As said -- if this is going to stay on the field, then sure. Put a 200W or so panel on the roof of the field shed, and few big deep-discharge batteries inside, then you can have a 12V (or 120V if you want) outlet on the side of the shed for whatever. The reason it'll work is because the solar panel is the expensive part, and all the time that folks aren't there and there's daylight, it'll be charging.
Given my analysis in
this post, and assuming, as always, that I got the math right, you could leave the solar panel at home and just put a deep-discharge battery in the trunk. Get fancy and charge it off of your car through an isolator circuit (such things exist, although I can't remember the correct name -- it's an RV thing). Or just charge it at home.
A 50A-hour battery (which is less than
this one, but that's the
very first one I looked at) should give you ten flights or so on a 64-ounce plane.
Working the math out in my head, a 200W panel would let you fly about once every 15 minutes if you have a 64-ounce plane and an efficient charger, an efficient charge controller on the panel, and it's really sunny (solar panels are rated for the power they deliver in full sun -- and cloudy days deliver way less light). A deep-discharge battery about the size of your car battery costs around $100, the solar panel costs around $500, there's only so many hours in the day to fly, so -- do the math.