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Frequently Asked Questions

What is a Load Bank?

A load bank is a device that creates a sustainable electrical load safely. The load is applied to a power source to validate system design performance and capacity under any operating condition.

What Type of Load Banks are Available from ComRent?

  • Resistive Load Banks to simulate the operational load that a power source will see in actual use
  • Reactive Load Banks to accurately simulate a leading or lagging power factor created by electromagnetic systems on a power network. Motor driven devices, transformers, and capacitors all create a reactive load on a power system. Many times, a comprehensive system test or commissioning will include a reactive load bank to simulate a reactive load on relays, circuit breakers, and other key components to properly test the power system. Reactive load banks a categorized in 2 general varieties:
    • Inductive Load Banks– provides a lagging power factor commonly seen in motors, heating, and transformers. Inductive load is used to test performance of generators, voltage regulators, conductors, switchgear and other equipment.
    • Capacitive Load Banks– provide a leading power factor to compensate for power factor correction commonly seen in telecommunications, computers, and UPS systems.
  • Direct Current (DC) Load Banks are used to test the voltage and current of batteries and other DC systems.

What are the Differences Between Load Bank Testing and Plant Load Testing?

The most critical differences between load bank testing and plant load testing are scheduling flexibility, load sustainability and testing duration.

Load banks do not rely on plant availability; therefore, are able to offer power-on-demand when you need to test. A load bank’s primary function is to deliver a sustainable power load to enable full capacity system testing for short and prolonged periods of time.

Load Bank
Constant / Sustainable Load
Quick Data Collection
Short Lead-Time Planning
Short Execution / Less Man Hours
Plant Load
Inadequate / Fluctuating Load
Prolonged Data Collection
Long Lead-Time Planning
Longer Execution / Man Hours

Why test with load banks?

The simple answer: Load banks provide a faster, better, safer, and an ultimately cheaper solution.

<p”>They also:

  • Let you test real-world situations.
    Testing with load banks provides you with constant, sustainable and controllable load. The constant load of a load bank enables faster data collection for validation of design specifications, shortens lead-time to commissioning, and ultimately requires less labor for lower costs.
  • With load banks, you can minimize risk of outages during the commissioning phase.
    Real-world conditions while connected to the grid can result in real-world outages if equipment fails. And failure means you’re not producing or selling power – with a potential loss of a million dollars or more per day. Commissioning with load banks instead of the grid minimizes this risk, accelerates the process, and delivers more accurate results.
  • Load bank testing will save you time in substation commissioning.
    Your load bank partner needs the expertise, knowledge, and proprietary testing equipment necessary to commission substation components for the modern smart grid – safely, quickly, and with limited risk.
  • Load banks eliminate the need for grid load.
    With the right load bank equipment, you will no longer need to use grid load to test transformers, switches, substations, or any equipment that is critical to power generation. And that means greatly reducing the risk of outages caused by failed load tests.

Why is Load Testing Important?

Load bank testing will save you time and money in the long run. It is how you determine the operating status of your primary power systems. It’s also how you exercise backup systems to ensure they will be available when called upon. Load testing at start-up and during commissioning and maintenance will detect problematic conditions before they escalate and cause downtime.

What Problems Can Load banks Detect?

Load banks detect a wide range of conditions that could threaten a power system. Defective equipment, design errors, flawed construction, emissions, natural aging, improper settings on system control components and the negative effects of under utilization are among the problems load bank testing can detect before they cause a power disruption.

Why Should I Rent a ComRent Load Bank When I Can Purchase My Own?

Renting a load bank frees you from the maintenance and warehousing costs of owning the equipment. Technical and compliance consultants are another expense saved by renting from ComRent. It also saves time. We’ll manage the equipment, logistics and technical support details that are part of every testing project, freeing you to focus on other areas.

Where Can I Rent a Load Bank from ComRent International?

You may rent from any of ComRent’s 18 regional offices. Visit our Contact page to find the office nearest you.

Does ComRent Offer National Service Contracts?

Yes. ComRent established a National Accounts service for customers who are managing multiple projects throughout the U.S. and internationally. The service simplifies procurement through end-to-end coordination of rental equipment, logistics and technical support. Cost consolidation opportunities are also available to National Accounts customers.

Shawn Wattles Strategic Account Manager

What if I need to test outside of North America?

ComRent provides load bank testing services internationally. South America, Europe, Asia and India are among the global locations where we’ve provided our services.

For more information, contact us at 888-881-7118 or email a member of our International Projects Team.

Edward Huffman

What if I Have Questions Before, During or After my Test?

A ComRent representative is always available to answer questions. We offer 24/7 technical and logistical support for all projects.

Who Should I Contact?

Contact our headquarters at 888-881-7118 or submit a Request for Information form.





Contact a Load Bank Expert

Do you have a question? Connect with one of our experts. Please fill out the form and a member of our team will contact you within one business day.

Call an expert at ComRent today!   888.881.7118