Load Bank Testing · Gauteng
Load Bank Testing.
Know Before You Need It.
Standby generators that rarely run under full load develop faults that only emerge during a real power event. Load bank testing verifies your generator can deliver its rated output — before that moment arrives.
Testing Stages
Stepped Load Testing to Full Capacity
Half-load test
Initial warm-up stage. Voltage, frequency and temperature rise monitored as the generator stabilises under load.
Three-quarter load
Load increased to 75% of rated capacity. Fuel consumption, cooling performance and output stability checked.
Full rated capacity
Generator tested at its full rated kVA output. Any capacity shortfalls, voltage droop or thermal issues are identified here.
The Service
Why Load Bank Testing Matters
Standby generators often run only during testing or actual power outages, rarely experiencing their full rated load. Over time, light-duty operation leads to problems that only emerge under heavy load — precisely when you need the generator most. Load bank testing reveals these hidden issues before they cause failures during actual emergencies.
A load bank places a controlled electrical load on the generator, allowing us to test performance at 50%, 75%, and 100% of rated capacity. During testing, we monitor voltage stability, frequency regulation, temperature rise, fuel consumption, and overall operating behaviour. This data confirms whether your generator can actually deliver the power it is rated for.
Load bank testing also addresses a common diesel generator problem called wet stacking — unburned fuel and carbon deposits that accumulate in the exhaust system when engines run under light loads for extended periods. Running the generator under full load burns off these deposits, restoring proper combustion and preventing long-term engine damage.
We recommend load bank testing annually for critical standby generators, or after any major repair. The test provides documented proof of generator capacity, which is important for insurance compliance, asset management, and your own confidence that backup power will perform when needed.
What We Monitor
Output voltage stability
Voltage is measured under increasing load to confirm it stays within acceptable limits at all stages.
Frequency regulation
Engine speed and governor response are verified to maintain correct Hz output under varying load.
Thermal performance
Coolant temperature, oil temperature, and exhaust temperature are monitored throughout the test.
Wet stacking clearance
Full-load operation burns off unburned fuel deposits in the exhaust system of diesel generators.
Fuel consumption rate
Actual fuel burn at rated load is measured and compared against manufacturer specifications.
Compliance documentation
A full test report is issued on completion, suitable for insurers, asset managers, and compliance records.
Service coverage: Load bank testing is available across all Gauteng areas including Johannesburg, Pretoria, Sandton, Midrand, Centurion, Randburg, Roodepoort, Kempton Park, Boksburg, Benoni, Germiston, Alberton, Fourways, and surrounding regions. View all service areas →
Need Load Bank Testing?
Schedule a load bank test across Gauteng and get documented proof your generator can deliver when it matters most.