Maybe someone else has experienced this and have found a solution.

16Kw single phase inverter

7 x svolt batterys that use PACE bms all connected and communicating with inverter using "00" pylon configuration.

The li ion info on the inverter displays the bms data perfectly BUT the main screen on the inverter is using a different value ( i can only assume a value calculated if you had no comms)

It's also using this same SOC for my time settings.

I have been in contact with DEYE who has upgraded the firmware which hasn't solved anything.

Deye now suggests it's a battery firmware issue which I cannot believe.

Any ideas or perhaps pace bms available?

 

20 hours ago, Deondti said:

Maybe someone else has experienced this and have found a solution.

16Kw single phase inverter

7 x svolt batterys that use PACE bms all connected and communicating with inverter using "00" pylon configuration.

The li ion info on the inverter displays the bms data perfectly BUT the main screen on the inverter is using a different value ( i can only assume a value calculated if you had no comms)

It's also using this same SOC for my time settings.

I have been in contact with DEYE who has upgraded the firmware which hasn't solved anything.

Deye now suggests it's a battery firmware issue which I cannot believe.

Any ideas or perhaps pace bms available?

 

It is the P16S100A (PACE) BMS?

If it is, this BMS will report the battery pack with the highest SOC to the inverter while charging and the battery pack with the lowest SOC while discharging (when using comms).  Unless there was a very recent change in the firmware, this BMS does not report average SOC values.

When at all packs are at 100%SOC and no longer charging (at rest), are those two values (the 95% and the 87%) the same, ie does both report 100% (or 99%) SOC?

Is the total available capacity correctly set up in the inverter settings (total capacity of all 7 batteries combined)?

Is this a newly commissioned system? If it is first charge to 100% and let the cells balance for a few hours, then start cycling en see if the difference improves.

If it is an older system, I assume you regularly charge to 100% SOC?

That's is the correct model, yes.

 

I had a look and while charging the "battery soc" on inverter does not match soc any of the battery's. Battery SOC on the inverter is always at 100% long before any of the battery's are at 100%

While discharging it also does not match any of the battery's.

 

It's also not a average value of the 7 battery's, charging or discharging.

 

The li bms value reported by the bms is infact the average of all the battery's 

 

It's as if the inverter is determining SOC based on voltage solely.

Infact I can change the setting to based on voltage and the inverter value stays the same as when i select Lithium.

 

Remember I stated that the li bms values read by the inverter is correct and 100% of what it should be. See my photos.

The inverter is simply using its own calculated soc.

 

Edited December 26, 20241 yr by Deondti

Tried a full factory reset and restart on the inverter? 

I just discovered that "battery capacity " has a effect , perhaps some kind of offset

Issue is deye has a calculated battery capacity which changes , when battery capacity is set to near that value it works correctly. In my opinion this should be ignored if lithium battery is used.

Still sounds like a deye firmware issue in the deye to me

On 2024/12/27 at 8:21 AM, Deondti said:

Issue is deye has a calculated battery capacity which changes , when battery capacity is set to near that value it works correctly. In my opinion this should be ignored if lithium battery is used.

Still sounds like a deye firmware issue in the deye to me

Hey, I have exactly the same problem with my Deye inverter. But I don't understand how you solved it, how the setting "battery capacity" affects the usage of BMS-provided values? Battery capacity is set to identical values in BMS and the inverter settings, how should I change it?
Did you try firmware update?
Thank you

I have the same problem, and I've checked the communication, and it's working fine. The BMS's SOC is displayed on the inverter screen just like it is on the BMS screen, but the inverter doesn't use it to manage the charge. I assume it has an internal SOC. My problem is that in winter, I need to ensure the charge is always at 100% because there can be many days without sun and with dense fog, and I end up depleting the battery and the inverter disconnecting (I'm off-grid). With the battery below 25% (according to the BMS), when the sun comes out, the inverter charges it at a mere 500W. But if I change the battery configuration to voltage, it charges at 7 kWh. That's why for the last two years, I've always used voltage in winter, and it adjusts the voltages according to the BMS's charge. I was thinking of writing to Deye to complain and explain these tests, but I think they'll just tell me to manage it with their new AI, and I'm not interested in that. I heard from an acquaintance who left the management to this new AI, and that it improved, but this acquaintance is connected to the grid and I don't think it's optimized, since by default these inverters always prefer to inject energy (Could it be that they have an agreement with the electric companies?)

This is a major problem. OP managed to solve it somehow, but I don't understand how.