Smk82
The AC3s cant charge batteries in a power cut, as the solar is seperate and without grid, they wont output. Unless you have some elaborate way to switch them in.
Hybrids are designed to do this. Maybe better with Hybrids.
ALso, the EPS cant be paired up. You would need some circuits on one Inverter, and others on the other.
On mains it is fine, however once the grid fails, there is nothing to syncronise too, so they "Free run" so will go out of phase with eache other, causing isues, at best trip the breakers, at worse, damage the kit.
Ive not heard of any work to keep them in phase with each other on EPS. Alothough it is possible, as this ishow grid generators work, they are all in sync with each other