An uninterruptible power system is an elegant solution to power outage concerns. The output of the UPS inverter can be a sine wave or pseudo sine wave.

When shopping for a UPS system, consider the following:

• Power reserve capacity for future growth of the facility.

• Inverter current surge capability (if the system will be driving inductive loads, such as motors).

• Output voltage and frequency stability over time and with varying loads.

• Required battery supply voltage and current. Battery costs vary greatly, depending upon the type of units needed.

• Type of UPS system (forward-transfer type or reverse-transfer type) required by the particular application. Some sensitive loads may not tolerate even brief interruptions of the ac power source.

• Inverter efficiency at typical load levels. Some inverters have good efficiency ratings when loaded at 90 percent of capacity, but poor efficiency when lightly loaded.

• Size and environmental requirements of the UPS system. High-power UPS equipment requires a large amount of space for the inverter/control equipment and batteries. Battery banks often require special ventilation and ambient temperature control.

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