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Server UPS Buying Guide

When choosing a UPS for your servers, there are several factors to consider. This buying guide will help you choose the right UPS for your server environment. We will discuss the different types of UPS units available, as well as the key factors to consider when making your selection.


What is an Uninterruptible Power Supply (UPS)?

Server Uninterruptible Power Supplies (UPS) are essential for protecting critical server infrastructure from power outages and other disturbances. A UPS provides backup power to servers and other critical equipment, allowing them to continue operating during a power outage. This can help to prevent data loss, corruption, and downtime.

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Types of UPS units

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Buying the right UPS: Key Considerations


Capacity & Size (VA and Watts)

The UPS must have enough capacity to support the power requirements of all connected equipment. To calculate the required capacity, add up the wattage of all connected equipment. It is important to choose a UPS with a capacity that is at least 20-25% higher than the total wattage of connected equipment. This will ensure that the UPS has enough overhead to handle peak power demands.

energy ratings

Run Time

The runtime of the UPS determines how long it can power connected equipment during a power outage. The required runtime will depend on your specific needs. If you have a generator that will come online within a few minutes of a power outage, you may not need a UPS with a long runtime. However, if you need to power your servers for extended periods of time during a power outage, you will need a UPS with a longer runtime.


Output Waveform

Output waveform is the shape of the electrical signal that a UPS produces. The ideal output waveform for a UPS is a pure sine wave, which is the same type of waveform that is provided by utility power grids. However, not all UPS units produce a pure sine wave output.

Pure Sinewave: The best waveform for sensitive electronics and servers, as it is the same type of power that is delivered by your utility company.

Simulated/Modified Sinewave: A less expensive waveform that is suitable for basic applications, but not ideal for sensitive equipment, as it can cause interference and other problems.

Stand out features


Management & Connectivity

Consider a UPS that you can monitor and manage remotely, and that can be connected directly to your servers. This will give you more control over the UPS and make it easier to troubleshoot problems. Look for USB or serial interfaces for direct communication to servers.

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Some UPS units support external battery packs, which can be useful for extending runtime during power outages.


Input & Output Outlets

When choosing a UPS, consider the number of outlets you need now and, in the future, and look for features like surge protection.

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Audible Alarms and Display

Audible alarms and displays are helpful for alerting you to power outages, low battery warnings, and other issues.


Automatic Voltage Regulation (AVR)

This feature allows the UPS to correct minor power fluctuations without switching to battery power, prolonging battery life.



Ensure that the UPS is compatible with the operating systems of your servers for seamless integration.

Noise level

Environmental Factors

Consider UPS models with eco modes to save energy. Check the UPS's operating temperature range and ensure adequate ventilation to prevent overheating.

Delay Timer

Warranty & Support

Look for a model with a good warranty period and a brand that provides excellent customer support and services.

Other things to Consider


Transfer Time

Transfer time is the speed at which a UPS can switch to battery power. Ideally, it should be instantaneous or under 10 milliseconds.


Battery Replacement & Maintenance

Choose a UPS with user-replaceable batteries, if possible. This will make it easier and less expensive to replace the batteries when they need to be. Look for a UPS with battery health indicators or self-testing features. This will help you to identify and replace batteries before they fail.

UPS Brands

Auto Dosing


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