Setting Low voltage cutoff for 52v system on BBS02

Tmiller

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Just finished my build with a BBS02 with a 52v battery. I have been programming and tweaking the settings. I purchased from a vendor who set up some programming before I got it. Was asked for Agressive/moderate riding and chose moderate. I assume the voltage for the cutoff was matched to the 52 volt battery. As I was using the programming tool and did a read of the stock settings to save to my PC, I noticed that the low voltage cutoff was set to 43. I changed it to 46 for a 52 volt system. When I went to write the settings, I got an error stating that the field was out of range. It would not accept anything larger than 43, This is where I have the setting now.

Thoughts?
 

HumanPerson

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set it to 41 or 40
i havent checked but i believe mine is set to 38, i ride it down to 40v before i even think about charging it.
 

Tmiller

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I have a chart that shows a 52 volt battery dead at 45 volts. How can a setting of 38 work without causing a massive under voltage of the 52 volt battery?
 

HumanPerson

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i guess i may be confused
are you asking what the low voltage cut off is? there are a few variables there but for the most part
a 52v ebike battery low voltage shut off is anywhere from 41v down to 35v, depending on the
battery composition and the bms ..etc..etc..etc..
 

HumanPerson

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It really all depends upon the battery cell chemestry, like the chemical composition, along with the BMS, if that makes sense.
It's weird really
 

HumanPerson

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and the brand i'd think....seems like the cheap ones are hit and miss but some of the samsung and panasonic are good...or so others say.
very strange these batteries
 

Vinz

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Good topic - I was just wondering the same thing. Thinking of getting a 52v battery for my BBS02.
I currently run a 48v battery, and the motor controller came set for a low battery cutoff of 41v, which is the recommended setting.
Using a simple ratio, the cutoff for a 52v battery would be 44.46v. But if your BBS02 came pre-set at 43v, that's where I would leave it too.
So, I don't know if I'll be able to change the 41v setting. I also wonder what effect the display might have. My 860C display can be set for a 48v or a 52v battery, It might only effect the display's battery status indicator, and not the controller setting.

UPDATE
I use the Speeed (not an error) app on my Android phone to program the controller. The highest value available for the low voltage cutoff is 43v. So that answers that question. Since the app works with the 02 and HD, it should be 43v for both.
 
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