BBSHD / BBS02 Operating temperatures?

[kajimike]

Good morning,

I would like to know what are the 'normal' operating temperatures for these motors? I mean biking along at a moderate assist level, not mashing your way up some steep hill, or constantly starting from a dead stop in a high gear.

I've seen these numbers but they do not really answer my question above:
>>
140F + Stop riding and let it cool
130F + Don’t use full throttle, only half throttle
120F + Take it easy
110F or less go whole hog
<<

Thanks

 

[tomjasz]

starting from a dead stop in a high gear.

Will kill a BBS01-02-02B.

110-120 if keeping the 02 at proper higher RPM's. Lugging overheats and fries things fast. BBSHD is another story. I ran one of mine, BBSHD, as a one-speed 42T x 20T with throttle takeoffs. ANd no issues. I'd have killed a couple of BBS02 treating them that way. Karl's numbers are good. I'd call 110-120F an operating temp. YMMV.

 

[kajimike]

>> I'd call 110-120F an operating temp.
Are these values you have actually seen yourself, with a temperature probe added to the BBSHD?

 

[tomjasz]

I've been riding BBSxx motors since 2014 and supporting BBSxx series motors since 2015. I probably take 10-20 customer service calls and as many emails for BBSxx motor support daily, M-F. I've owned or own every model BBSxx series motor. So for what it's worth, those are my numbers.

 

[Gionnirocket]

Good morning,

I would like to know what are the 'normal' operating temperatures for these motors? I mean biking along at a moderate assist level, not mashing your way up some steep hill, or constantly starting from a dead stop in a high gear.

I've seen these numbers but they do not really answer my question above:
>>
140F + Stop riding and let it cool
130F + Don’t use full throttle, only half throttle
120F + Take it easy
110F or less go whole hog
<<

Thanks

Whenever I've felt my motor after riding as you described it's always been at ambient temp.
I'd take those published temps with a grain of salt as they're obviously provided by someone who's looking to ride as hard as possible.
That said... I wouldn't bother opening up my motor to silicone in an aquarium thermometer

 

[tomjasz]

I wouldn't bother opening up my motor to silicone in an aquarium thermometer

If riding a BBS02B hard, it's a good idea. Although much more critical in the earlier versions of the BBS01 and BBS02. BBS02B have better, read more heat tolerant and more FETs.

 

[Gionnirocket]

If riding a BBS02B hard, it's a good idea. Although much more critical in the earlier versions of the BBS01 and BBS02. BBS02B have better, read more heat tolerant and more FETs.

If riding a BBS02B hard, you should have purchased a BBSHD

 

[tomjasz]

If riding a BBS02B hard, you should have purchased a BBSHD

That's just not so. They are very different motors, but the BBS02B is a great motor, for a rider. BBSHD for louts and fat guys running on throttles.

 

[Gionnirocket]

That's just not so. They are very different motors, but the BBS02B is a great motor, for a rider. BBSHD for louts and fat guys running on throttles.

Perhaps it would be better for louts & fat guys to pedal more and worry about thier own operating temperature

 

[E-Wheels]

Will kill a BBS01-02-02B.

110-120 if keeping the 02 at proper higher RPM's. Lugging overheats and fries things fast. BBSHD is another story. I ran one of mine, BBSHD, as a one-speed 42T x 20T with throttle takeoffs. ANd no issues. I'd have killed a couple of BBS02 treating them that way. Karl's numbers are good. I'd call 110-120F an operating temp. YMMV.

Thomas calling on your vast experience with the Bafang mid drive kits
If you had to choose between the BBS02 or BBSHD, which do you consider the best choice for commuting, in regards to battery usage Wh per Km, reliability and total cost of ownership say over a 12-18 months

 

[Gionnirocket]

Thomas calling on your vast experience with the Bafang mid drive kits
If you had to choose between the BBS02 or BBSHD, which do you consider the best choice for commuting, in regards to battery usage Wh per Km, reliability and total cost of ownership say over a 12-18 months

To help Thomas answer your question... I think it might be helpful to know the type of bicycle, current rear gears, bicycle weight and possibly yours as well.
Just my two cents

 

[E-Wheels]

To help Thomas answer your question... I think it might be helpful to know the type of bicycle, current rear gears, bicycle weight and possibly yours as well.
Just my two cents

The host bike I intend to use is a Giant Roam with a Shimano 10SP 11-25 cassette, and weights approx 13kg
I weigh 85kg
My commute will be 400km per week

 

[tomjasz]

All things equal, BBSHD 38.2 Wh/mi, BBS02 33.4 Wh/mi. BBS02 has a slight edge in total miles per charge, but not by more than 2-4 more miles. BBSHD has the edge for speed.

 

[tomjasz]

50 miles (80km) is a pretty long daily commute. Above numbers are 100% throttle. But the two motors are very close in power use.