Matt,
Used a cordless Dewalt volt for 2 seasons. It supplies enough vacuum, but as 'honeyman46408' suggested, it takes more than one battery. On more than one occasion a large cutout or swarm was almost too big for my power resources. At one large cutout I had to run after a couple of long extension cords to finish the job. The cordless part of the vac quit at the end of last year, so rather than buy another cordless I did as 'brac' suggested to you and bought a generator for this year. Now I'm ready for any size and location.
Arvin