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Huub asked

ET340 as 3 phase grid meter gives incorrect voltage readings

ET340 measures three phase grid input to control single phase ESS (on phase 1).

The voltage reading are strange and consequently the power input/export seem off

for example on phase 1 voltage is 217.9V; on phase 2 voltage is 230.5 V and phase 3 voltage is 259.7 V.

PV production is measured with a CT attached to Multiplus II on phase 1 and reports at the same time a voltage of 236V (ET340: 217.9)

recently my connection to the grid was renewed. Also the Multiplus was reconnected and changed from phase 2 to phase 1 (as it should be). Can someone guide me what steps to take to determine what is wrong with the ET340? Thanks in advance.

ps I tried to insert a jpg to illustrate the issue but I get the "Parsing response failed" message ...

ESSEnergy Metergridvoltage3 phase
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Huub answered ·

I see my question was mangled by autocorrect:

it should read: ET340 as 3 phase grid meter gives incorrect voltage readings

ET340 measures three phase grid input to control single phase ESS (on phase 1).

Really would appreciate suggestions how to proceed. For example how to determine the sense of rotation of the 3phase system. Was that inadvertently changed from right rotating to left rotating (or the other way around) when my connection to the grid was renewed and could that throw the ET340 in reporting incorrect voltages? If yes, how to solve that issue? Thanks in advance

@Jason - UK

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