Portable AC Power - What Do You Recommend?

For years we've been using a Xantrex portable power pack, as we talked about in our Portable Power for Video Surveillance post.

It's done pretty well, but it's starting to wear out. Before I go out and just buy another one, I wanted to ask what everyone is using (if anything) these days? Is there a newer, better option?

It needs a duplex (at least) 120V AC receptacle, and wheels, and can't require fossil fuels. Those are pretty much my feature requirements. It should be able to power an 8-port PoE switch for a few hours. Yes, I know that varies, but generalize with me.

And yes, I know that I could likely take the Xantrex apart and replace the battery, but it may not fix my issues and it may be more work than it's worth.

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