I'm using a grid-connected EasySolar-II GX 24/3000 with grid meter, solar, SmartLithium battery and setup as ESS configuration (all with latest firmware). Everything in the system works fine, however..
In previous topics I read about humming/buzzing noise coming from the inverter with almost zero loads and connected to the grid. The noise is not so loud, but when I go to sleep at night (and ambient noise is quiet) this buzzing sound starts to get very annoying. It is my understanding that specifically the UPS function ensures constant activity (synchronization) of the transformer with grid and AC-out.
In the system I use the UPS function is not necessary and would therefore like to disable it. However, in VEConfigure (3) the UPS function checkbox is not visible. This may have to do with the ESS configuration (and UPS is enabled by default). Is there a way to disable the UPS function in this ESS configuration?
At the moment I have solved this buzzing 'problem' (I know, it is really just a physical property of the toroidal transformer) by just disconnecting AC-in and I prefer not to do that. Thanks in advance.