Inverters are hellish expensive! Charge controllers too. :-(

You don't need either of those for a minimalist system to charge your laptop - just a 12v panel, a "laptop car charger", some wires, and a "cigarette lighter" socket.

You can also use this system to run things like battery chargers, xenon lamps, fans during a power outage. I'm using something not too different for my laptop right now.

Just a thought.

Don't spend money you don't have, but you could certainly build a minimalist offgrid system for less than the cost of one laptop battery.