Please help me understand why everyone decides to use the BMS output rather than the batteries. The way I see it, you use the BMS for balancing, laptop style charging, and low voltage cutoff. I don’t see the reason to output from the BMS. Additionally, you can get a much cheaper BMS because you are not needing to output 60amps from it. Am I wrong here?
BMS’s do a couple different things.
- Over Current protection. Used as another line of defense along with fuses, and VESC max amperage settings.
- Over Charge protection. One of the most useful features which helps balance cells.
- Over Discharge protection. Used with or without VESC low voltage cut off settings.
If you have a BMS, you would probably want to discharge from it to get the benefits of #1 and to save space so you don’t need a bunch of different wires for charge/discharge.
I think the real question is why would you NOT want to discharge from the BMS if you have one?
LOL @link5505 I just said the exact same thing in another thread.
haha great minds think alike
The only reason I would buy a BMS is for balancing and ez charging. I believe in the vesc to handle the rest
If you only use the bms for charging, you need a much smaller one … and at least half as expensive !!
true, i guess it depends how trustworthy a cheap bms is
A 30A is not necessarily cheaper per Amp than a 60A. It is just smaller …
decided I’m just gonna discharge through BMS for extra safety. probably getting this. What chargers do you guys recommend?
I’m referring to the cheap $10 ones you find on alibaba
Ok I understand.