Battery with built in controller - good or bad.

[Forge Custom]

Hi

I see BMS have this - a decent Panasonic cells battery with a built in 20a sine wave controller - plus it comes with an LCD3, PAS etc etc.

https://bmsbattery.com/ebike-battery/680-48v116ah-bottle-09-panasonic-battery-pack-battery.html

Want to use this with a Q128C 36v 201RPM motor.

Any fors and againsts please? Seems to be a very convenient solution.

Cheers

Matt

 

[Deleted member 4366]

Yes, it works very well. The only problem is that wires are too long, so you have to either cut and solder them or find a way to hide them in a tool bag or whatever.

If you want 201 rpm for 19 mph max, the 48v one with the 48v battery will give loads more torque if you want it. You can turn it down in the LCD if you don't need that much, but if you find that the 36v one doesn't have enough, you can't turn it up.

 

[Forge Custom]

Cheers d8veh. Hmmm - not sure about my need for torque. Will the 36v 201rpm go quicker than the 48v 201rpm assuming both used a 48v battery and 27.5" wheels? Or is the 348rpm quicker? The combination of variables is frying my brain!

 

[Deleted member 4366]

The 328rpm one would in theory be too fast - if it is indeed 328 rpm, but I have a feeling that there's only 3 versions with the 48v 328 rpm one being identical to the 36v 201 rpm one. Whatever they are, we know that:

36v 201 rpm maxes at 19 mph at 36v (actually 42v) on the road.
36v 201 rpm maxes at about 24mph at 48v OTR.
48v 201 rpm maxes at 19 mph at 48v OTR
I've not tried the 328 rpm ones.

 

[Nealh]

Unless you live in an area with flat terrain avoid the 328rpm in big rims/wheels as they don't produce much torque.
If you have hills you need the torque so opt for 201 rpm.
With calm flat conditions with no head wind at all my 36v 201 can get to 22mph, generally though 19 mph.

 

[Deleted member 4366]

That makes it closer to 250 rpm, which is consistent with it going to 29 mph at 48v, which would be about 328 rpm. So lets call the two speeds 250 rpm and 328 rpm. That also confirms my suspicion that the low speed 36v one is identical to the high speed 48v one.