Power interruptions at substations, control facilities, data centres and industrial sites can affect equipment that needs a continuous and stable electrical supply. A UPS provides an important layer of backup, but dependable performance begins with selecting the correct capacity and configuration.

A 5kVA requirement and a 40kVA requirement involve more than a difference in load size. We also need to consider phase configuration, actual kW demand, battery autonomy, future expansion, environmental conditions and redundancy requirements.

For projects looking for an industrial UPS system supplier, we support critical power requirements with solutions including the RT Series and HPH Gen2 Series. Together, these ranges provide options from 5kVA through 40kVA for different electrical architectures.

At Middle East Energy 2026, we will showcase these critical power solutions at Dubai World Trade Centre from 1–3 September 2026. Visitors can meet our team at Hall H5, Stand D10.

Why We Start UPS Sizing With the Critical Load

The first step in UPS selection is identifying which loads genuinely require uninterrupted power.

Depending on the site, these can include control and monitoring equipment, communication systems, automation hardware, servers, networking equipment and other essential electrical loads.

We recommend developing a clear load schedule before selecting the UPS.

The schedule should establish both kVA and kW requirements, where equipment information allows. It should also identify expected future loads so that the selected system is not immediately constrained when equipment is added.

This is particularly relevant when planning a substation UPS system in the UAE, where a critical-power installation may need to support future control, communication or monitoring upgrades.

UPS capacity should therefore reflect the electrical design and planned operating conditions rather than simply matching today's connected load.

5kVA to 10kVA: RT Series for Single-Phase Critical Loads

For smaller critical-power requirements, the RT Series includes 5kVA, 6kVA, 8kVA and 10kVA single-phase models.

These units use online double-conversion topology and have an output power factor of 1. The corresponding power ratings are therefore 5kVA/5kW, 6kVA/6kW, 8kVA/8kW and 10kVA/10kW.

Online double conversion continuously processes incoming power before supplying the connected equipment. This makes the architecture suitable for applications where sensitive loads require a controlled power supply.

The RT range also allows up to four units to be configured in parallel.

When we review requirements within this capacity band, however, we look beyond the headline rating. Input and output voltage, load characteristics, battery requirement, installation space and environmental conditions all need to correspond with the site.

Runtime Can Change the 5–10kVA Configuration Significantly

A UPS rating tells us how much load the system can support. It does not tell us how long the load will remain supported during a power interruption.

That distinction is critical.

For example, published RT Series runtime data show that a 5kVA standard model operating at 230V provides approximately 5.1 minutes at 100% load using its inbuilt battery. At 50% load, the published runtime increases to approximately 15.2 minutes. External battery packs can extend these periods substantially.

This demonstrates why we should establish the required autonomy before finalising a UPS configuration.

One facility may need backup only until a standby generator becomes available. Another may need considerably longer autonomy to support a controlled process or shutdown.

The RT Series supports VRLA and lithium-ion battery options, providing additional flexibility when battery technology forms part of the project requirements.

When Does a Project Need to Move Towards a Larger Three-Phase UPS?

As critical loads increase, three-phase power becomes increasingly relevant.

At the upper end of this selection range, the HPH Gen2 Series provides 20kVA/20kW, 30kVA/30kW and 40kVA/40kW three-phase configurations. Its nominal input and output options include 380V, 400V and 415V three-phase arrangements.

This makes the range relevant for larger critical-power environments where a three-phase electrical architecture is required.

We do not recommend moving to a larger UPS simply because a higher rating appears to provide more security. Oversizing can affect capital expenditure, operating efficiency, battery configuration and space requirements.

Instead, we look at the actual load profile and the level of spare capacity justified by the project's expansion plan.

20kVA to 40kVA: What HPH Gen2 Adds to the Selection Process

Larger critical loads place greater emphasis on efficiency, manageability and installation footprint.

The HPH Gen2 Series provides online-mode efficiency of up to 96%, while Eco Mode can reach up to 99%. The range also provides an input power factor of at least 0.99 at full load.

Its three-phase models support parallel configuration of up to four units, which can be relevant where a project requires capacity expansion or a suitable redundancy arrangement.

For teams searching for a 40kVA UPS supplier in the Middle East, these characteristics should be evaluated alongside battery autonomy and the criticality of the connected equipment.

The HPH Gen2 also incorporates a 5-inch touchscreen for local system management, with communication options available for remote monitoring.

For critical facilities, monitoring capability can become an important part of operations because the UPS needs to be managed as an active infrastructure asset rather than equipment that is considered only during a power failure.

Efficiency Has a Long-Term Impact

UPS efficiency becomes increasingly significant when equipment operates continuously.

Every electrical loss generates additional energy consumption and heat. That heat may then need to be removed by the facility's cooling system.

Across a large critical-power installation, these losses can influence operating costs over the life of the equipment.

The RT 5–10kVA range reaches online-mode efficiency of up to 95.5%, with Eco Mode up to 99%. The HPH Gen2 range provides online efficiency above 96%, with Eco Mode also reaching 99%.

We therefore recommend evaluating efficiency at the expected operating conditions rather than comparing UPS systems solely on initial purchase cost.

This is particularly relevant for critical power backup across GCC facilities, where continuous operation and cooling requirements can contribute considerably to lifecycle costs.

GCC Conditions Make Temperature Assessment Important

Environmental specifications should be reviewed carefully for installations in the UAE and wider GCC.

The RT 5–10kVA models have a specified operating range of 0°C to 55°C, with load derating between 45°C and 55°C.

The current EMEA HPH Gen2 technical data specify operation up to 50°C, with derating from 40°C to 50°C. An optional IP42 kit is also available for applications requiring additional environmental protection compared with the standard IP20 configuration.

These ratings do not remove the need for suitable room design and thermal management.

When we review a UPS requirement, we recommend checking expected room temperature, ventilation or cooling, dust exposure, available clearances and the manufacturer's installation requirements.

A Practical Selection Path From 5kVA to 40kVA

Rather than selecting from a capacity list alone, we use a sequence of engineering questions.

What equipment needs uninterrupted power?

This establishes the critical load.

What are the actual kVA and kW requirements?

Both should be checked against the UPS rating.

Is the required architecture single-phase or three-phase?

The answer should come from the site's electrical distribution design.

How long must the UPS support the load?

This determines the battery-autonomy requirement.

Will the critical load expand?

Planned growth can influence capacity and parallel-system decisions.

Does the project require redundancy?

Where continuity requirements justify it, the system architecture needs to account for the appropriate redundancy strategy.

What are the site conditions?

Temperature, altitude, installation space and environmental protection can all influence the final configuration.

Working through these questions gives us a much stronger basis for recommending a UPS than selecting a unit solely from its kVA rating.

Discuss Critical Power Requirements With Us at Middle East Energy 2026

Substations, industrial facilities, data centres and other critical sites all have different backup-power priorities. The appropriate UPS configuration should reflect those operational requirements.

At Middle East Energy 2026, we will showcase our critical-power solutions and discuss UPS selection with consultants, contractors, utility teams, facility operators and project decision-makers.

Visit us at Hall H5, Stand D10, Dubai World Trade Centre, from 1–3 September 2026.

Whether a project requires a compact 5kVA system or a three-phase solution approaching 40kVA, we begin with the load, required runtime, electrical architecture and operating environment. By assessing these factors together, we can help project teams identify a UPS configuration suited to the continuity requirements of their facility.