Modular Power Systems (MPS) Powered by Generac

What is MPS?

Generac’s MPS is an integrated approach to generator paralleling. Each MPS generator includes a paralleling switch and a fully integrated controller. The paralleling switch allows the main power leads of each generator to be connected together at a – junction box, generator distribution panel or simply the transfer switch generator lugs.

A traditional approach to paralleling three generators would typically require 14 to 20 controllers from five different manufactures. Through the use of our control technology, the PowerManager handles the operation of individual gensets by utilizing one digital control per generator to control synchronizing, load sharing, and protection.
The consolidation of these functions significantly simplifies the system while increasing system performance and providing the ability to effectively manage up to 15 units at a time. Advantages are redundancy, flexibility, and scalability in a modular type paralleling system that’s cost competitive with a large single gensets and significantly less than a traditional paralleling approach.

The concept of paralleling multiple generators in order to produce greater amounts of power is not new. In fact, it is a well-proven method commonly used with large megawatt units in premium installations. Until recently, it has not been economically feasible to combine smaller units in this fashion because of the high cost of traditional paralleling switchgear cabinets. Generac Power Solutions has broken the price barrier by combining its technical expertise, worldwide sources, and vertically integrated manufacturing methods to deliver this capability to an entirely new range of demanding applications, making this a powerful solution over a wide range of output requirements local recreation center-City of Lafayete.


In many applications, the load requiring the highest degree of reliability is only a small percentage of the total generation capacity. In these situations, the MPS solution automatically backs up the most critical load with the benefits from N+1 to N+Y redundancy. The resulting gain in reliability for the critical loads is significant.
For applications
Latysis Data Center
 in which the critical loads are considerable, the addition of one smaller generator (N+1) increases reliability for a minimal capital increase when compared to larger generator solutions. To realize the benefits of increased system reliability, it may be necessary to implement load shedding of less critical loads. The MPS system supports this functionality through three
Load shed contacts. These contacts can be integrated with supplied transfer switches, facility shunt trip distribution breakers, or integrated into the building management system.



By utilizing multiple generators instead of a large single-unit solution, much greater application flexibility
  is available. The Modular Power System can present significant advantages in meeting site-specific logistical constraints. Since the MPS generators are lighter,
roof-top installations
  have better weight distribution. The MPS generators are also shorter and lower, providing flexibility in applications with height or depth constraints. In addition, the MPS generators need not be located side by side or even together, thus providing significant installation for retrofit projects. The MPS also provides flexibility during service operations. With multiple generators available, units can be taken out of service for repair or scheduled maintenance without complete loss of site standby power. Remaining in-service units can still serve critical site loads, utilizing the priority loading feature included with the MPS system controller. Units can be identified as out of service in the controlling software, and the system adjusts priority loading sequences automatically. Further details of this feature are provided later in this paper.


Many times when sizing generators, it is difficult to adequately plan for anticipated load growth. If growth projections are too aggressive, precious project capital may be expended before it is necessary. If growth projections are too low, the facility may be left without reliable standby power or require expensive generator upgrades. The MPS system is designed with expandability in mind, allowing multiple generators to be added as needed.
For a growing facility, this expandability has two advantages. First, it reduces the initial cost by allowing purchase of a more modest system that are scaled to initial needs, one that can be expanded as necessary. Second, it eliminates the need to estimate ultimate requirements and purchase a large and expensive single-engine unit suited to that projected need – which may or may not develop as anticipated. With the Modular Power System, dynamic power requirements can be more precisely matched to reflect:

  • Lower initial investment
  • Budget / capital constraints
  • Controlled growth
  • Unanticipated growth


MPS modules are designed to simply “plug and play” with existing MPS units of any size. Additional kilowatts can be added at any time. This expandable system can be scaled to more precisely match load requirements as facilities grow or change. Units of different kilowatt ratings can be combined to meet a particular load profile.