It's 1000 watts at 110v AC but I run 3 - 25 amp DC power supplies. I can charge 3 - 5s4p packs at 8 amps with no problems or 4 packs at slightly less amps. There's really no better option for easy, large battery pack charging. Particularly if you hang out at the field for 5 or 6 hours or need to attend an all day event.

-- Kyle