Electrical generators
Some electrical generators can cost hundreds of thousands of dollars depending on their capacity and what powers them. However, when public power goes down, these generators will fire up within minutes and electricity will return soon.
You'll calculate and implement your UPS power so that your UPS units will be able to keep your critical networking equipment operational during the time it takes for the generator to fail over.
Of course, the authority to purchase electrical generators for your organisation usually lies beyond your reach. However, for the sake of your networks, try to get involved. Scale (both in terms of economics and technology) is one of the many issues that tend to isolate administrators from the people who purchase and maintain electrical generators for an organisation.
To give you an idea of the scale we're talking about with generators, let's look at an example. In IT, it’s quite rare for us to buy a single UPS that's rated more than 1 KVA (about 0.7 KW).
A typical power supply unit in a PC is rated around 0.25 KW. However, an electrical generator can supply power as long as needed, unlike a UPS that becomes history within a few minutes.
Besides, while we talk in 1 KW terms for UPS units, we're talking in 1000+ KW or 1+ MW (megawatts) terms for a generator.
Figures C through H show pictures of electrical generators to give you a look at some of these various units.
Caterpillar electrical generator
Caterpillar generators shown to scale
Generic electrical generator
Kohler electrical generator, 275 KW
Cummins electrical generator, 2 MW
MultiQuip trailer electrical generator, 1500 KW
A must for preventing downtime
In most cases, electrical generators maintained by your organisation can restore power within minutes. Motors used by these generators take time to fire up, and until then, you have your UPS units to keep you going. UPS units that can supply power for about 20 minutes are usually sufficient. If you are responsible for networks that can't tolerate downtime, UPS units are a must for all of your networking equipment. This may include some critical-use workstations, printers, and modems, in addition to your critical network infrastructure systems.
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