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.
He did tell me that the cost for a 20kW Generac 5896 with install to a single box service was $8417, $9600 with two box service and the price did not include the cost to perform the NG hook up, any line work or meter issues. Holy Shit Batman...So, the generator is $4130 and install is $4287 without NG hook up...