Chargery BMS, DCC (Solid State Contactor) thread.

[Johannlog]

That's it! Thanks so much. It was at 250a I set it to 300a

So my BMS seems to be tripping off because of cell voltage difference again… it is exceeding 300mv

 

[Johannlog]

Here is the screen shot

 

[grizzzman]

Here is the screen shot

How are you powering the BMS? Off the external power port? Or internally?

 

[Johannlog]

Battery

 

[Johannlog]

Battery

 

[grizzzman]

I would recommend that you power the unit off the external power port. When I ran that unit, I found that two cells read 30 mv and 10 mv off. This caused the Balance circuit to " unbalance" the cells. Using a 12 volt buck converter then powering it this way reduced the balance mismatch.

 

[Ampster]

Have you tried lowering your charging voltage to 27 to give the cells more time to balance?

 

[Bob B]

I would recommend that you power the unit off the external power port. When I ran that unit, I found that two cells read 30 mv and 10 mv off. This caused the Balance circuit to " unbalance" the cells. Using a 12 volt buck converter then powering it this way reduced the balance mismatch.

I totally agree .... When I powered mine externally my cell voltage reading are much more accurate.

There is information in the manual about how to do this.

 

[Johannlog]

I tried supplying 12v and then 24v DC but each time I switch the switch over to external power the BMS completely shuts down like it has no power.