esp32 has a deep sleep mode, easy to use, works on my linux since it uses the arduino ide, but i didn't find a nice board, so a lot of soldering....
my victron solar charger also has that smart output, but my inverter pulls to much current for it...
if the battery gets to low the inverter switches off, but it makes that neverending beep sound, hope the new one is not so loud..
i really would like to be able to read my voltage over the internet, to get an alarm on the cellphone...
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So you made a PCB? Ah, ya I'm only powering my laptop, phone, and at times LED lights/fan. I just have a cheap 175W inverter. That'd be cool. Are you going to have a separate cell radio hot spot in your van in addition to your phone then?
due to the wires i only go with 300W, bought a new one which has a batterie charger and networkswitchover included! for only 120€ => 130$
wifi depends on the country, i have an old router with openwrt running, i can connect it as client to any open wifi, it has a better range than cellphones/laptops, at the same time my private wifi is running on that router, where all my devices connect to, so when i come to a new location i only need to setup the new connection on my router. it works best with a router with 2.4ghz & 5ghz, openwrt doesn't support all 5ghz chips.
When i have no wifi I connect my devices manual to my phone, i use prepaid cellphone internet if i am in a country for a few weeks, in europe roaming is only free for short time travels. In sweden i got a free travelrouter with the simcard, but it only works with the swedisch sim card...