I think technically these are invertors. We had units similar to these on a couple fire trucks our department bought in the mid 80's. I don't remember what brand the "generators" were, they were mounted in the upper back side of a storage compartment. We used them to run scene lights, all we had to do was flip the lights on and the "generator" worked.
Here is a link to a similar unit. http://www.phonetx.com/32082000.html
If you can get it for a $100 grab it. The place I linked to is selling them new for $1900
As a matter of fact if you don't want it I'll buy it if you can UPS it to me.