I'm a little confused about Ford's literature on the runtime of the 2.4kw vs 7.2kw, it says 85 and 32 hours, respectively for the same tank of gas, at full output.
But does this mean that the 7.2kw can also run 85 hours if only subjected to a 2.4kw load?

 

Correct. That's how I read it too. If you don't use much electricity, it can last a week.

 

One more thing. The rated max output is probably only a peak rating not a continuous rating.

So if you plan on needing continuous 2.4, it's worth getting the 7.2 just because you'll get more power headroom to absorb the bigger peak demands from AC, fridges etc.

And the 7.2 is not that much more expensive than the 2.4.

 

Actually the 7.2 is a continuous AND peak. Unlike many portable generators that can handle surge load, the F-150 ProPower doesn't seem to be a fan. It's why you sometimes see complaints of a saw tripping even the 7.2kW systems despite having a running wattage far below 7.2kW. Hopefully future ProPower revisions offer better handling of surge wattage.

This isn't me saying ProPower is bad, not at all, I love mine. But it is a limitation people should be aware of and all the more reason the 7.2kW should be the goal, even if you aren't likely to think you will stress 2.4 in most cases.

OOS Motoring and TFL have stress tested ProPower at max 7.2kW over several hours and it never missed a beat. If I recall they were charging an EV. So it can handle continuous steady demand loads like a pro.

 

Yes. Or maybe even more, since it should be slightly more efficient.