Modular UPS Systems Versus Stand-Alone UPS Systems

Modular UPS Systems

Increasing power requirements, improvements in component technology. And user demand over the past five years has prompted all major UPS manufacturers to develop, specify and supply modular UPS systems.

Arguments against modular UPS systems no longer make sense…

Modular UPS systems once considered “unreliable” due to a large number of components compared. To stand-alone UPS systems, the occasional failure of static output switches. And redundant power modules with a single controller, are. Now considered the elite of UPS technology and the future of the industry. They are now considered the elite of UPS technology and the future of the industry.

Its switching algorithms, which precisely control the load distribution when connecting dozens of power modules. Increase efficiency and prevent circulating currents that shorten component life. Centralized or decentralized idle switching technology has eliminated the “single point of failure” argument. In addition, the DSP controller in each module and redundant frame controllers allow hot-swapping. Or removal of power modules without affecting load operation.

Maintenance and service

During maintenance and repair work on the UPS, the connected loads are normally bridged (raw grid). To meet the requirements for safe operation. During this time, the connected devices are not protected and are vulnerable to fluctuations in the grid voltage.

Low efficiency on load

When initially selecting a UPS, especially to support a company’s growing infrastructure. Such as a data center, it is nearly impossible for the user to know the total load over the life of the UPS. Even if the load has been accurately calculated and determined, a “safety” factor is. Added to size the UPS for overloads, future server upgrades, and an output-phase based load distribution.

Like all electrical devices, UPSs are generally most efficient when operating at 100%. But in reality, this is neither possible nor practical. Stand-alone UPSs are optimized for high efficiency at medium load, but the user must choose. Between securing future power and maximum efficiency based on installed power on day one.

Enhanced modular UPS systems allow a number of modules to be put on standby. Or disconnected when the load is lower than expected or initially decreases. This not only increases redundancy but also allows for more efficient use of the remaining power modules. It is also possible to run the modules cyclically so that all modules “age” at the same rate. And all components are used for the same amount of time. If the load does not meet expectations or decrease, the user can physically remove the module if necessary. Try also: Top APC ups price in Pakistan


The power module is. Typically integrated into a UPS cage and may include, depending on the manufacturer, a manual bypass switch, the main controller, and a static switch. The size of the chassis, switchboard, and wiring determine the total power growth. But users can start with a small number of power modules and add more as the load increases. Thought should be. Given to grid protection appropriate for day one power and additional battery requirements in the future. But if that is a consideration, modular UPSs can be. Used, as they are sold on a pay-as-you-go or ramp-up basis. The user should ensure that the same modules are available from the manufacturer if needed.

Is my UPS really stand-alone?

Many “stand-alone” UPS systems, also called “monolithic” or “solid-state” depending on the manufacturer, are. Actually made up of internal components arranged in a modular fashion. Some manufacturers offer a series of physical modules with a single display and control screen and a lockable front door. While others divide the internal components into a series of small units connected in parallel.

One reason is that the production of small switching semiconductor components is by far the largest. While the number of large semiconductor components is smaller. Because of the large production size, it is always more cost-effective to use three or four times. As many components than to use larger semiconductor components. This also means that components can be. Placed more efficiently to dissipate heat, saving space and increasing the power density of devices.

In addition, it reduces production time for UPS manufacturers. As they only need to source and store a limited number of power levels. For this reason, stand-alone UPSs are sometimes designed and built to be modular internally.


Modular UPSs now dominate the marketing of major UPS manufacturers, and analysts predict. That the modular UPS market will overtake traditional stand-alone systems in the future. Deciding which technology is the most resilient, efficient, and cost-effective requires careful weighing of user and institutional requirements. If the required resiliency and efficiency are acceptable for both technologies. A stand-alone system may outperform the operating costs over the life of the UPS. With acquisition costs being the priority. Future maintenance costs, energy costs, manufacturer support, and uptime must also be considered.

Both technologies have their advantages and disadvantages, and each site’s requirements are different. A discussion with an experienced, friendly, and honest APC authorized partner in Pakistan like Multilink Engineering can help you make the right choice.

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