Ok so lets look @ worst case the transformer blows near your house or cables are stolen again how do get the batteries charged I assume this not your only back up plan ?
Or are you trying to lesson your load on the grid any pay less for consumption ?
Worst case scenario - Use Genny to charge batteries (like I do for the 2kva inverters now). Not ideal but it works. Not interested in the solar BullSh1t.
EVEN WORSE WORSE case - get my handy okie guy dude that works by me, to load it and take it to the in-laws or friends or somewhere with electricity and charge it.
Total blow out of the whole of South Africa - use the Genny to charge it or just run on genny power like I do today, the genny works like a charm runs everything don't have an issue. I keep diesel reserves on my property secure and my handie okie, makes sure he takes care of it so it doesn't separate.
Every month the Genny gets a little service, oil's etc etc etc and every week it runs (even if there is no loadshedding) to keep it healthy.
You can't plan for each eventuality
Knowing what I do whilst trying to help our Eskom friends right now we going to go from 3 hrs to 6 schedules.
Medupi Gen 6 will be synced in by Oct, but that will only supply power to allow for partial maintenance then Gen 4 comes in next year Oct easing for 80% maintenance. Then following that it will be online.
I say Oct cause the due date is June but knowing how its going looking at internal project plans its Oct.