a pair of 6 volt Trojan t-105's wired in series is a *very* common upgrade if you have the space for them, or know how to weld, or are willing to pay someone to fabricate you a battery box for them. They have bigger ones too depending on your amp hour needs / and space. You would need an inverter strong enough to run your microwave and that's obviously a pretty serious drain on your batteries depending on how much you use it, you may even want to invest in a backup inverter/generator for those times when your power demands include the microwave. We love camping off grid, but in the summer, not being able to run the AC at all is a major problem throughout most of our camping areas. Our camper turns into an oven. totally depends on where you guys go of course. We bring the generator as a plan B for that, and a ton of other reasons. Always good to have options.
I'm 100% a coffee snob, but when camping off grid, we make our coffee in a french press that just requires us to boil some water on the stove. You might want to pick up a 12 volt coffee maker so you have one less thing to need an invertor for if you still want the 'drip' machine.
Envious that you have built-in solar. I would have definitely paid for that option if I could have.
2016 27BHS Elite
2012 F-150 EcoBoost / Max Tow (Sold)
2017 'Blue Jeans' 6.2 F-250 Lariat 4.3 gears.