Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Most forms of Uninterruptible Power Supply (UPS) are battery-powered. These are ready for immediate use at the instant that the mains electricity fails, but the small amount of stored energy they contain makes them suitable for a few minutes of use only. To get uninterruptible and continiuous power supply they need a diesel-generator back-up system. Diesel rotary UPS devices (DRUPS), combine functionality of a battery-powered UPS and diesel-generator. When mains electricity supply is within specification, an electrical generator functions as motor to store kinetic energy in an electro-mechanical flywheel.

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