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.
This review is from: Powerhorse Portable Generator with Electric Start - 9000 Surge Watts, 7250 Rated Watts (Misc.) Update Jan. 4, 2012... I found out the motor for this generator is manufactured by a company called Ducar. I found this out by speaking with a customer Service rep at Northern Tool.