You can see some photos of the charger at:
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The generator does increase speed to power larger loads.
The generator has a stepper motor with a linkage to the throttle. The control circuitry runs the stepper motor to control the throttle, and increases throttle when there is a higher amperage demand. I wonder if the generator would work properly with the linkage between the throttle and stepper disconnected. I could instead have some sort of a manual throttle linkage in place. I don't know if the generator would sense this as some sort of error and shut down, or if it would allow me to do it.
If I could remove the linkage easily, (so it could be hooked back up without any permanent damage) that might be interesting to try.