Hi, i just installed a 16 cell 48v 306Ah battery with a cerbo GX and Multiplus II 48v 5000VA. I have JK BMS that gives a SOC of 26% while the smart shunt / VRM shows 100% SOC. Can anyone help, it must be something in the config. [Screenshot_20250301_103639_BMS] [vrm]

The linked FAQ will tell you how yo set your SmartShunt, especially charged voltage. Shunt jumping to 100% If you have only just started the system and not yet charged it, the SmartShunt counts energy in and out of the battery so at start up it knows nothing about the battery state, it only star…

@Ludo and @pwfarnell , thanks for the quick reply! I will check it now. These are the settings i have [Screenshot_20250301_115442]

I think i found it. I manually set the SOC to the same % as the BMS and changed the grid metering to the Multiplus as i don’t have a grid meter yet installed. [Grid]

Maybe not, it’s back at 100% again, but it is charging.

[image] MrBlonde: These are the settings i have There’s your problem. You shunt has not been set up correctly. Read the link that @pwfarnell gave you.

Thnx! All good now. I will ready the doc to fully understand all the settings. Thanks a lot!

It doesn’t really charge a lot, it’s still on 26%. [Screenshot_20250301_201527_Brave]

Next stage is to make sure your Multiplus charge settings are correct, it is in bulk, not sure why that should be so limited in charge output. See section 5 of the manual. https://www.victronenergy.com/media/pg/MultiPlus-II_230V/en/configuration.html

Can change in this settings what measuremnts to use on VRM you will may see Multi / SmartBMS / BMS.CAN and the BMS.CAN will may be the most correct. In the picture bellow the RUiXU is BMS.CAN and is the only one Visible to get correct SoC. [image]

Thanks, great learning curve. I will read and check the settings tomorrow. I’ll be back!

SoC difference between Cerbo and BMS

DIY

MrBlonde 2 March 2025 07:36 16

Thank all fot the support, i created a new topic: New Multiplus II 48v 5000VA setup only slow charges battery

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SoC difference between Cerbo and BMS

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