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martin-van-biljon asked

VE.bus voltage high and not stable causing output voltage to be unstable and trip

We have a 5kva MP setup with a 5kw fronius grid tie inverter.

We see the ve bus voltage to be very erratic during sunny hours of the day when the battery is full.

The battery voltage is stable but the VE.BUS voltage go as high as 64Vdc, causing a output voltage imbalance and the inverter trips out.

It is a 5kwh BSL battery with comms to the gx device.


What can cause this issue?dc bus.png,unstable-output-voltage.pngdc-bus.png

MultiPlus Quattro Inverter Chargermultiplus ve.busFronius
unstable-output-voltage.png (38.0 KiB)
dc-bus.png (47.2 KiB)
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Alexandra avatar image Alexandra ♦ commented ·

@Martin van Biljon

Are you feeding back to the grid?

Do the spikes happen at the same time as large loads dropping off and high PV production?

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