powering a MacBook Pro from a car battery

I use a MacBook Pro from a remote location where my only source of power is a GoalZero solar kit (Sherpa 100 + Nomad 20). This is totally inadequate for a full day's work, which is what I'd like to be able to do from this secluded place without having to make the hour-long trek into town with all my gear on my back to work from a noisy internet café.

I'm looking into buying a small wind turbine to hook up to a car battery, since it's very windy here. The car battery trick is a favorite in developing countries and I hear they're pretty cheap, but I have no idea how to safely power my mac from that. I have the possibility of storing all this in a small lockable shed when I'm not here, but it does have to be portable (from wherever I use it to the shed and back).

Also, would I need an inverter of some sort?