Cycle Analyst problem..flashing "V' ???

[ebike11]

Hi guys
My MAC was running fine for short testing spurts with my CA V3
However during testing, I now notice a flashing "V' (voltage) on the CA main screen
I was told it is the Batt>Chemistry in the Menu, however, I selected every battery type and tested
and it still flashes most of the time, when the motor is creeping alone under 15kph it doest flash

Now I noticed my motor doesnt turn that fast now as it did when I first starting riding, so Im thinking I need to tweak some CA settings
I use the 9fet Infineon and the throttle is directly into the CA, NOT the controller

Any ideas how to solve this?
The battery that I got from a friend uses silver pouch cells stacked side by side

Thanks in advance!!

 

[Drunkskunk]

Flashing V means you've hit the low voltage cut off and it's in rollback, I think. If your battery is fully charged, then either your LVC is programmed to high, or your battery is suffering serious voltage sag.

 

[ebike11]

Ah I see!!
I thought it was because i had input the wrong battery chemistry

Now when setting the LVC should it be the voltage at half/full throttle or
when the bike is idle with 0% throttle??? Because when I let off the throttle, the voltage rises a few volts higher
when the battery has no stress applied to it

Thanks

 

[Ugrd]

Battery voltage decreases as the battery cycle is depleted. Battery voltage can also sag like you said, which can cause the LVC to come on until the draw is reduced. LVC is a hard cuttoff to prevent damage to the battery from unnessassary draw from the battery. LVC should be set to 3.65-3.7 per cell for a lipo. I dont know what chemistry your running but if you told us your chemistry and your cells we could help give you a LVC voltage.

 

[ebike11]

Yes I want to cut the voltage at 3.6V..so about 65V LVC on my 72V 18 cells battery

However, is it ok to lower it a bit more, because as you said, the protection kicks in with voltage sag after applying the throttle eventhough the battery idle voltage is generally higher

 

[Ugrd]

Yea that should be fine. 65v should be ok, I wouldn't go under 62v though. I personally stop around 67v (18cell lipo) just to help my battery live longer.

 

[ebike11]

Yea that should be fine. 65v should be ok, I wouldn't go under 62v though. I personally stop around 67v (18cell lipo) just to help my battery live longer.

The problem is the voltage drop goes under the 65V but when the throttle is released, goes up above the 65+V

 

[Ugrd]

Out of curiosity can you show me your battery or how many C's is your battery rated for? If you sagging to under 65v with a full charged battery your drawing wayyy too much. Otherwise just put it at 60v or whatever the voltage sags too with full throttle. Just don't ride below your cutoff (65v-60v)