If you want to grid tie, it’ll need to be inspected to some degree at least. So hiring someone licensed to do that is in the cards.
The beauty of AGM’s is that that they don’t “need” to be housed in their own vented space. Lead acid and the like, do. Of course local building codes can affect that. Off gassing during a normal charge in negligible, during a maintenance charge they can off gas somewhat. You wouldn’t want them in the kitchen naturally, but certainly in a garage or a utility type room. If you’re sensitive though, that is certainly a consideration.
Without subsidies, a lot of solar installers wouldn’t be. Maybe you’ve noticed in your area all the solar co.’s coming and going.
With that said, I’d recommend checking around to see if someone from one of those outfits might do side jobs just like you’re describing. Or maybe an ex-employee that has their own gig in the blue collar trades now that might help you out. I see plenty of that happening especially in rural areas and it’ll save you a lot of time and probably money. They might have access to some cheaper second hand equipment as well.
I’ll post some links after I narrow down some appropriate sites. Basic solar isn’t that hard to comprehend or even set up a nice system. It’s dealing with all the codes, the myriad of equipment options and the potential lifestyle changes if you want to go hard core solar.