Propane is same in both tanks and is reduced down by your regulator. I have only delt with it on tractors and forklifts. You don't get quite as much run time but in a storm situation that's least of your worries. Also a big plus is you don't have gas sitting in tank and carb for long periods to gum up. If you get it converted you could get a hose and adapter to charge small tank right off your big tank also.