[revnode]

> I only have a desktop.

Sell it. It's a paperweight for you right now. You can find a really nice open-box/used laptop for $300-400 that will allow you to work from anywhere. You can charge the laptop at a cafe or a library. $5 for coffee and you have a working space to take calls and work.

[hn_acc1]

DC-AC Inverter will let you run the laptop from the car as a last resort..

[precommunicator]

Usually there exist also dedicated car chargers for the lighter socket.

[Grimblewald]

will cost you energy though, making battery less reliable or wasting fuel. Best to charge where you get energy for free.