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2. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   A problem in the combination of a double-conversion UPS and a generator is the voltage distortion created by the UPS. The input of a double-conversion UPS is essentially a big rectifier. The current drawn by the UPS is non-sinusoidal. This can cause the voltage from the AC mains or a generator to also become non-sinusoidal.

3. Diesel rotary uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Diesel_rotary...

   Diesel rotary uninterruptible power supply devices (DRUPS) combine the functionality of a battery-powered or flywheel-powered UPS and a diesel generator. When mains electricity supply is within specification, an electrical generator with a mass functions as motor to store kinetic energy in an electro-mechanical flywheel. When mains electricity ...

4. Emergency power system - Wikipedia

   en.wikipedia.org/wiki/Emergency_power_system

   A backup generator for a large apartment building A backup power fuel cell for telecom applications A portable emergency power generator in a shipping container. An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply.

5. Standby generator - Wikipedia

   en.wikipedia.org/wiki/Standby_generator

   A standby generator is a back-up electrical system that operates automatically. [1] Within seconds of a utility outage an automatic transfer switch senses the power loss, commands the generator to start and then transfers the electrical load to the generator. The standby generator begins supplying power to the circuits. [2]

6. Transfer switch - Wikipedia

   en.wikipedia.org/wiki/Transfer_switch

   When utility power returns for a minimum time, the transfer switch will transfer the house back to utility power and command the generator to turn off, after another specified amount of "cool down" time with no load on the generator. A transfer switch can be set up to provide power only to critical circuits or to entire electrical (sub)panels.

7. Hospital generator failure probed after Eowyn caused power cut

   www.aol.com/hospital-generator-failure-probed...

   An investigation is being caried out after a hospital was left running on battery power when its back-up generator “failed” during a power outage in the midst of Storm Eowyn, MSPs have been told.