Bafang BBS01B 250w 36v vs 48v ET

Electrically assisted bikes, trikes, etc. that are legal in the UK
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Louey
Posts: 9
Joined: 26 Mar 2021, 3:05pm

Bafang BBS01B 250w 36v vs 48v ET

Post by Louey »

Hello all, I’m yo-yoing around deciding on a crank drive motor for my first conversion. Want to optimise hill climbing rather than speed, sticking to what’s (ostensibly) road legal.

The Bafang BBS01B 36v 250w I believe puts out 80nm of torque at around 80 rpm. The BBS01B ET 48v 250w claims around 100nm. Various threads say this is essentially a BBS01B 500w, marked as 250w. If so, then as far as I can make out it would produce peak torque at more like 118 rpm. So, better for climbing, but only if you pedal faster?

My cadence isn’t great, mangled a leg on a motorbike many years ago. Maintaining 80 rpm is far more realistic, which leaves me wondering if I’d really notice the difference.

Just wondered if anyone has any thoughts, or has more reliable knowledge of the difference between them? (Apart from 12 volts, of course).

Many thanks,

Louey
hemo
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Joined: 16 Nov 2017, 5:40pm
Location: West Sussex

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by hemo »

The 48v ET version is 672 watts max output, which I wasn't aware of.
I know there is a 36v ET version.
The std 36v bbs01 250w is 15a rated and the same 36v version in ET mode is 25a rated so it is a bit of pulling the wool over as far as the 250w rating goes. One having a max 540w output and the other some 900w.
Louey
Posts: 9
Joined: 26 Mar 2021, 3:05pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by Louey »

That’s interesting hemo, thanks. Can only see the 36v ETM at Brighton E-bikes, where it’s a bit spendy and comes as a full kit with only one battery option. Woosh have the 48v. I’m leaning more towards the standard 36v kit as being easily available, more battery options and in all honesty probably pokey enough.
Chonka
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Joined: 19 Nov 2022, 4:50pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by Chonka »

Hi louey
I have been running a 36v 250w bbs01b etm with a 17.5A battery for the past 3 years. I am sure that you will be very pleased with this kit if you go ahead. I have recently been doing loads of research, as because of failing health I need more power, especially on hill climbs plus more speed would be nice. I was considering upgrading to 48v 750w bbs02 24.5ah battery but I believe that this upgrade wouldn't be much of an improvement in performance and wouldn't justify a grand outlay. I believe that he bbs01ETM is comparable to a bbs02 500w. It has a25A controller and on my display I have seen it pulling around 900w peak and it has 100nm torque. When I purchased the kit I reprogammed the throttle speed to 25mph as I have to use the throttle regularly to keep giving myself a rest. I use the throttle sometimes for hill climbs but very sparingly as I'm conscious of blowing to controller/overheating. Plus using the throttle saps the battery quickly.
I hope this helps?
Dingdong
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Joined: 22 Apr 2022, 4:59pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by Dingdong »

672 Watts is very respectable!
Louey
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Joined: 26 Mar 2021, 3:05pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by Louey »

Thanks chonka, it does. Is there plenty of oomph right from when you start pedalling?

My points of reference for crank drives are having ridden bikes with a Bosch Active Line putting out c.40 Nm - ok, I guess - and a Giant with their 70 Nm version of the Yamaha motor, took off from a standing start in any gear. Loved the motor on the Giant, but hated the bike.
Chonka
Posts: 2
Joined: 19 Nov 2022, 4:50pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by Chonka »

Louey

Plenty of oomph on start in low gear with full battery. I use throttle to set off due to not much power in my legs, and on full power, full battery and low gear, it will pull a small wheelie. I seem to remember having a test ride from halfords with a bosch mid drive motor before i built my own and this seemed a lot smoother but for that you're paying twice the price. Also there is no throttle on a shop bought bike which is essential for me, not only for setting off but to give me breaks from pedalling.
chrissmith
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Joined: 1 Aug 2011, 10:35pm

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by chrissmith »

Sounds like you are near Brighton. If so check out the bafang ebike conversions by mr cycles of seafood.
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bikes4two
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Location: SE Hampshire, UK

Re: Bafang BBS01B 250w 36v vs 48v ET

Post by bikes4two »

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Without my stoker, every trip would only be half a journey
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