So, I'm trying to connect the BMS to the battery pack I just assembled. Battery voltage is OK (cells and total) but BMS is showing low voltage when the balance leads are connected.
And the same low voltage when B- is connected
Also, resistance över B- and P- when only balance is connected is infinite.
Any ideas where to start troubleshooting this? Maybe I'm missing some step that's not documented
Battery pack
4x LifePo4 cells
3.27 - 3,28V per cell
13,1 V total
BMS: HEYO 4S 100A
Aliexpress
Balance leads are connected and I measure increased voltage for each lead - which is correct.
Connected the balance connector to BMS and expected zero resistance between B- and P- on BMS (according to manual) - Fail
Measurements from B+ to BMS which is only connected through balance leads:
B+ to B- on BMS: 13,1 V
B+ to P1 on BMS: 3,12 V
This is the first time I connected the BMS. I've got two of them showing the same behaviour. They could of course be faulty but I figured I'd try some troubleshooting before contacting support (if there is any).
And the same low voltage when B- is connected
Also, resistance över B- and P- when only balance is connected is infinite.
Any ideas where to start troubleshooting this? Maybe I'm missing some step that's not documented
Battery pack
4x LifePo4 cells
3.27 - 3,28V per cell
13,1 V total
BMS: HEYO 4S 100A
Aliexpress
Balance leads are connected and I measure increased voltage for each lead - which is correct.
Connected the balance connector to BMS and expected zero resistance between B- and P- on BMS (according to manual) - Fail
Measurements from B+ to BMS which is only connected through balance leads:
B+ to B- on BMS: 13,1 V
B+ to P1 on BMS: 3,12 V
This is the first time I connected the BMS. I've got two of them showing the same behaviour. They could of course be faulty but I figured I'd try some troubleshooting before contacting support (if there is any).