Andorra drups system

Most forms of (UPS) can be either powered by or flywheel energy. These are ready for immediate use at the instant that the fails, but the relatively small and finite amount of stored they contain makes them suitable for short periods of use, typically in the order of a few dozen minutes to a couple of hours depending on the actual load. To get uninterruptible and continuous power supply, a diesel-generator back-up sys. [pdf]