Looking for System Feedback

[claytonrex]

Hey all, new poster, but been lurking for awhile and consuming Will Prowse content. I am planning to expand my existing AC coupled system with a mostly DIY DC coupled system with partial backup. Hoping for some feedback on what I am missing, or if I'm sizing something incorrectly. I've put all the equipment I'm planning to use and wire guage on top of this helpful diagram for the 18kpv. Thank you all in advance!

 

[tacman7]

Complex system, I like to use a flow chart approach before the details obscure things.



I was wishing for something like that looking at your drawing.