I upgraded the software on my Quattro and now when I disconnect the mains, there's a pause in supply and all the household appliances and computers etc.switch off. In 7 years we've not had this problem. I have a contract at another house on the same street and we get free leccy between 19:00 and 21:00, so we obviously take advantage (a hidden cable).
Is this a known issue?
Did you reprogram the inverter after the firmware upgrade?
Yes, I had to completely start from scratch. I don't remember there being an option to alter the delay when switching off mains though. Is there one?
Hmm, the problem with enabling ups function is when the mains is connected and the sun comes out, the solar is ignored and the mains favoured. On a day with sun/cloud/sun/cloud I have to keep switching it over to take advantage of the solar power.
It sounds like you want ESS mode instead - https://www.victronenergy.com/media/pg/Energy_Storage_System/en/ess-introduction---features.html
Out of the box, a Multi will think that when an AC supply is connected, you want to use it to charge the battery.
It is also possible to adjust this behaviour with the AC input controls in VictronConnect - https://www.victronenergy.com/media/pg/VE.Bus_Configuration_Guide/en/description-of-settings.html#UUID-74fa9bfe-3445-a4d3-b949-c3dbd2e594a5
