Sounds like a very cool set up. Adding a power wall (or batteries and gear to switch them) will make a huge difference.
My roof doesn't qualify for government or power system help so I'm essentially screwed, blued and tattooed. We do have a brand new 'cost sharing' program from the gov which starts Thursday for most people.
I'm really looking forward to your production/cost reduction report. I think 600 kw with a power wall would darn near take me to zero from the utility. I think it would take 900 to be sure but...
It'll take time for the stats to show sw bbers but coming into summer will help as the AC will be on during the day. I'll compare against last year and see what I see. I think it'll work out really well though.
A shame your house doesn't qualify though huh?