None of Tripp-Lite's UPSes will provide more than the feed's amperage to their outlets. Actually, they provide less (15A unit provides 12A). At least on the spec sheet. You can push them into over-load for a few seconds before they shut down, so you can get closer to full service.

But the ones we use at work, SU3000RTXL2U, have a 120V, 30A plug (L5-30P), and can provide up to 24A to their outlets. You can get them for about $1100. (Yeah, I've pushed one of them into overload too.)
_________________________
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs
-Chris