A client has a Quattro 10kVA inverter which has been troublesome for quite some time in that the switchover time when the grid fails is too slow to prevent items like decoders and WiFi routers from having to reboot. But now there is a new problem.
The AC output voltage fluctuates and causes lights to dim, ceiling fans to slow down and refrigerators to complain. sometimes there is a complete loss of output for a split second. My client measured an output voltage of 180V instead of 230V. Yet VRM Portal shows a constant 230V with no signs of any dip.
I have checked all the incoming and outgoing AC wiring and it is all good with no loose connections or signs of overheated wiring.
Does anyone have any suggestions?