Self-excited generators respond to severe overloading differently than the power line. When overloaded, the engine is not able to supply enough power to bring the
electric motor up to operating speed. The generator responds with high initial starting current, but the engine speed drops sharply. The overload may stall the engine. If allowed to operate at very low speeds, the electric motor starting winding will burn out in a short time. The generator winding might also be damaged.
CAUTION: EQUIPMENT DAMAGE
RUNNING THE GENERATOR SET UNDER THESE CONDITIONS MAY RESULT IN DAMAGING THE GENERATOR STATOR AS WELL AS THE MOTOR WINDING.
It is always best to consider the items you are planning on powering and calculate their starting amperage loads to find out the wattage need at start-up. It is best to size a generator to 80% of its running capacity to help prevent overload, voltage drop and damage to the unit.
Owners Manual