Where there is no other electricity source or when there is not enough amperage, a generator provides what is needed. They can be a primary source for businesses, homes, fairs, or movie sets but are often used when the power goes out in a natural disaster. Mounted on a trailer, one of these can power a commercial site that is small to medium sized.
Portable generators are like stand by electricity arrangements which are capable of powering most of the standard 120/240V electric equipment like fan, blower and lights. Some of the portable generator models are equipped with automatic idle control in order to conserve fuel and lower noise levels. They are not very heavy and can be moved or carried by one or two people.