Multiplus II zooming noise that is very enoying at night. The zooming/buzzing is going through the entire house.
I have the feeling this is more the case when net connected. When I ran the inverter in island mode I also heard the zooming but typically when I had inductive loads like TL lights.
Anything that can be done to reduce the noise ?
In my setup the multiplus II is connected via AC1 IN to the grid, Nothing connected to AC OUT. It is configured to compensate grid loads above 2500w and I use the external AC clamp (the one with the phone jacket) to measure the grid load. At night, loads are never above 2500w so the inverter has nothing to do I would expect. I do see some small power being send from the inverter to the grid (0 to 40w). So I was wondering if the multiplus tries to compensate for inductive loads since at night my grid cos phi does deviate from the ideal 1. (arico in standby and induction cooking plate in standby). I found some cos phi settings in the grid page of the multiplus but I don't understand the options and couldn't find documentation. Not sure cos phi has somehting to do with it but it looks that at night when the multiplus should have nothing to do, the noise is the highest.