BMS error 301

[vikumj]

My battery SOC % is set to 94% roughly 53.4V.
But even after charging is completed and 00 Amps are transmitted from inverter, battery voltage keeps climbing up to 54.5V an BMS cuts off with the error code 301.
Inverter is Growatt SPH 5000.
Battery is 51.2V 200A.

Can anyone here help me out to figure out what causes this issue?
TIA!

Pictures of voltages of cells, battery percentage and system voltage are attached below for a better understanding.

 

[DougfromdaUP]

The power is coming from somewhere. Check with a multi-meter. I suspect your inverter is still raising the voltage.

Do yo have any other charging devices connected?


Are you only charging to 53.4 volts? That is very low for LFP batteries, if that's what you have. Usually the battery won't start to balance until the cells get to 3.4 volts - 54.4 for a 16 s battery

 

[Shokbox]

My battery SOC % is set to 94% roughly 53.4V.
But even after charging is completed and 00 Amps are transmitted from inverter, battery voltage keeps climbing up to 54.5V an BMS cuts off with the error code 301.
Inverter is Growatt SPH 5000.
Battery is 51.2V 200A.

Can anyone here help me out to figure out what causes this issue?
TIA!

Pictures of voltages of cells, battery percentage and system voltage are attached below for a better understanding.

Hi
Did you resolve this and can I ask how please ?

 

[Shokbox]

Subject: Recurring BMS 301 Error with Growatt SPH 6000 and SUG LiFePO4 Battery System

Hello,

I'm encountering a frustrating issue with my new solar setup and would appreciate any advice. I've installed a Growatt SPH 6000 coupled with a SUG LiFePO4 Energy Storage Battery (51.2V 200Ah 10.24kW). Within three days of installation, I noticed that the battery, though fully charged at 99%, didn't discharge overnight.

After contacting Growatt, they advised me to restart the system. They also remotely checked the setup, which initially cleared the BMS #301 fault code. The system then functioned perfectly for three days—charging during the day, feeding the load, exporting to the grid, and discharging overnight as expected. However, the BMS 301 error has reoccurred. I tried restarting the system again, but the fault has not cleared this time.

I've reached out to both Growatt and SUG, but I anticipate that they may point fingers at each other. A few points to consider:

• My communications cable running to the CT is laid alongside an AC cable in some places. Could this be affecting the system?
• I am not entirely sure if the CT is a genuine Growatt part, which might be causing compatibility issues.
• Since the error has cleared a couple of times before, I suspect it might not be a wiring issue. It seems more like a software glitch or some sort of interference causing the battery to lock out.

Has anyone else experienced something similar or have any insights on what might be going wrong?

Thanks for any guidance you can provide!

 

[Johnhallycr]

Did you resolve this issue. I suspect not.
Although the SPH inverter on the face of it seems pretty good it’s not very flexible with other batteries. I had many conversations with Growatt and they pretty much told me that I needed to use their batteries. After many many hours modifying different battery settings and even changing batteries I came to the same conclusion, it’s the inverter thats the weak link. During solar charging the inverter will continue to charge the battery it does not take any notice of the Soc and relies on the battery BMS to shut the battery down, hence the error. This is not the same when charging from the grid, the inverter will control charging with Soc detection. Sounds crazy but unless Growatt has changed anything in the last few month that’s how it works.

I think this is what you will see over the next few months.

During days of light sun and gradual charging all will work okay
When the sun is strong and your battery reaches full charge with strong sun you will get errors.

If you get these symptoms I suggest dumping the inverter and get a different one.

 

[gooffy]

Hi @vikumj
Have you solved the BMS error 301 issue?
I have the issue with mine, and exactly after 3 days after Growatt remove the error it came again

I have the SPH3600 with a Rosen 10kw Powerwall.

The battery is new and has only been connected for a week before I got the error the first time.
My inverter is 1 year old and has been running perfect without battery connected.

My inverter will charge the battery to 100% when I get the error and will not discharge the battery again.

I hope someone have a solution for this.
Have a good weekend