what is generator running watts and max watts
Rated watts describe the amount of power the portable generator can produce continuously. Maximum wattage is the power that the generator can produce for short periods of time. Motor starting is a good example of maximum wattage requirements.
At that point, the power required by the motor is constant. A generator can supply an additional amount of power for a short period of time to get a motor started. There is more information in this article. You can use the Running Watts to know the max amount of load you can connect to the generator. While you can use the Starting Watts to consider for the loads(reactive loads) that require an extra amount of power(for a short time) than they normally consume in order to start (i.e a motor, refrigerator).