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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