BBSHD watts dropping under load problem

[djneils98]

Had a BBS02 installed on my bike for a few weeks now but today got the chance to test out a BBSHD so swapped over.
It all works well except that when under full throttle the watts meter on the display (500c) drops from showing about 1200w to virtually nothing. The motor is still putting out power and the bike goes very fast still.
Also I would have expected the max watts to show about 1500w nor 1200w - it's a 52v battery and the BBSHD firmware is limited to 28 amps (that's how the 52v ones come)
Could the problem be the battery not being able to provide enough amps? it is this one I got from Eclipse and it says it is capable of 29amps continuous and 39 burst.

 

[tomjasz]

It appears that you have an EM3ev battery. If in fact, you do there should be a BlueTooth BMS.
You can reach out to EM3ev. Emails can be slow. AND China is on holiday for another week.
Do you have a smart phone? Android? iPhone?

Your source should provide support.

 

[rich c]

Does this happen with a freshly charged battery, or after a number of miles?

 

[tomjasz]

Does this happen with a freshly charged battery, or after a number of miles?

I failed to ask how old the cell pack is? Was it sagging with the BBS02?

 

[djneils98]

It appears that you have an EM3ev battery. If in fact, you do there should be a BlueTooth BMS.
You can reach out to EM3ev. Emails can be slow. AND China is on holiday for another week.
Do you have a smart phone? Android? iPhone?

Your source should provide support.

yes it has a bluetooth bms and I have an iPhone app that connects to it

 

[djneils98]

I failed to ask how old the cell pack is? Was it sagging with the BBS02?

the pack is not very old - a couple of months if that. with the BBS02 it seemed to work fine - not sure what you mean by sagging - under load the voltage would drop a little but I thought that was normal?

 

[djneils98]

Does this happen with a freshly charged battery, or after a number of miles?

I tried it with the battery at 80% charge and it did it straight away

 

[djneils98]

these are the controller setting the BBSHD came with

 

[djneils98]

It appears that you have an EM3ev battery. If in fact, you do there should be a BlueTooth BMS.
You can reach out to EM3ev. Emails can be slow. AND China is on holiday for another week.
Do you have a smart phone? Android? iPhone?

Your source should provide support.

do you think this is a battery issue then? even though the watts shown on the display drops at max throttle (PAS 9) the motor does not stop or drop in power - the bike hits 35mph

 

[tomjasz]

do you think this is a battery issue then? even though the watts shown on the display drops at max throttle (PAS 9) the motor does not stop or drop in power - the bike hits 35mph

Is it a BT BMS?

 

[djneils98]

Is it a BT BMS?

yes it is

 

[tomjasz]

yes it is

So, have you accessed the battery data on your phone?

yes it is

Any issues show up when you access the app?
Your reseller ought to be supporting you.

There are a dozen or more .el files you can access online to parrot and make changes.

 

[djneils98]

So, have you accessed the battery data on your phone?

Any issues show up when you access the app?
Your reseller ought to be supporting you.

There are a dozen or more .el files you can access online to parrot and make changes.

no issues at all on the battery app - no warnings or anything. I have the iOS app though, apparently the android one is better
I only tried this today - I have not asked the seller of the battery yet as wasn't sure it is the battery and it's the weekend - he's been very helpful with other things so can contact him on Monday.

 

[tomjasz]

Bafang Programming - Learn how to improve your Bafang mid-drive ebike - Edrivenet

Learn how to improve your Bafang mid-drive ebike. Reprogramming your Bafang mid-drive system can improve the usability and performance of your ebike a lot.

edrivenet.com

A Google search, bafang .el files, will find them online.

 

[tomjasz]

apparently the android one is better

I'm not aware of any iOS issues. I see more problems with Android versions and their compatibility. @Gionnirocket He and others will help you sort programming.

​

 

[djneils98]

Bafang Programming - Learn how to improve your Bafang mid-drive ebike - Edrivenet

Learn how to improve your Bafang mid-drive ebike. Reprogramming your Bafang mid-drive system can improve the usability and performance of your ebike a lot.

edrivenet.com

A Google search, bafang .el files, will find them online.

I'm confused - are we talking about the battery or the controller?
I have changed a couple of parameters in the controller settings that were set to values the main programming guide didn't recommend https://electricbike-blog.com/2015/06/26/a-hackers-guide-to-programming-the-bbs02/
will see if that makes any difference in the morning with a freshly charged battery

 

[tomjasz]

Controller files are .el files.

 

[djneils98]

I have tested again and the problem remains - I noticed that the freshly charged 52v battery drops from 58v to 50.4v under full throttle - could this be the issue?