question

Ross_SkyEnergy avatar image

BYD BBox Pro reading 0% SOC on CCGX but 100% on battery

Hi guys


I have a site that has a Multiplus II and CCGX. AC Coupled with an SMA Sunnyboy 5.0 inverter and BYD BBox Pro 13.8Kwh battery.


Everything was working really well up until about a month ago, the CCGX is reading the battery SOC to be 0% but the mulitplus is showing 55v (or 100% SOC) and the BYD battery is also showing 4 full LEDs so full as well.

I have tried resetting the entire system and it does the same thing.

Has anyone had this issue?




Multiplus-IIBYD
screen1.png (24.8 KiB)
screen2.png (19.6 KiB)
screen3.png (25.0 KiB)
614479646-2.jpg (102.5 KiB)
10 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
SolarHack avatar image
SolarHack answered ·

From the picture above it looks like your BMS run light is off. That would say your BMS has either failed or has no power. The BMS has a power cable at the back.

2 comments Share
10 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Hi @SolarHack


The light is off in this picture, but it does flash if you pull the BMS cable out indicating "no bms" and the GX also says it's been disconnected. It's weird because the GX is detecting the battery, it's just getting the wrong readings..

My light is on permanently, it only flashes when I remove the cable or reboot the batteries.

To me its one of the following

  • Faulty BMS/BMU unit
  • Faulty Can bus cable
  • Faulty battery cable

To be safe I would also check the system setup as mentioned above. I don't think that would change the light state, but you never know.

Here is my CCGX

1593254937060.png (25.5 KiB)
JohnC avatar image
JohnC answered ·

Hi @Ross_SkyEnergy

First thing to check is where your GX is set to read it's displayed SOC from. Some explanation here: https://www.victronenergy.com/live/ccgx:start#battery_state_of_charge_soc



1 comment Share
10 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Hi @JohnC


GX is set to Auto and it has selected the BYD


1593225800824.png (27.1 KiB)