Generators are machines that convert mechanical energy into electrical energy. They are usually used as a backup power source for a facility’s critical systems such as elevators and emergency lighting in case of blackout. However, they do not offer protection against utility power problems such as overvoltages and frequency fluctuations, and although most can be equipped with automatic switching mechanisms, the electrical supply is interrupted before switching is completed, so it cannot protect against the damage that blackouts can cause to expensive equipment and machinery.
If you use a generator to backup a UPS during extended blackouts, the U.S. Department of Commerce suggests that it be rated at about 2½ times higher than the UPS it is backing up.
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