Here’s a quick and easy explanation.
An inverter is a backup power unit. Most people use a generator. An inverter accomplishes the same goal, and is a viable alternative to a generator.
Whereas a generator runs on fuel, an inverter runs on a battery (or multiple batteries depending on the size of your inverter).
The inverter’s job is to take the stored energy from a battery (which is DC power) and convert it the type of power which your house/office runs on (which is AC power).
An inverter is a device which is used to convert between Direct Current (DC) and Alternating Current (AC)
most people use a generator. An inverter accomplishes the same goal in a way that is more beneficiary in many different aspect.