How to Choose the Right UPS

A UPS, or uninterruptible power supply, is a device which provides emergency power to IT equipment when the primary power source is interrupted or fails.

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A UPS is a limited duration power source which enables you to:

• Ride through a short power outage
• Provide time for a generator to kick in
• Allow for orderly shutdown of IT equipment

Additionally, many UPS systems offer complete power conditioning to protect the connected equipment from power anomalies.

UPS types (or topologies) include standby, line-interactive and on-line. They are explained in more detail above in Top 3 UPS Features and compared below in the UPS Comparison Chart.

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If you are selecting a UPS for a home or office application, you will likely choose between standby and line-interactive UPS systems. Standby UPS systems typically cost less and have some of the smallest space requirements. Even if cost is your primary concern, however, always consider a line-interactive UPS. The price difference is negligible in many cases. If you want to protect valuable and sensitive computers and electronics, especially in locations with unstable utility power or frequent storms, choose a line-interactive UPS whenever possible.

If you are selecting a UPS for a network application outside your home, such as protecting servers and network hardware for a business, you will likely choose between line-interactive and on-line UPS systems. Generally speaking, line-interactive UPS systems have lower acquisition costs and on-line UPS systems provide significantly more protection. The question comes down to whether the extra protection is worth it to you, and that usually depends on your application and tolerance for disruption and downtime. How much does it cost to replace damaged equipment? How much does it cost in revenue and aggravation if your network is down for a while?

For most types of equipment, line-interactive UPS systems provide excellent, cost-effective protection. For critical equipment essential to productivity, devices sensitive to power quality and locations with difficult power conditions, on-line UPS systems are a better choice. They provide complete isolation from most power problems, the strongest protection against costly downtime and the best compatibility with sensitive equipment.

Key Point: If budgetary considerations require you to use a line-interactive UPS where you would prefer an on-line UPS, make sure it provides pure sine wave output in battery mode instead of pulse width modulated (PWM) sine wave output.

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