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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?
[SOLVED]
To everyone following.
Turns out the BMS was faulty, I went out to site and the BMS was making a very strange sound, like the relays were constantly clicking on and off, put the new one in and the battery level actually dropped from 100% to 48% and has been working well since.
First time this happened!
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.
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..
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
