsContactorClosing = 1; and the precharge worked fine.
This was on an 30kWh battery.
Here is an screenshot on the relevant byte (3) from a log file.

I am not very familiar with Leaf battery and will appreciate if anyone has any ideas on what to test.

Edit:
The battery is reported as LEAF battery gen: 2
Here is some log of values:
__ OK __
Nissan LEAF battery selected
WAITING_FOR_BATTERY...
WAITING_FOR_BATTERY...
Precharge...
Negative...
Positive...
Precharge OFF...
BMS Status (3=OK): 3
Battery Idle
Power: 0
Max discharge power: 30000
Max charge power: 19000
SOH%: 9100
SOC% to Fronius: 4530
Temperature Min: 50
Temperature Max: 60
GIDS: 189
LEAF battery gen: 2
Min cell voltage: 0
Max cell voltage: 0
Cell deviation: 0
BMS Status (3=OK): 3
Battery Idle
Power: 0

[dalathegreat]

Thanks for testing @bobbo3 , you beat me to it! LB_MainRelayOn_flag wont be set to 1 unless both HV connectors are seated. Do you have both the big and the small seated?

[bobbo3]

Thank you! I think we shorted both interlocks - the drive one and the heater one... but it is possible that we may have missed something. I will double check.

[dalathegreat]

Closing this issue as completed, many are using automatic contactor control already! 🥳