Denis Heidtmann
10 µW
- Joined
- Aug 6, 2022
- Messages
- 6
I have two virtually identical ebikes. On one of them, the red bike, when I turn on the battery switch then press the button to boot the display the display flashes some version of its opening screen then it shuts down; goes blank. Further attempts pressing the button elicits no response. Then if I power off the battery and power it on again the display starts in response to the button press as it should. The bike then will work fine. This has been very reliable behavior. I moved the battery to the second bike (yellow) (tried once): the second bike showed the same bad behavior. The second bike with its usual battery works fine.
I do not know how long the bike needs to sit with the battery switch off for the issue to repeat itself--overnight is sufficient, however.
I measured the unloaded terminal voltage of both batteries (On the bench). I get 54.2 to 54.7V. I put them on a 'scope and see almost no difference between them, although since the yellow bike gets a little more use its voltage is decreasing faster than the red. But we are still above 50V--not using them much lately.
My next test is to check the battery voltage when first the battery switch is turned on when on the bike. I now have a cable to permit me to do that.
Here are the details of the red bike, taken from the labels on the components. Clearly this is a Bafang system, installed in 2020. We used the bikes locally for about 1 year, then used them little due to a house move. No bad behavior at that time. We just started using them again about a month ago. The outfit that installed the systems has not been any help. Most recently I asked for wiring diagrams and details--no response. That is why I am hoping you people here can offer suggestions.
DISPLAY: C965 A0248 BFL.0 V5.0 2003300470
BATTERY:48V 12 Ah 29E 202006010085
MOTOR: BBS02B 48V 750W 2007040545
CONTROLLER: CR R209.750.SN; C571-30-512; 2007021391
Thanks,
-Denis Heidtmann
I do not know how long the bike needs to sit with the battery switch off for the issue to repeat itself--overnight is sufficient, however.
I measured the unloaded terminal voltage of both batteries (On the bench). I get 54.2 to 54.7V. I put them on a 'scope and see almost no difference between them, although since the yellow bike gets a little more use its voltage is decreasing faster than the red. But we are still above 50V--not using them much lately.
My next test is to check the battery voltage when first the battery switch is turned on when on the bike. I now have a cable to permit me to do that.
Here are the details of the red bike, taken from the labels on the components. Clearly this is a Bafang system, installed in 2020. We used the bikes locally for about 1 year, then used them little due to a house move. No bad behavior at that time. We just started using them again about a month ago. The outfit that installed the systems has not been any help. Most recently I asked for wiring diagrams and details--no response. That is why I am hoping you people here can offer suggestions.
DISPLAY: C965 A0248 BFL.0 V5.0 2003300470
BATTERY:48V 12 Ah 29E 202006010085
MOTOR: BBS02B 48V 750W 2007040545
CONTROLLER: CR R209.750.SN; C571-30-512; 2007021391
Thanks,
-Denis Heidtmann