Good morning Dave, I’m hoping those batteries were picked up. I haven’t heard anything from my friend saying they weren’t. Let me know!
Was laying in bed last night thinking…my downfall…do I have to take any precautions with my dc to dc converter being that I’m running a higher voltage?
No, just plugged it in, left the bms settings as they came. Did a sanity check to make sure voltage went up from pin to pin, not that I skipped or missed one.
Plugged it all in, flipped main on the car and it released the smoke.
Do you have another one? I got the resisters off but it cooked some of the board. I don’t think I can fix it.
Load was not hooked up, charge only. The only thing that was not ordinary was B- went to the negative on the controller instead of battery one directly.
I’ve been running these bms for years without trouble.
I can’t think of what could burn shunt resistors.
Resistors and transistor switches connect across each cell to discharge high cells. Only high voltage across those two can burn them.
If I had to guess, it would be high resistance power connections on those two cells.
I couldn’t tell you, that’s above my pay grade! What is a high resistance power connection?
I don’t expect you to pay for something that I may have done or we can’t explain. I’ll gladly pay for another. I have put 3 electric skateboards together, two with Lipo and BMS, they always worked fine, when I built a board with an 18650 pack it loved to smoke bms’s for some reason. Did you happen to find one?
The cell to cell connections are the one I refer to.
If one was loose or not making good connection, the entire pack voltage would appear across the balance leads.
In theory a bad cell would do the same. Before changing anything, measure voltage across those two cells under load. If you can’t find the problem, will likely recur.