I think the main concept to consider is that the inverter is not a "load" on a typical "branch circuit" as far as the NEC is concerned. You should sort-of treat it as a "service entrance" instead. Well maybe the NEC doesn't actually make it out that way, but my point is that you have to be careful not to consider the inverter to be like an appliance. It's not.
8kW/325VDC = about 25 Amps. If you're thinking of #4 wire for the DC, then the losses are probably going to be very small. The ampacity is more like 50/60/70 depending on the type and if you go with aluminum or not.
Depth of burial, conduit protection, location relative to other services, driveways, etc. are important factors.
Another thought: wire insulation rating of 300V is probably not good enough. Consider the open-circuit voltage of the array with the inverter disconnected - what's the maximum voltage that could occur? You may be specifying an expensive type of cable for the DC runs.
I'm going to go with aesthetics in this case, just to start off: Inverters are a bit noisy, especially under load, so if I had the choice of putting one (a big one) in my house or in the shop, I'd go for the shop. It allows you to be more utilitarian with the installation, too.
I flipped through my NEC book and now I find article 705...
The point of interconnections is required to be at the premises service disconnecting means.
Meaning that you need a kill switch beside the breaker panel where you feed in AC, even if you have another kill switch beside the panel array.
... but the bulk of solar PV code is article 690.