A Load Bank is a device which develops an electrical load, applies the load to an electrical power source and converts or dissipates the resultant power output of the source. A Load Bank is intended to accurately mimic the operational or “real” load which a power source will see in actual application. However, unlike the “real” load, which is likely to be dispersed, unpredictable and random in value, a Load Bank provides a contained, organized and fully controllable load. Consequently, a Load Bank can be further defined as a self-contained, unitized, systematic device which includes both load elements with control and accessory devices required for operation. Where the “real” load is served by the power source and uses the energy output of the source for some productive purpose, the Load Bank serves the power source, using its energy output to test, support or protect the power source.

Introducing Paarsun load bank

The Paarsun load bank is HMI/MAN controlled resistive-reactive loads designed for general purpose AC generator testing.
Load bank is designed to provide a determined load on the generators with very varied load step resolution.
The load bank are manufactured from corrosion-resistant.
A gland plate is designed for fast temporary power connection.
The resistive elements are cooled by naturally airflow or a direct, forced airflow provided by an axial fan (or fans).
A differential pressure switch (DPS) is used to ensure correct fan blower rotation in air forced cooling. The input and output ducts are protected by stainless steel mesh screens.
All of the electrical and controller components are housed control panel box, which are fitted with lock that provide protection up to IP54.
Load bank is fitted with a lifting frame which provides additional strength, and allows the entire load bank to be lifted and maneuvered into position by crane.
The nameplate of load bank describes load bank specification completely.
A cooling unit could be installed on control box to cooling it in harsh or protect the power source.


Load Banks are used with Engine Generators, Battery Systems, UPS Systems, Inverters, Ground Power Units, Auxiliary Power Units, Aircraft Power Generators, Wind Generators, and Hydro Generators. Load Banks can be used for several purposes, including:

  1. Manufacturing Testing

  • Generator Test Cells

Manufacturers of standby power generators commonly use load banks to test and tune newly assembled units. When the generator has been set up in a test cell within the factory, a test engineer uses the load bank to apply a discrete, selectable electrical load to the generator and measure the response stability and endurance. During this process, the test engineer calibrates and adjusts the generator performance to ensure it meets the intended product specifications and tolerances.

  • Engine Test Cells

Manufacturers of small gas engines also use load banks to test newly manufactured engines under various mechanical loads. This is accomplished by connecting the engine to the load bank via a device called a dynamometer. Again, engine performance is monitored and, if necessary, adjustments are made to ensure the product performs within intended specifications.

  1. Field Testing & Exercise

Generators installed in the field must be periodically tested and exercised to ensure that it will operate as intended when a power outage actually occurs. Service groups use load banks to apply a load that mimics the load of the facility the generator is protecting. Any problems with the generator can then be identified and rectified in a non-critical environment.

  1. Elimination of ‘Wet Stacking’

Load banks may be installed in a diesel powered generator set to apply the additional load required to ensure the engine fully consumes the fuel in the combustion process. If a diesel engine is not operated under adequate load, unconsumed fuel will collect in the engine’s exhaust stack and form an oily coating.

  1. Demonstration

Load banks are often used as tool for demonstrating to buyers and users of a new generator set that the unit meets the performance specifications outlined in the purchase contract.

  1. Battery Discharge Tester

Load Bank Types

  1. Resistive

A Resistive load bank, the most common type, proves equivalent loading of both generator and prime mover. That is, for each kilowatt (or horsepower) of load applied to the generator by the load bank, an equal amount of load is applied to the prime mover by the generator.

  1. Reactive

A reactive load includes inductive (lagging power factor) and/or capacitive (leading power factor) loads.

Controls & Instrumentation

Load banks can be controlled via local, remote or automatic control panels.

  • Local
  • Remote
  • Automatic

Wide variety of auto control available including auto on-off, auto load regulation, KW or reverse power response, computer control.

Controls can also be mechanical or digital. Digital controls require the use of a Programmable Logic Controller (PLC) to translate digital commands into mechanical switching.

Load Bank Datasheet

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