Xringer you did it right. 48 volt everything! Me, I didn't understand the losses with pwm when going from 48v panels to a 12v battery system.
Live and learn!
For my next system I want to wait until there are better batteries. The air/iron batteries look good. 75% discharge acceptable instead of 20%. 25 year lifespan vs 7. But they're still incredibly expensive. Hopefully that's a technology that will follow the panel price drop. I paid 1.70 a watt (delivered) for my last two panels and this year it would be closer to 1.20. Nice!
The mppt controller is my favorite toy this year. With "live data" tracking via the web, it's the first site I go to every morning.
It's really shown me how robust and powerful these systems are. It's noon and I'm already throwing sun power away to the tune of like 500 watts/hr ... the system looks to be fully charged by one. And I've been running extra heavy loads this a.m. cleaning up the house...
I don't think you would have any trouble running your A7. Let us know.