Frequently Asked Questions - Generators

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FAQs > Generators

How large does the generator need to be?


In power terms, at least 1.5 x the size of the UPS for 'on-line' technology, and at least 5 x the size of the UPS for 'line interactive' technology.

Can I use a generator without a UPS


Yes, particularly for non critical computer systems. The main disadvantage is the time gap between power fail, and generator start-up causes the computer systems to re-boot.

There is also another gap in power supply when returning to mains.

This second gap in power supply can be eliminated using a syncronisation system whereby the generator synchronises with the mains before switchover using a make-before-break switching system.

Where should the generator be sited?


It is best to position it as close as possible to the UPS to reduce cabling costs. Out-doors provides the best siting, because of the noise and exhaust. A generator can also be sited within a building housed in a block room with sound attenuators fitted into the walls, and an exhaust duct to the outside.

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