One of my first setups was similar to that with only four 100a 12v marine batteries. I had the setup at the front of our garage so in a pinch I could idle the VW diesel outside and jump that to the marine batteries. We had one outage that was about 3 days that I did that for and even idling the wagon it was charging the 4 marine batteries about 50 amps (125 amp alternator), so it works but not ideal.
2013 S W/QC Mar of 2013
110k miles - 52.24Ahr - 79.88SOH - 71.33Hx - 227GID
2018 Tesla Model 3 SR+ 32k miles
3.3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 220k miles - 51 mpg lifetime