I have an MP2 installed with solar, battery and mains/grid connection.
When the mains fails my computer turns off? (Lights etc seem to stay on, I don't even notice a flicker, but my computer restarts.
This shouldn't happen.
However, when I open Ve Configure, I see the UPS function is no longer there under grid? I assume this is because I have ESS mode enabled?
Starting with the basics, are you 100% certain the computer and the lights mentioned are indeed on the same circuit? I was unable to select South Africa for the grid to see if the UPS checkbox disappears when that grid is selected. But if the UPS function wasn't working, and the lights are on the same circuit as the computer, the lights would have turned off as well.
Have you measured the voltage during an outage? It may be that the computer doesn't like the voltage produced by the MP2 for some reason while the lights are less sensitive.
The UPS function is always enabled when ESS is selected for SA. It is because the grid code sets the transfer time. There is a small dead time when the system switches on or off grid.
It is possible that your computer power supply is on it's way out, I have quite a few Victron sites in SA all with SA grid code and none of the computers drop out.
I have a feeling that LOM detection is way too low. Surely anything under 210V should count as LOM.
South African grid spec is 230V +-10% so 207V-253V but voltage dips can go as low as 195V as long as they are less than 10s
LOM is not using voltage but rather frequency shift, the inverter try's to shift the grid frequency constantly, if successful then it triggers LOM disconnect. This is really fast 2-20ms but can sometimes let the voltage sag if the grid isn't cleanly disconnected.
If I kill the mains breaker, it will be quick, if it's load shedding and they kill it, I'm sure the voltage or frequency slowly drops, causing the Victron to kick in Slowly.
@Dylan Hyslop Do you have AC in ignore selected / active by any chance? I accidently had this option selection along ESS and when I had to isolate the grid connection for maintenance, there was a flicker of the lights and appliances would restart because the power cut off for a few milliseconds after the grid disconnect. When i removed the AC ignore, the problem went away.
