Question about using 52v with BBS02

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Xray   100 mW

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Question about using 52v with BBS02

Post by Xray » Jan 30 2016 6:39am

Does using a 52v battery with the 48v 750w BBS02 cause any long term problems? I'm about to pull the trigger on purchasing a complete system and I'm trying to decide between 48v and 52v. If the watt hours are similar between the 2 batteries is there any advantage one way or the other?

Raged   1 kW

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Re: Question about using 52v with BBS02

Post by Raged » Jan 30 2016 8:49pm

It should be fine if the kit you are buying is using the upgraded FETs ( They switched mid July 2015 )

Ive been running 14s ( 58.8v ) on my BBS02 29er cyclocross fine with the new controller for about 4 months. The old controller popped if it was at the ege of its limits.
Focus Black Forest 29er - MAC10T 14S Lipo - 50km/h, 50km range. (dead)http://endless-sphere.com/forums/viewto ... 91&start=0
Cube Reaction 29er Cyclocross BBS02 http://endless-sphere.com/forums/viewto ... =6&t=70549

dilkes   100 W

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Re: Question about using 52v with BBS02

Post by dilkes » Jan 30 2016 9:03pm

Raged wrote:It should be fine if the kit you are buying is using the upgraded FETs ( They switched mid July 2015 )

Ive been running 14s ( 58.8v ) on my BBS02 29er cyclocross fine with the new controller for about 4 months. The old controller popped if it was at the ege of its limits.
Just wondering what that means "popped "? Did that render the controller unusable and needing repair? Or could it be reset by disconnecting /reconnecting the battery?

Raged   1 kW

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Re: Question about using 52v with BBS02

Post by Raged » Jan 31 2016 7:50pm

dilkes wrote:
Raged wrote:It should be fine if the kit you are buying is using the upgraded FETs ( They switched mid July 2015 )

Ive been running 14s ( 58.8v ) on my BBS02 29er cyclocross fine with the new controller for about 4 months. The old controller popped if it was at the ege of its limits.
Just wondering what that means "popped "? Did that render the controller unusable and needing repair? Or could it be reset by disconnecting /reconnecting the battery?
Popped as in dead and get a replacement controller with the upgraded FET's.
Focus Black Forest 29er - MAC10T 14S Lipo - 50km/h, 50km range. (dead)http://endless-sphere.com/forums/viewto ... 91&start=0
Cube Reaction 29er Cyclocross BBS02 http://endless-sphere.com/forums/viewto ... =6&t=70549

2old   100 kW

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Re: Question about using 52v with BBS02

Post by 2old » Jan 31 2016 9:55pm

FWIW, I've been running an "old" BBS02 with a 52V, 10 ah Luna battery for a few months, but relatively gentle (30 mph max) use; no problems yet.

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Samd   1.21 GW

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Re: Question about using 52v with BBS02

Post by Samd » Jan 31 2016 10:10pm

I run 62.0v HOC on 15s lipo on a vintage bbs02 - one fo the first made. Still going fine.
http://ballaratebikes.com/

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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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dogman dan   100 GW

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Re: Question about using 52v with BBS02

Post by dogman dan » Feb 01 2016 7:49am

What's 52v? They call 13s "48v" It charges to 54.6v. and they call 14s 48v, unless they call it 52v. it charges to 58v. Both are less than a typical 48v controllers max voltage for the capacitors inside, which is generally 63v.

So don't go above charges to 63v. Personally, I like 14s, but 13s is increasingly the standard, and the bafang is surely designed with the intent to run it at 13s.

2old   100 kW

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Re: Question about using 52v with BBS02

Post by 2old » Feb 01 2016 10:44am

Agree; mine is 14s, 52V nominally, but measured to 58.8 fully charged.

Raged   1 kW

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Re: Question about using 52v with BBS02

Post by Raged » Feb 02 2016 1:33am

Oh... I was using a 48t chainring... which probably loaded it a bit too much as well.
Focus Black Forest 29er - MAC10T 14S Lipo - 50km/h, 50km range. (dead)http://endless-sphere.com/forums/viewto ... 91&start=0
Cube Reaction 29er Cyclocross BBS02 http://endless-sphere.com/forums/viewto ... =6&t=70549

puregsr   100 W

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Re: Question about using 52v with BBS02

Post by puregsr » Feb 05 2016 4:03am

Just curious, I'm assuming you need to change the LVC when switching from 13S to 14S (41V to 43V), am I wrong?

Raged   1 kW

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Re: Question about using 52v with BBS02

Post by Raged » Feb 05 2016 7:45pm

puregsr wrote:Just curious, I'm assuming you need to change the LVC when switching from 13S to 14S (41V to 43V), am I wrong?
Only when you go down in voltage. Your BMS should protect your battery before the LVC does.
Focus Black Forest 29er - MAC10T 14S Lipo - 50km/h, 50km range. (dead)http://endless-sphere.com/forums/viewto ... 91&start=0
Cube Reaction 29er Cyclocross BBS02 http://endless-sphere.com/forums/viewto ... =6&t=70549

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tomjasz   10 GW

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Re: Question about using 52v with BBS02

Post by tomjasz » Feb 06 2016 1:27am

Raged wrote:Oh... I was using a 48t chainring... which probably loaded it a bit too much as well.
52t is fine to, unless you lug the motor, it's not the chainwheel it's the user.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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gridlok   10 W

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Re: Question about using 52v with BBS02

Post by gridlok » Feb 06 2016 12:24pm

I have hundreds of hours of hard riding on BBS02's with 52v batteries (16S LifePo4). One blown controller early on, after that I got smart and used smaller chainrings.

Doesn't like full throttle on hills when it is already hot and spinning too slow. If you spin it fast you can beat the piss out of it with impunity.

All old Mosfets.

Karl
Fatbikes+Electric=Awesome : http://www.electric-fatbike.com

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