Data Centre Power Continuity

Data Centre Power Continuity will eliminate power dips, spikes, brownouts that would otherwise pose a serious risk to data centre IT equipment and servers. Additionally, multiple issues can be experienced when data centre power has blips, including loss of data, reduced production and time wasted dealing with re-boots. Power Continuity ltd, designs and planning for data centres always include provision for a power continuity resilient emergency power system.

Commonly held misapprehensions are highlighted below.

UPS Only Solution – Good enough?

Uninterruptible Power Supply (UPS) system provides battery backup for a data centre. These are designed for power outages of short duration, from a fraction of a second to several minutes in length. The battery autonomy (length of battery life to support the system) will obviously depend on the number of batteries installed. If it appears that power will not be restored before the UPS batteries are depleted, then data centre staff should have sufficient time to safely power-down the equipment to avoid data-loss.

The UPS equipment will also provide a smooth, constant power supply for the equipment, “ironing out” the dips and spikes from the incoming mains supply.


Rack mounted UPS are not up to the task of protecting Data Centres.

A single UPS system again is part of the journey, but not good enough as a standalone.

Resilience is required at every level. A UPS must be at least N+1 ; two in parallel as a start, although without generator backup, and multiple generators that is, UPS’s alone aren’t good enough for a power continuity protection system.


UPS + Generator Solution – Explained


A generator will provide standby power for much longer than a UPS, running forever as long as you never let the fuel tank become empty. Therefore, the size of the fuel tank needs to be considered carefully to ensure that the generator autonomy is sufficient. This gap between the loss of power and the generator start-up is bridged by the UPS, which will kick in immediately so that your IT equipment will not even notice the loss of power. Once the generator has started the UPS support is no longer needed to hold up the power; only to clean the power. Although one UPS combined with one Generator isn’t enough. Single units can and do fail. Resilience is required not luck.

Power Continuity engineers can design your complete UPS systems and Generators systems from scratch.

N+X  ( N+1 ) Redundancy Solution-  Power Continuity Explained

Simply put, N+1 or N+X refers to a system that has additional backup(s) available should the main backup system fail, where:

N = Number of components required to run the system without any backup

X = Number of backup components required

Hence N+1 equals UPS + UPS backed up by Generator+ Generator

For example, an N+1 generator system would usually comprise a main standby generator along with an additional backup synchronised generator of equal size, that would provide cover in the event of the main generator failing.

An N+1 UPS system would provide similar cover. Therefore, an N+1 UPS system coupled with an N+1 generator system would provide a good level of redundancy. Likewise, an N+2 system would provide an even greater level of cover.

Hence N+2 equals UPS + UPS + UPS backed up by Generator+ Generator + Generator

N+3, N+4 and so on.

For any N+X system, budget and the level of redundancy required are the main factors in determining the value of X.

In any case we would suggest each generator has its own independent bunded fuel tank and each UPS system has its own set of batteries

Before planning any power protection system , call Power Continuity.

Power Continuity are the specialists when it comes to 100% No Break Power Continuity

Call us on 0845 055 8455  We’re here to help

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