bbs02 stops working when cold

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travisraw   1 µW

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bbs02 stops working when cold

Post by travisraw » Feb 17 2020 11:00am

I am a new to ebike world. Built my first using a bbs02b with 48v hailong 13ah battery. 850c display on an old ccm 29er frame.
everything was perfect for first 100k. Now as soon as bike is cold. -7 c or so the throttle and the pas stop. as soon as i walk my bike home and it warms up it works perfect again? Please can some one offer me guidance?

travisraw   1 µW

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Posts: 2
Joined: Feb 17 2020 10:48am

cold temp problem bbs02

Post by travisraw » Feb 17 2020 11:08am

I am a new to ebike world. Built my first using a bbs02b with 48v hailong 13ah battery. 850c display on an old ccm 29er frame.
everything was perfect for first 100k. Now as soon as bike is cold. -7 c or so the throttle and the pas stop. as soon as i walk my bike home and it warms up it works perfect again? Please can some one offer me guidance?

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DogDipstick   1 kW

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Location: Fleetwood Pa

Re: bbs02 stops working when cold

Post by DogDipstick » Feb 17 2020 12:10pm

Does the BMS control a LOWTEMP shutoff? Many will stop power on very low temps.
Allota Watts @ 83.1v of raw QS power takes me everywhere on my Ironhorse DW link XC... :) Powered by Chevy. :D Broke 10 horses the other day. ( BTW; ...don't get hurt... :? )... (Currently building a battery datalogger.). :roll: Playin with (24) IRFB4115s now. :wink:

john61ct   1.21 GW

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Re: bbs02 stops working when cold

Post by john61ct » Feb 18 2020 6:13am

Feature not a bug

AngryBob   100 W

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Re: bbs02 stops working when cold

Post by AngryBob » Mar 14 2020 5:41pm

RTFM?

miro13car   1 MW

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Location: Calgary, Canada

Re: bbs02 stops working when cold

Post by miro13car » Mar 25 2020 12:23pm

are you kidding me?
whatever ebike drive cut off at minus7C outside?
my ebike drive EPLUS works normally in minus 17C winter with no problems.
battery made of Nissan Leaf cells 11S do not suffer any damage at minus7C for sure.
hailong cells suffer at minus 7C ???!!!
Eplus, Bionx

john61ct   1.21 GW

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Re: bbs02 stops working when cold

Post by john61ct » Mar 25 2020 2:14pm

Discharge is different

Fast charging that cold can murder the pack

markz   100 GW

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Location: Alberta Canada

Re: bbs02 stops working when cold

Post by markz » Mar 25 2020 2:56pm

Engineered failure for higher profits
miro13car wrote:
Mar 25 2020 12:23pm
hailong cells suffer at minus 7C ???!!!

docw009   100 kW

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Location: Chicago area suburbs.

Re: bbs02 stops working when cold

Post by docw009 » Mar 25 2020 3:13pm

-7C is about 20F. Could be some batteries that shut off below 32F. Mine don't.

AngryBob   100 W

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Re: bbs02 stops working when cold

Post by AngryBob » Mar 25 2020 7:03pm

Since this is not likely to be a hardware fault, you could spend a few hours researching the BMS and controller you purchased, or go very carefully through all user-available settings for each and look for a temp cutoff you can modify.

Also you could look carefully for a temp sensor, they are pretty standard and easy to identify. Then, you can find out what happens if you simply disable it, if that fails then either rig a small heat source or a way to spoof it. Possibly as simple as replacing with a differently-calibrated sensor.

john61ct   1.21 GW

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Re: bbs02 stops working when cold

Post by john61ct » Mar 25 2020 8:31pm

Many BMS don't know from temperatures at. all.

AngryBob   100 W

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Re: bbs02 stops working when cold

Post by AngryBob » Mar 26 2020 6:35am

Some component on his system apparently does.

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serious_sam   100 W

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Location: Australia

Re: bbs02 stops working when cold

Post by serious_sam » Mar 29 2020 12:47am

Could be significant battery IR increase due to cold. Battery voltage drops under load. Either BMS or controller cuts out due to LVC. No problems with IR when battery temperature increases.

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