Join Date: Aug 2018
Location: Lowell area, MA
Mentioned: 3 Post(s)
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I've always assumed the limits were due to the inverter boards getting too hot when outputting above the running wattage.
My EU2000i can put out the starting (2000W) for up to 30 minutes before overloading, vs the 1600W running wattage. Whereas, from what I've read, the Yamaha 2000W inverter can only produce the 2000W for about a minute before overloading, vs the 1600W running.
That, to me, implies it's an inverter limitation. FWIW, my starting rating is about 25% above the running, vs the Champion at 10% above running.
But your point is a good one. The engine will produce less power on propane, as I understand it. But if it was just the inverter getting too hot >3100W, then perhaps the starting watts could be the same as running, if both were under 3100W. Since that's not the way they rate it, maybe it does also have to do with engine limitations?
It may depend on more subtle aspects. If the inverter gets lower voltage from the alternator, on propane (due to less torque, perhaps), then maybe it's because the input amps to the inverter are the same as at full output on gas. And electronics heat often relates more to amps, vs actual power.