I’m modding a Onewheel+ by replacing the internal battery and BMS.
The new BMS will be used for charge only.
Power ON/OFF is handled with a loop key on battery-.
Now when I plug the balance wires on the BMS, my onewheel powers up (I can connect to the board from the bluetooth app).
I figured that if I setup a loop key on battery+ instead of battery-, I don’t have this problem anymore.
But why is the charge circuit powering up the onewheel ?
I have limited electronics knowledge so I’m concerned that if I ride like this, the high amps load might go through the BMS balance wires, which would blow off the wires.
-B goes to battery main negative.
Charge + to battery main positive
Charge - to bms C-
Charge + to battery main positive
Discharge + to battery main positive
Discharge - to battery main negative.
The balance wires are soldered the same
That’s a usual bypass
Take into consideration that if you plugged the balance wires without B- soldered to battery main negative there’s a big chance to have fried the bms
B- is the communication between bms and battery. If you hang that phone…shorts are to come…
Check your bms diagram and the seller’s instructions. Depending on the bms architecture it is fried or not.
Check smells or burnt traces. If they didn’t happen maybe yer lucky.
No!!!
Is B- on main negative? It is not…
Read what I wrote and think about it.
I have made made how to videos at YouTube.
It’s plenty of them actually.
Do your homework or build a bomb.
Your choice.
Battery building is not rocket science but deserves some respect.
Gather the knowledge and then go for it
Hi, guys, am new to BMS wiring. I want make a top mounted battery connected in parallel to an enclosure battery. My first battery is a 20S8P and the top mounted one is a 20S4P. Instead of using two different BMS, I was thinking about slightly cutting each wire exposing the copper and soldering a second wire to connect it to the first P groupe of the top mounted battery and doing the same for all P groups effectively making a 20S 12P wired to one BMS. Is this approche to BMS wiring feasible ?