Selecting the right environment for your UPS system

When choosing a UPS, it’s natural to focus on its functional and performance specifications, such as availability, capacity, battery autonomy and energy efficiency. While these aspects are essential, there’s also another critical success factor; the installation environment.

To ensure long-term reliable operation it is essential to select the proper uninterruptible power supply (UPS) for use in the correct temperature and environments.

To make sure of the appropriate UPS selection, we recommend to always check its operational temperature specifications and choose one that meets or exceeds the environmental conditions at the installation site you have chosen. It is recommended that the UPS be installed in a temperature controlled environment similar to the intended application.

The UPS should not be placed near other heat sources or near open windows or areas that contain high amounts of moisture; and the environment should be free of excessive dust and corrosive fumes. In addition, the ventilation openings at the front, side or rear of the unit must not be blocked.

Ambient Temperature

All batteries have a rated capacity which is determined based on specified conditions.  The rated capacity of a battery is based on an ambient temperature of 20°C or 25°C. Operating the UPS under these conditions will maximize the life of the battery and result in optimal performance – we recommend a running temperature of 20°C to achieve expected service life.  While a UPS and the battery will continue to operate in varying temperatures, it is important to note that this will likely result in diminishing the performance and a reduced lifespan of the battery. A general rule to remember is that for every 10°C above the ambient temperature of 20°C the life of the battery will be reduced by 50 percent.  Therefore, keeping a battery at a comfortable temperature is crucial to maximizing UPS life and capabilities.

In many cases, a UPS is designed for use in the stated temperature environment, so internal components near their temperature limits could exceed their maximum temperature ratings. This could result in the UPS having a reduced reliability and life span, or an outright failure.

Designing adequate cooling for the UPS room will ensure the reliability of the equipment itself. If your air conditioning is working but inefficiently, it will not produce a sufficient volume of chilled air and will lead to the UPS overheating. This is typically noticeable during hot summer days. You will need to check that you have enough air conditioning units and that they are all serviced regularly to provide the correct amount of cooling for the designated UPS system.

On larger systems it may be worth considering a separate battery room to allow the battery to be kept at the optimal temperature while allowing the UPS room to have wider temperature tolerances.

Battery bank

Conditioned free cooling

Any amount of cooling you can get at no charge will conserve energy and save you money. With so much energy being consumed by UPS, heat quickly builds up and cooling it all has become an expensive necessity in order to protect systems from failure.

The first thing to know about free cooling is that it harnesses a free element – outside air.  The most direct way to use this air to cool your UPS room is to fit vents or windows that you can open on a cold day. That’s how the principle of free cooling was first born, but today’s free cooling solutions are significantly more sophisticated and energy efficient.

Letting cold air in and warm air out is a sound enough principle, but a rudimentary ventilation system is never going to bring cooling to the parts of the data centre that need it most. Letting the outside into your UPS room also presents a series of environmental and security risks that could have catastrophic consequences.  A vent could let cold air, but also dirt, insects or birds and there is a very real risk of condensation building up. This is among the reasons why water is piped into data centre environments as the heat exchange medium for free cooling systems. The feasibility for free cooling rests upon the ambient temperature being sufficiently low to deliver additional, incremental benefit to the conventional cooling operation.

It should go without saying that there are many significant dangers associated with introducing water into highly controlled environment with sensitive IT equipment powered by large quantities of electricity.  This explains the reasoning behind a professionally designed, manufactured and installed free cooling solution, delivered and maintained using industry best practices.

If you have any questions about UPS cooling or the health of your power protection unit, please call: 0800 731 3269 or email

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