My set up is a dewalt plugged into a five gal bucket w/ a screen on the inlet. On the hose side is a tube that runs down and curls on the bottom of the bucket. Tried one of those dust devils (the ones w/ the red motor housing) and was hard on the bees. The Dewalt has just about the right suction and yeah you better carry some extra batteries. They give you about a half hour of intermediate use (you have to shut it down and let the batteries balance themselves).
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.
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