Sorry for answering so late - just came back from a trip to Greece.
Basically you need 2 more things in addition to your usual tagtool setup - a good battery and a pure-sinus converter.
Battery: We usually use deep-cycle batteries. 12 Volts and about 120 Amp hours - the latter means how long you will be able to use it. And it also means how heavy the battery will be.
Pure-Sinus Converter is important to use because of the Projector. It needs a stable conversion.
That´s basically it.