If you let a general contractor like SunRun, Tesla, or Solar City do the sourcing, you will either get:
a) The older generation equipment for top of the line prices.
b) Top of the line equipment for obscene prices.
If the roof was 6/12 and had an easier geometry to work with, I'd have ended up paying closer to $14k for a 16.5kW system, which is an absurdly good price ($0.84 / watt) for solar, even if you compare it to a country like Australia. Smaller installers are more likely to take on semi-DIY projects like this at a reasonable rate that'll still save you money.
Here's my cost breakdown - https://i.imgur.com/lieB9XG.png
https://unboundsolar.com/solar-information/diy-solar
https://www.renogy.com/blog/the-ultimate-guide-to-diy-offgri...
You may also want to watch some YouTube videos about how other people have installed their own. Mostly they are off-grid, but there are a few grid-tied systems as well. For the grid tied systems I would recommend buying plans like dymk did. A bill of materials and a plan will help a ton.
Based on the kit DYMK showed in his breakdown I think he used SelfSolar:
I just rolled it myself and found suppliers for the panels, inverters, racking, did the roof CAD layout & branch structure, and permitting (single line diagrams + some paperwork) myself. Saved a bunch of money and ended up with a nicer install that way.