Workaround for the communication problems - change resistor in controller

[CrAzYDr1veR (Marc Rodrigues)]

if possible check on a computer where the packets get lost, on android not all the information is available in the modules tab.

[SergioF (Sérgio Fernandes)]

Good morning, after redoing the communication wiring with the jst connectors, it seems to me that the problem has been solved! A whole night without fails. I still can’t believe it, I’ve reviewed the welds 1000 times…!
Now I just have to do this for the 84 cells of the lithium battery and connect to the inverter!
Here I leave photos of the current work and one of the home assistant’s preliminary screen.
Thanks and regards,
Sergio

[Tiger_One (David Hanson)]

I don’t believe this is my problem, but couldn’t find where else to post.
14S 100P V4 running fine for a long time. Just top balancing not been exercising the cells.
Lost communication with module #7 (beginning of last row of 14S). Green lights running as normal, however no data as to the cell.

I have inspected the module and reheated with blower, still no joy.

[stuart]

Ok, suspect it’s just lost its calibration settings.

See if the calibration value are all zeros.

If they are, reflash the code to the module and it should fix it.

[Tiger_One (David Hanson)]

First, thanks for the quick reply. I am 3 weeks into complete knee replacement so not a good time for me to be working on this, but I can build another module if needed (think I have all the parts).

They are all zeros. Flashed it now no comm at all with any of modules.
Thinking I need to flash all of them with the new V400 version.
Question : Do the power and TX and RX leads need to be disconnected before flashing? I did this on the cell in question.
Also if I do flash all modules do I need to also update the controller flash?

P.S. I bypassed the bad module and jumped to the next module, all modules appear normal. So, maybe I have flashed the bad module with wrong version?? Think I was on v4.2 before the latest changes which include all versions. Will look at my code locations.

SUCCESS!!! I was able to flash all modules V400 while connected but controller off.
Was able to flash controller after modifying this in INI file:
platform_packages =
; platformio/[email protected] // these gave errors I found the below fix after googling errors
; platformio/framework-arduinoespressif8266

   framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git
   toolchain-xtensa @ ~2.100200.0 ; future 10.2

Thanks @stuart AGAIN!!! Really inspired by all the new stuff you and others are still doing to make this better. Users like me really love this and the continued support. I’m just barely able to keep up with the changes but like where you are going.
Thanks again SIR!

[stuart]

Great, glad it’s working

[stuart]

@Albert

@stuart Yes correct this is what I have done. Last thing I changed was R29 from 47K to 2K2 That is now running from yesterday evening on till now without any error even with the motor with brushes (sparking all over the place) in between the wires.

Hello @Albert although its been a while since you posted the above, are you still running with this setup? How are you finding it?

[jbuszkie (Jim B)]

I’ve been using about 550ohms…
2.2K didn’t work for me.
I’m close to 1M packets and 15 errors…
I might try the inversion fix for the new controller if I can ever get my hands on all the parts! lol

[stuart]

@jbuszkie

I’ve been using about 550ohms…
2.2K didn’t work for me.

Thanks for the feedback.

[jbuszkie (Jim B)]

@stuart

@Albert I did a quick modification to the controller circuit based on your design - screenshot below.

Does this resemble what you have built?

How’s the testing going?

@stuart , did you ever make these changes to the layout? I was about to implement them myself, but if you already did the work… I’d rather use your layout if it’s going to be the default going forward…

[jbuszkie (Jim B)]

@stuart

Thanks for the feedback.

Oh… And my was the original fix, not added the inverter… I just reread the thread and you were asking about the other mod… sorry for any confusion…

[stuart]

@jbuszkie

@stuart , did you ever make these changes to the layout? I was about to implement them myself, but if you already did the work… I’d rather use your layout if it’s going to be the default going forward…

I’m just looking at what changes I can make to improve the parts availability, but at the same time, this is a simple change if it makes a significant improvement.

[Albert]

I had to go to the bms and have a look:-) for the past months I didn’t look at it. It is still in use with the modification but not on a setup with high current. It is connected to a 18s10p battery that is charged with 10amps and discharged by only 1amp. In the past months it developed 36 crc errors (webinterface ) I have no view on if the controller recently rebooted.

I still did not start building the real big ~25kwh battery due to postponed laws in the Netherlands. It is currently not yet needed to store big amounts of energy so for now I still do experiments with the small battery and a system to measure import/export energy to the grid and drive the charger according measurements.

[Nico_F (Nico)]

Hi @Albert @stuart , I need more modules and more reliable speed in comm, what do you think about this design? Thanks
module 440:

Controler:

[stuart]

@Nico_F you still don’t need to change to a 3 wire cable to achieve the above circuit.