Perestroika

Hi there ,I just upgraded old motor on my A2B to Bafang 500w motor,it runs but only gets me to 24 km /h and can’t climb even small hills using throttle.Battery was checked recently and apparently is good,I set 20 inch wheels in the settings...Do you have any suggestions why it would happen?(runs only as throttle assist at the moment) Thanks!

Pop N Wood

The throttle assist is typically limited to something less than full battery voltage. The setting is configurable with the Bafang programmer tool. I know my set up has a considerably higher top speed with pedal assist than full thumb throttle

You should also check your current limit and max speed setting.

Here is the config software utility. Requires a $20 adapter cable

https://penoff.me/2016/01/13/e-bike-...sion-software/

By the way, if you don't already have it book mark this page

https://www.******.com/r/ebikes/wiki/bbs_faq

chas58

That didn't work. Must have used some forbidden words!

Pop N Wood

I'm not sure what is going on. Guess the word "******" is on a banned list?

I'd spell it with spaces but think that might violate a forum rule. Just look at post 4 of this link

https://electricbike.com/forum/forum...le-check-tests

Got that link from Luna Cycle as their primary documentation page. Absolutely essential information for any bafang owner

Perestroika

Thank you!

Perestroika

Hi again,
I figured what's wrong-I am running my old 36V battery with new 48 v motor and controller.
Do you have any suggestions?There are no 500W 36V option for controller,right?
Can I run 350W 36V controller with my 500W 36V motor?Or can I reprogram existing controller?

Pop N Wood

From that link I sent you

36v on BBSHD? Not possible. Lowest LVC programmable for BBSHD is 38.5 so a 36v nominal pack which gets to around 42v at 100% will still have around 70% charge when LVC cuts out.

doesn't say anything about the smaller BBS02

I've seen posts where people complete bypass the bafang controllers. They are boxes that mount external to the motor however. think I would opt for a new battery first.

Perestroika

Hi again ,thanks for the reply ,it's not BBSHD ,just 500V rear hub motor.Thanks for suggestion on the battery -i looked into it-it's internal battery ,so I would have to rebuild it,around 600$, 350W 36V controller -60$(just longer wait)

Pop N Wood

Guess I should have read your title. Saw 500w Bafang in the first post and took off.

2old

Some "36V" controllers have capacitors that will operate up to 60V. You'll need to open yours and find out. Probably you can "graft" a battery with more voltage into your system, but you'll need to work out the problem with connectors. Endless Sphere has a few individuals who have modified their A2B's. You might look at the threads there.

Doc_Wui

The motor is wound for a certain speed at a given voltage. A motor intended for 36V will run a little faster on 48V, which is alright, However, some motors designed for 48V will run too slow for the owner's liking at 36V. It has to do with what they call slow and fast windings.

As a personal experience, earlier this year I bought a motor, laced it into a 20" wheel and tried to run it on a 36. It was just too slow for me. Couldn't get over 30km/hour. It was OK with 48V battery, and would have been OK with a bigger wheel, but for my intent, it didn't spin fast enough.

Perestroika

Awesome ,thank you that's sounds interesting -I will look into it!

Perestroika

Thank's for a feed back Doc Wui,yes mine is 20 inch wheel and only gets up to 27 Km/h right now.

Perestroika

Thanks for the lead 2old,I will check out Endless sphere.

2old

There's a really bright individual, Richard Fechter (a forum mod), who has revised the system on his A2B and probably can help you.