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el-barto asked

ESS incorrect energy values in VRM

I'm in the process of building a ESS. At the moment I have a single MultiplusII on a 3 fase power grid. I'm using SMA home manager 2.0 and this software (https://github.com/Waldmensch1/venus.dbus-sma-smartmeter) as grid meter. I have a 15kw 3 fase solar converter. The VRM portal shows these systems correctly in my opinion. The MultiplusII is connected to L1.

2023-07-10-16-18-14.png2023-07-10-16-18-14.pngThe reported values of the solar converter and the grid meter seem to be correct. All the values reported for L1 seem also to be correct. The problem is L2 and L3 which don't have a multiplus. For example L2 reports as 3111W are generated by solar and 2150W are fed back into the grid. I would expect to see an AC Loads of 3111-2150=961W and a Critical loads of 0W. The same goes for L3
Is this a bug in the system or in my setup/config?


ESSVRMEnergy Meter
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2 Answers
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el-barto answered ·

When the solar converter is of the values seem to be all right.
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el-barto answered ·

Home Assistant connects to the Cerbo via modbus over TCP. It reports the same incorrect values as VRM, so I'd assume the cause of the miscalculation is in the Cerbo.
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