I realize I'm new to the forum, but here's my 2 cents; I use an inverter to run an older Milwaukee sawzall and I could probable run 2 of them at once. The inverter is a 800 with 1600 surge that clips to the battery terminals with small alligator clips. Cut up a mobile home roof and it just got warm is all. We use a demo blade also and you can cut most material you come up against, whether it's metal or wood. Thanks for letting me put in some input,,, Mike