Brucey
Velcro Man
Depends on if he needs ul1741 approval.I have a Victron 250/100 in addition to the two 100/600 in the garage - so in theory 300amps possible... of course I need to install stuff and still buy panels and batteries. I will get there, just slowly.... and today it was 9 degrees F inside the garage so not exactly working weather.... got 6 inches of snow and had to run the blower in the driveway, that took an hour.
A victron 450/100 would seem to be a viable alternative to the 100/600 as well.
Best bang for buck imo for Victron is multiple 250/100s and a ton of parallel strings but that could get costly on the pv wiring side.