Portable Resistive Load Banks - Portable resistive load banks offer field-friendly testing for mobile generators and temporary power assets.

Portable Resistive Load Banks constitute one of the most widely adopted forms of load testing equipment in the US. Characterized by their ease of mobility, relatively simple operation, and versatile application, these units are typically housed in compact enclosures or trailer-mounted for easy transport between job sites.

Their core function is to provide a purely resistive (unity power factor) load, which is sufficient for testing the real power (kW) capacity of a generator's prime mover and alternator. Portable resistive units are the staple for routine maintenance and wet-stacking prevention for diesel generators across various industries, including construction, rental fleets, commercial facilities, and small to mid-sized industrial operations. 

Their utility stems from the convenience they offer, allowing service technicians to perform vital testing and maintenance quickly and effectively on a distributed base of emergency power equipment, thereby maximizing uptime and compliance across diverse client portfolios. The flexibility of the rental market heavily relies on the availability and efficiency of these highly mobile units.

FAQs on Portable Resistive Load Banks
What is the primary advantage of using a portable resistive load bank over a stationary unit?

The key advantage is versatility and cost-efficiency for maintenance service providers and rental companies. Portability allows a single unit to be used for testing multiple power sources across different physical locations, reducing capital investment for end-users who only require testing periodically.

Why are resistive load banks the preferred choice for preventing "wet stacking" in diesel generators?

"Wet stacking" occurs when a diesel generator runs for extended periods at very low load, leading to unburned fuel buildup. A resistive load bank can safely and incrementally apply a sufficient high load (kW) to the generator, allowing the engine to reach its optimal operating temperature and pressure, thereby burning off the excess fuel and preventing the issue.

In what applications might a portable resistive load bank alone be insufficient for comprehensive testing?

A resistive-only unit is insufficient when the system being tested supplies loads with a lagging power factor, such as large electric motors or transformers. In these cases, a reactive (or combined resistive/reactive) component is needed to accurately simulate the full real-world kVA load and test the system's ability to handle reactive power.