I've just completed a 3 phase installation using Multis. Everything worked well except how to power in event of a grid outage. We have a fairly reliable grid here in the Australian country but it does go out from time to time.
The setup runs on its own energy 95% of the time. So put these things together it wont be often that the grid is out and we dont have our own power.
The 3phase multis need 3 phase input to charge. 3 phase generators are significantly more expensive than 1 phase. But I just noticed that 5kW VFDs (1P to 3P) are quite cheap.
Can I use one of these? ie a VFD on the output of a genset?