Kodak og-plus 5.48 5 kw @ 230 volts ac inverter with Pylontech Battery1 x US3000 Add Switch to 1000. Original BMS RJ46 cable supplied by Kodak. System worked fine since Feb 2021.

Below Pictures with added new Battery

Added 1 x 3000C battery Pylontech recommends to make the US3000C as master battery with ADD switch 1 on all others off ( Add switch upside down on this battery) Battery BMS Cable from Master Battery Port link 1 US3000C to Port Link 0 on US3000 slave.

Original BMS cable Rj45 from US3000C to Inverter.

After booting up warning 04 battery low however SOC Led on both Batteries all 6 LED on = 100% voltage indicated 53V also checked with voltmeter on batteries confirming the 53 Volts.

What could be the problem?

Have contacted Pylontech 20 June 2025 its now 11 July 2025 [##27857##] Your ticket has been created no response from them. Called Segen Solar they want help me, only accredited installer I am the end user. Tried to contact my solar installer to no avail no response.

My contact details. [email protected] Cell: 0724795166

On 7/11/2025 at 12:49 PM, AlfredSchmid said:

battery low

I know it is not permanent solution but try to change the low battery value or voltage

Thanks Esmail

On 2025/07/13 at 7:18 PM, esmail-kassir said:

try to change the low battery value or voltage

If battery type is set to PYLontech, that should have no effect.

Is the battery icon on the display flashing? That indicates that the battery's BMS is talking successfully to the inverter.

Hi Coulomb

Thanks for the replay. Will try next month. I decided to run without BMS to Inverter. Adjusted Parameter 05 to User Defined and parameter values to Pylontech specs. However made US 3000c master + ADD switch to 1 ( switch upside down hence position 1 is on the R/H side) as per picture previous post. Cable provided by Pylontech from Master Battery Port link 1 US3000C to Port Link 0 on US3000 slave. It is working perfect.

However due to no BMS to Inverter, the Battery Voltage reads correctly on inverter and measured with voltmeter. The only problem is at 100% charge ie 53.00 Volts it shows Battery Capacity 68% so the percentage is under reported by 32%.

Regards Alfred

1 hour ago, AlfredSchmid said:

Hi Coulomb

Thanks for the replay. Will try next month. I decided to run without BMS to Inverter. Adjusted Parameter 05 to User Defined and parameter values to Pylontech specs. However made US 3000c master + ADD switch to 1 ( switch upside down hence position 1 is on the R/H side) as per picture previous post. Cable provided by Pylontech from Master Battery Port link 1 US3000C to Port Link 0 on US3000 slave. It is working perfect.

However due to no BMS to Inverter, the Battery Voltage reads correctly on inverter and measured with voltmeter. The only problem is at 100% charge ie 53.00 Volts it shows Battery Capacity 68% so the percentage is under reported by 32%.

Regards Alfred

As your battery voltage is far lower than say a lead acid the inverter will always report a much lower SOC.

Hi Scorp007

Thanks for the info

On 2025/07/23 at 3:13 AM, Scorp007 said:

As your battery voltage is far lower than say a lead acid the inverter will always report a much lower SOC.

Yes. In this configuration, almost completely ignore the inverter's reported State of Charge. It's using lead acid logic, which is weak enough for a lead acid battery, and delusional for an LFP battery.

Just use the LEDs on the battery modules for a low precision but far more accurate and useful SoC.

Sorry for the late reply.

Thanks Coulomb