Antique Generators for today

After visiting an old engine show, my son mentioned a Delco Lightplant we had seen demonstrated.  This old farm type generator produced 32v DC.  He pointed out the concept of using a 110v, 3600 RPM, AC unit was counterproductive compared to the Delco.  His point: conversion from AC to DC involves power loss as does conversion from 110 to 24 in our case.  He made sense.  We asked around and came up with a 1930 model Delco.  Our setup is dual...12v lighting and 24v through an inverter for everything else.  We added one of the 6v batteries to the 24v charging line from the Delco and voila, we had 30v on the incoming line with separate taps for the outgoing 12 and 24.  Next, we converted the Delco to propane by simply drilling out the jet and putting the propane right into the carb.  It runs fine, uses minuscule fuel and only hits about 1300 rpm.  Does it keep the batteries up?  You bet...and no EMP wories.  Maybe the inverter will fry but the Delco will keep on chuggin'.