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Uninterruptible Power Supply (UPS)

Do you need a UPS? YES!

A UPS is basically an additional insurance policy for your electronic equipment and vital for maximum life of your hardware. It will not only stop most power spikes and surges from getting to your hardware. A UPS can also provide a battery powered backup in the event of a power brown-out or blackout for a period of time as well as voltage correction if the power supply voltage is too high or too low.

While most businesses already have a UPS protecting their critical equipment, few households do. Small but capable UPS’s are now cheap enough that there is basically no reason to not get one. An entry level UPS is now under $100AUD but I would recommend spending around $150-250AUD for a home PC system to give a bit more battery run time.

The big names in UPS’s are APC (Americal Power Conversion) and Eaton. Eaton consumer grade UPS’s are branded as “Powerware”. There are some other good brands such as Nikko but there are also some cheap and nasty ones that should be avoided.

Things to look for when deciding what to buy:

  • Easy battery replacment – Batteries are a consumable item and last 3-5 years, most UPS’s use readily available gel lead acid batteries
  • Compatible sockets – APC tend to use the universal IEC C13 connector which need a IEC cable to connect to a device or a converted to connect to a powerboard, Powerware use Australian standard sockets.
  • Connection (USB usually, network on commercial systems) to PC being protected – allows normal system shutdown when battery level gets critically low
  • Run time and load requirements – Run time at full load is only a few minutes, if you want more run time, buy a bigger unit. APC has an online run time calculator to calculate run time for a load for their range of UPS’s. Larger commercial grade UPS’s can have extra battery packs added for extra run time.
  • Online vs Line interractive – Most are line interractive (cuts over to battery if the supply fails) but some of these types do not like being run from a generator. If a generator backup is required (small petrol or diesel off the shelf unit, not purpose built), an online UPS (supply charges the internal battery and all output comes from the battery at all times) is generally better but also can be more expensive.

For extra surge protection, supply your UPS through a surge protected powerpoint or double adapter. Surge protection is cumulative, a single device may not be able to stop a big spike (>1000 Joules) but two or three (rated at 500+ Joules each) in line may be enough.

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