Firstly it is important that you know how the sizes of UPS devices are classed. It is standard for UPS devices to have a VA rating. The VA rating is the amount of Volts * Amps the device can deliver - it should be noted at this stage the VA rating is different from the Watts (power drain) used.
One of the most common questions in the purchase of a UPS device is what VA rating is suitable for the equipment that you have. It is important that you get VA rather than wattage ratings. There are a few methods that you can use to estimate your VA usage and therefore get a UPS device that is suitable for your equipment.
The most effective method is direct measurement. There is equipment available to measure the draw of your equipment. Measurement equipment is available in both high end and budget ranges. It is advised that you use a quality ammeter to measure the draw of your equipment.
For a lot of people they may have a similar set up in terms of equipment as other people - they can then ask their advice on the VA rating of the UPS device they are using. Comparing your set up to somebody else can give you a good estimate of the WA rating required. You should also ask the vendors for their advice as they are the experts. For simple set ups they will be able to advise however if your set up is complicated this may not be the best method.
Another method is to look at the equipment rating. The equipment rating is usually found on the back panel near when the power cord enters the equipment. It should be noted that the equipment rating figures will be quite conservative as the manufacturers give a bit of leeway.
Finally remember your may increase the complexity of your set up in the future therefore you should purchase a UPS device that can easily handle your current equipment and any future equipment that you may add to your set up.
Darrell F writing about uninterruptible power supplies (UPS) devices and how to choose the correct system to ensure power protection for your equipment.
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