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Trike with Bafang BBS01 too slow

Old 02-19-21, 07:39 AM
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Winfried
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Question Trike with Bafang BBS01 too slow

Hello,

Do you think a BBS01 (ie. 250W) powered by a 36V 17Ah battery is enough to ride a ~200kg/440lbs (rider + bike + load) trike with a Nexus 7 gear hub, 32/20T cogs, and 20" (406) wheels?

The owner has no problem going up hill, but complains that he has to push the Bafang to the max to ride on the flat at a non-ridiculous speed (eg. 20-22 kph/12-13 mph).

He chose a 250W to avoid the legal issues in Europe when using a more powerful motor.

Considering a Nexus 7 on that bikes translates into 18.9-46.2" gear inches (1.5-3.7m development), is that to be expected? Would upgrading the battery to 48/52V make a significant difference? Or is upgrading to a 500/750/1,000W motor the only realistic solution?

Thank you.
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Old 02-19-21, 09:10 AM
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Originally Posted by Winfried View Post
Hello,

Do you think a BBS01 (ie. 250W) powered by a 36V 17Ah battery is enough to ride a ~200kg/440lbs (rider + bike + load) trike with a Nexus 7 gear hub, 32/20T cogs, and 20" (406) wheels?

Thank you.
The BBSO1 will take more power than 250 watts but it depends on the controller and the display unit that is on the bike. If the controller is rated for 48 volts and 15-20 amps and it has a compatible display you can do it. There is another option although it would take some calls and research on your part. Grin Technologies has what is called a Phase runner MT controller, Bafang wiring harness that can be easily programed to give you what you want but I am not sure its compatible with the BBSO1. That you would have to talk to them about. The switch takes some mechanical ability and is probably cheaper than a new battery and has other bells and whistles.
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Old 02-19-21, 09:24 AM
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Thanks. I'll tell him to check if the controller+display can handle 48V.

Otherwise, maybe he could stick to what he has (36V) and just upgrade the battery to 20-30 amps ?
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Old 02-19-21, 10:03 AM
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Originally Posted by Winfried View Post
just upgrade the battery to 20-30 amps ?
Upping the amp hours does nothing to increase the power. More voltage or a bigger controller is it. I could be a simple as reprograming for more power if the controller is large enough now. Serial number on the motor would likely be the way to go to find out what controller it has. You can also use the programing cable and the Bafang software and read directly what the controller is and the software version.
A different controller is $70 to $100
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Old 02-19-21, 10:21 AM
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The BBS01 has a controller that is inside the motor. At one time that was the only difference between the 36V S01 & 48V S02 AFAIK. perhaps he could just change the controller to the S02 model. I operate my BBS02 with a 52V, 14 ah battery and it will achieve 30 mph with 52/11 gearing. It's also possible to employ an external controller.
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Old 02-19-21, 10:45 AM
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2old. correct me if I am wrong but wasn't the controller in the BBSO1 rated to 500 watts and amperage limits were set in the program for the difference between 250 watts and 500 watts? I do not know if there is more than one version of the BBSO1 controller. I may be as simple as reprograming to get 350 or 500 watts and not have to buy a new battery.

The question is very likely answered on Endless Sphere blog
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Old 02-19-21, 11:11 AM
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I'll check it out.
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Old 02-19-21, 11:48 AM
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KPREN, can't remember exactly and I didn't find out much written about it although ES has a thread from a member in AU. He's had good performance from his unit. Doesn't seem like there was much interest here since the S01 was basically a low-power S02 with about the same (maybe the same) structure and weight.
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Old 02-19-21, 09:23 PM
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Phew. Hard to find info on BBS01's. Almost seem obsolete these days

Don't know what the stock controller will handle but you can buy a replacement controllers that are rated for higher voltage batteries.

https://hallomotor.com/products/hall...shd-controller

They are programmable. So you could probably triple the power output if desired, or program it back to a legal limit in the odd circumstances anyone cares.
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