Jack,
For an unpowered hangar, a battery and a solar panel will do nicely as
a power source... There are all kinds of 12v appliances that can be had
to make the hangar a better hang out... Check into some of the boating
chat groups for gobs of information - examples...

http://lists.samurai.com/mailman/listinfo/great-loop

Also, the RV chat groups will have info... I'll let you look them up...
And a google will bring up ten thousand web sites...

Besides the battery(s) and solar panel(s) you also need a charge
controller to keep from boiling the battery(s)...
A portable air tank is handy for large amounts of air, blowing things
off, inflating a flat tire, etc., and can be pumped up at home or using
a friends compressor...
I have an 80 gallon compressor in the shop but we still use the
portable tank all over the farm - and keep it charged and ready at all
times..
A 12v tire pump is great for topping off the tires and will run off
your battery system, or the car, etc... I've used it on the plane, on
the road, and out in the field many a time...
A camping, portable, 12v fluorescent light, will be useful...
The car/travel 12v coolers that use solid state heat convertors will
make a handy cooler for the barbecue party / saturday night at the
airport...
12v fans for the muggly days...

You will find that 110/220v power in the hangar is not necessary,
especially if that hangar comes with a higher price and a monthly
electric bill...

denny