Load Banks

Fortress Resistors manufacture load banks ranging from small portable loads for testing petrol generators to multi-megawatt high voltage loads for large diesel generators and gas turbines at up to 13.8kV.

Regular load testing, along with correct battery maintenance, is the best way of ensuring the reliability of standby power systems.

Such tests are usually carried out against a temporary load bank brought to site for the purpose and removed afterwards, or a fixed dummy load installed with the generator.

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Fortress Resistors portable load banks module
Fortress Resistors portable load banks

Portable Load Banks

Fortress’s range of standard portable load banks is designed for testing AC and DC systems, including batteries, uninterruptible power supplies (UPS) and standby generators.

They are available for quick delivery, easily handled by one person, light, robust, simple to use, and reliable.

All units are fan-cooled, which helps to ensure a compact design. The fan supply is taken from the test load itself or from an auxiliary supply of 110 or 230V AC, according to model.

Units are fitted with over temperature protection. To reduce weight enclosures are manufactured from aluminum and fitted with handles and where required, have castors to ease maneuverability.

All units can be operated at voltages lower than their nominal rating; power is reduced accordingly.

Fortress Resistors portable load banks are light, robust and easily handled by one person

High Voltage

Fortress’s line of stationary, indoor or outdoor high voltage resistive load banks are designed and built to be permanently mounted and used for dedicated, on-site testing.

Load banks up to 13.8kV/60Hz and 11kV/50Hz can be supplied either fan forced or naturally ventilated. Using an 11kV load bank directly connected to an 11kV generator or turbine means that a transformer is not required as part of the load bank package and is often a cost-efficient method. Ratings up to 20MW are available.

Fortress Resistors stationary load banks are built to be permanently used for dedicated, on-site testing


The lightest 100kW load bank on the market. Offering a continuous load at 415 volts in a compact, lightweight, indoor enclosure.

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A stackable 20kW load bank with a low temperature gradient designed for use in data centres.

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A 100kW load bank with a low temperature gradient designed for use in data centres.

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The Fortress Difference

Fortress Resistors has a history of successfully managing large projects and provides value to customers by ensuring we understand the customer's requirements and expectations. We place an equal importance on technical capability, manufacturing to deadlines, and providing documentation and drawings in a concise and timely manner.

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    Fortress Resistors offer a wide range of products and services and are happy to provide advice to assist you to make the right decisions for your application. If you need help adapting a product to suit your needs, advice on complying with applicable standards, or if you can’t find the information you’re looking for, send us an enquiry or give us a call. One of our team will get back to you promptly.

    Manufacturing resistors for Australia and New Zealand