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WOT == Wide Open Throttle. You want the control all the way in the 'govern' position - that should allow the engine to spool up to the point where the governor takes over control.

Sorry about being misleading on the charging of the battery; I was under the mistaken impression that all MEP units had the ability to charge their own battery.

Your battery should be charged when the genset is running; there’s a DC charger circuit that should accomplish the task of maintaining the battery charge. Sounds like we’re on the right track WRT the voltage output failing – you’ve either got soft batteries that aren’t being charged, or a...

One other thought; is your 24V battery up to snuff? I'm speculating that if it is not, or perhaps your 24V battery charging system isn't working, then your generator might have trouble maintaining field current at full load and causing the output voltage to drop or fail. Just a guess.

Not being able to maintain frequency sounds like a governor issue. You might see a change of a few Hz from no load to full load without touching the throttle, but it shouldn’t drop off the scale when loaded, nor should it race when the load is removed. Now, frequency should have no first...