Load Bank Testing Services for Generators, Wareham MA

For diesel-powered generators, periodic load bank testing is especially important for preventing wet stacking. Wet stacking occurs when a diesel engine operates for extended periods under light loads and never reaches its proper operating temperature. Because combustion is incomplete, unburned fuel and carbon deposits accumulate throughout the engine and exhaust system, reducing efficiency and potentially causing long-term damage.

Common causes of wet stacking include:

• Extended operation at low electrical loads
• Frequent idling
• Cold weather operation
• Improper fuel delivery or injector performance
• Generators that are oversized for the connected load

Signs of wet stacking may include:

• Black residue around the exhaust system or turbocharger
• Excessive black exhaust smoke
• Reduced engine performance
• Increased fuel consumption
• Carbon buildup inside the engine and exhaust components

To promote efficient combustion, diesel generators should typically operate at 60% or greater of their rated capacity during testing or normal operation. Load bank testing safely provides the necessary electrical demand to raise engine temperatures, burn off accumulated deposits, and maintain peak performance.

Resistive load banks are the most commonly used load testing systems and simulate real electrical loads by converting electrical energy into heat through high-capacity resistors. This allows technicians to safely place the generator under a controlled load while verifying that it can produce its rated output.

During a resistive load bank test, South Shore Generator evaluates critical components, including:

• Generator voltage and amperage at rated load
• Engine cooling system performance
• Fuel system operation
• Air intake and ventilation systems
• Generator enclosure louvers and airflow
• Overall engine and alternator performance

Resistive testing is ideal for verifying generator operation under real electrical demand and ensuring the entire system performs as designed.

While resistive testing measures real power (kW), reactive load bank testing evaluates a generator's ability to produce its full apparent power (kVA) at its rated power factor. This type of testing more accurately simulates the inductive loads commonly found in commercial and industrial facilities, including motors, pumps, HVAC equipment, elevators, and transformers.

Reactive load testing provides a more comprehensive evaluation by measuring how the generator performs under conditions that closely resemble actual facility loads.

Benefits of reactive load bank testing include:

• Confirms generator performance at rated kVA
• Tests operation at the generator's designed power factor
• Simulates real-world inductive electrical loads
• Validates voltage regulation and system stability
• Ensures readiness for mission-critical applications

Unlike many generator service providers, South Shore Generator has the specialized equipment and expertise to perform both resistive and reactive load bank testing, providing customers with complete performance verification for their standby and emergency power systems.