200+ watt solar panels off-grid

I have noticed that small kits are outrageously priced compared to the full sized panels without even knowing what the components are. Even information seems to be scarce about off grid setups with the large modern panels. With contractors selling extra stock on craigslist, golf carts everywhere in florida and mppt chargers all over ebay I guess I'll be building a 4 panel setup near blind based only on specs.
So far stringing in series yielding 120v DC, a 40A mppt with 150v max input and 8 225ah 6v golf cart batteries in a 24v configuration.
Basing 24v on the availability of small trucker dc-ac inverters and other stuff that can be had at a truck stop. I'd rather have smaller inverters based on individual load than a oversized pure sine and use dc-dc conversion where appropriate.
$1900 for the panels and mppt and desulfate some used batteries from a dealer, recycle yard or golf course until matched.

I found a big dealer in miami with new 220watt panels for a little over $300, worth the drive.
Now planning for 6 panel, 250watt max for the more common 60a/1500w mppt controllers.
2 strings of 3 panels in series for a square pole mount and keeping the open voltage under 150 mppt max input.
Also adding 4 more batteries to keep under c/10 charging.

I estimate cost at $7-10k just to bring a pole to my property, while the price of solar keeps dropping.