What kind of medical equipment if I may ask (If you do not wish to answer I will understand)
Most of that can run easily off a PSW inverter and with enough storage you don't need to run the Genny
You can get GC2 Pairs for about the same price as Group 27 pairs but while a Group 278 MARINE/deep cycle is just under 100 amp hours (200 for a pair) with perhaps 20-25 usable amp hours each the GC-2 can be 210-220 or 230 amp hours (mine are 230 and half of that (115 in my case) usable that is over 2x the usable power for the same price...
THIS is why I like GC-2 pairs by the way. True you need to water'em (Distilled only) from time to time but the difference in cost is amazing.