Nee some guidance here please guys as I’m seeing behavior that points to a potential issue and need to know how to ascertain where the problem lies and fix it.
The last 2-3 instances where the grid went down, I got the idea that my batteries (4 x 12 V 200Ah AGMs - bought April 2020) may be faulty, or there is a problem on the inverter. (Victron Multiplus II 3 Kva 48V)
When the grid goes down, we are immediately aware of it as my son’s PC and screen shuts down, and the kitchen light dips.
Now this changeover to the inverter power used to be seamless and one was not even aware that the grid went down.
Why I’m thinking it could be the inverter - the kitchen light is only 2 half meter fluorescent tubes which pretty much draws no current. Why on earth would this light dip? Granted, it is a troublesome light that actually consists of 4 tubes, but when all 4 is replaced, the outer 2 lasts a month and then pops.
Why I’m thinking it could be the batteries is because of the more heavy consumers. We can hear the dip in the aircons (two of them totaling about 1800W - fixed speed types) - this was a separate incident. Also to be noted is that my two fridges is on the same circuit as my son’s PC.
Our old 350W plasma energy consuming monster tv doesn’t even phase when this happens. Its only the aircons, the fluorescent light and PC (750W) we have observed does this.
So this never use to happen and the batteries are basically new being less than a year old.
Is there VRM portal data that one can study to see where the issue lies? Or must load tests be done on the battery bank or even individual batteries?
Where do I begin?