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When deciding what type of UPS to purchase, you should determine how much an unexpected power failure would impact your business.

On-line units offer the most protection, since they run constantly. The additional cost of these systems is often deemed worthwhile for key equipment where a shutdown is unacceptable. They are usually recommended for mission critical applications such as phone systems or a computer server.

Standby and line-interactive UPS are more appropriate when an unexpected power outage, and the resulting loss of data or other information, would be more of an inconvenience than a major problem. These systems should be able to keep equipment going during most power fluctuations, but there may be the occasional situation where they do not quite work as expected. They can be a more cost-effective solution for equipment such as standalone computers or a fax machine.

Line-interactive UPS are best suited for situations where power fluctuations are common occurrences. Power fluctuations occur when "power-hungry" equipment such as an air conditioner is frequently turned on and off, causing brownouts and surges. With line-interactive UPS, these fluctuations can be handled by the transformer instead of the internal battery.