This is my setup. Runs off of 12v DC, or an AC charger, holds my Beelink Ryzen PC, powered USB hub 11 port, DC Step Up Converter 20V, small fuse box inside under the PC with lots of 12V DC outlets of every kind. There is an AC inverter in there just in case. The 12V battery has a Bluetooth battery alarm, the plastic box has a GPS receiver and DC power monitoring display on top. It uses a high gain 2.4Ghz directional antenna via WiFi adapter connected to the PC. This thing is my Swiss army knife.
I connect to it via Remote Desktop, on my main PC, runs on all 3 of my monitors. PCs comes with Remote Desktop built in. When at a remote location, I'll setup a hotspot from my phone, and use my laptop from the car.
This setup runs dual instances of NINA and PHD2. Been using it for about a year now. Cost about $375 to build, including the PC, and 40Ah of lithium batteries (12hr battery capacity), charger and everything. Worth every penny.

