Both Onan models, the 5500 and the 7000, are pretty light on fuel usage. Obviously "half load" on the Onan 7000 produces more power than "half load" on the Onan 5500 so they are pretty close.
I found two NPS spec sheets and attached those as well.
As usual, there seems to be some "marketing" going on with the model numbers and spec sheets...
The NPS 5500 is rated to produce 41.6 amps and 120 VAC * 41.6 amps = 4,992 amps yet they claim a 5,500 watt capacity.
The Onan 5500 is rated to produce 45.8 amps and 120 VAC * 45.8 amps = 5,496 watts.
The NPS 6000 is rated to produce 45.8 amps and 120 VAC * 45.8 amps = 5,496 watts, the same as an Onan 5500, yet NPS is claiming "Max. Output 6,000 watts".
The Onan 7000 is rated to produce 58.3 amps and 120 VAC * 58.3 amps = 6,996 watts.
Generally inverter generators are rated to produce more power for shorter periods of time and the NPS is an inverter generator (meaning the gas engine produces electrical power used to run an inverter to produce the power actually being output.)
A 30-amp pedestal is rated to produce 3,600 watts when pulling 30 amps but really are sized for 80% of that
continuously, or 24 amps or 2,880 watts.
A 50-amp pedestal is rated to produce 12,000 watts (two 50-amp circuits) when pulling 50 amps on each leg but really are sized for 80% of that
continuously, or 40 amps per leg or 4,800 watts
per leg or 9,600 watts total.
But for the actual equipment installed in a Georgetown a 50-amp pedestal is overkill. If we all had three air conditioners and really large water heaters a 50-amp pedestal would make more sense. That's why DP's often have 10,000 watt or larger generators.
Does any of those differences matter in the real world? Maybe, maybe not. Most loads are intermittent so things are not all running at the same instant (two air conditioners producing cooling, a water heater warming water, a fridge cooling down, etc.) except when the motorhome is first powered on.
In addition, the residential fridges usually pull a few hundred watts versus a Norcold 1210 at 450 watts or a Norcold 2118 at 600 watts. Add to that the far better insulation in a residential fridge and a residential fridge is not only using less electrical power, it actually needs to cool down a lot less than an RV fridge does.
If you're worrying about 1 gallon per hour of fuel burn with either of the available generators you need to go fill up a 5-gallon can with gas and dump it a few times into the motorhome tank.
Quote:
My 2023 GT7 ( 36D7) came standard with the 7000 Onan generator.
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Good to know and that's more marketing, probably, because higher-end products should have high-end equipment. The GT7's came with residential fridges so their electrical power needs actually are slightly less than our GT5 with an RV propane/electric fridge.
Ray