First I have never tried this on such a large load but theres no reason
it shouldnt work I have used this idea on small heaters in office
equiptement over the years.


Put in a LARGE diode, and a switch.

On generator the heaters capacity will be cut by 1/2 the recovery rate
will be twice as long.

makes thatr 5500 watt heater a 2750W heater well within your generators
capacity