[folivier]

Mark mine is the multiplus not the new 11. Read up on that one, I'm not certain that it gives you 2 opposing legs of 120vac on battery power. It would be great if it does and I'm probably wrong but check anyway. There is a facebook Victron group with lots of info. I'd ask there. https://www.facebook.com/groups/victronusergroup/
You might also consider an auto transformer or step up transformer. These are much less expensive and IIRC give you 220vac from 120vac source.