A baby cow is called a calf. Adult male cows are called bulls. Adult female cows are called heifers until they give birth; after they have given birth, they are called cows.
As long as there is a fuel supply of natural gas or propane, a well-maintained backup generator will keep running. If the Generac generator is running on propane, with a 500-gallon tank, it should run 24 hours a day for over a week. How loud are they? Generac generators are very quiet.
A Generac generator may fail to start up when the on/off switch is in the off position, the battery is defective, a low level of gas is in the fuel tank or when the spark plug is worn out. To resolve this, turn the on/off switch into the on position, replace the battery and the spark plug and fill the fuel tank.