Portable Power Supply for Car Shows - need recommendation

[JB in Irvine]

I have a 12 volt powered vacumn cleaner that I take to concours events.

I would like to have an external power supply and not have to connect to the cigerette lighter.

Any recommendations?

Thanks in advance.
JB

[Pats300zx]

I tried something like this last week at the International Z show. I had a small vac (similar to the Shark). I used an inverter plugged into the cig lighter. It didn't produce enough power for the vac

Thank god I brought a 100ft extension cord...

[JB in Irvine]

Pat...what I am after is different.

My vacumn cleaner already runs off the cigarette lighter fine (12 volt).

What I want is one of those portable jump start batteries that often provide a 12 volt outlet.
Something like this..

Anyone have any experience with these?