wiring diagram

I've been studying up on solar and electrical wiring and I think (hope) I'm pretty close to the right setup for my needs. Do you see any errors or omissions here that I need to fix?

TL;DR: Purchased van pre-built, modified sine inverter wouldn't charge my laptops, replaced with a pure sine inverter to the same results, paid a guy to redo all of my wiring, same behavior. I feel like there's something wrong with the way it's wired but I don't know enough about it. Long...