Prove the performance, don't assume it
A generator set that has never run at full load has never been tested. Load banks apply a precise, controllable, repeatable electrical load so that the real performance of a generator — voltage regulation, frequency stability, temperature rise and fuel consumption — can be measured rather than assumed.
Cunmi supplies resistive and capacitive load banks for factory testing, site commissioning and periodic verification of standby plant, with particular focus on data centres and factories. Every load bank is available with automatic stepping, programmable load profiles and data logging for test reports.
Load bank product family
| Product Type | Capacity | Power Factor Range | Typical Application |
|---|---|---|---|
| Resistive | To 1,000 kW per unit | Unity | Commissioning and periodic testing |
| Capacitive | Configured per project | Leading | Power-factor and data-centre testing |
| Combined resistive / capacitive | Configured per project | 0.8 lagging to unity | Full load-bank commissioning |
| Containerised | Multi-unit packages | Unity | Data centres, factories, rental fleets |
| Trailer-mounted | To 1,000 kW | Unity | Mobile service and rental fleets |
General technical specification
Exact ratings are configured per project. The table lists the standard parameter envelope of the Cunmi load bank range.
| Capacity | To 1,000 kW per unit, paralleled for higher ratings |
|---|---|
| Voltage | 400 V – 11 kV, 50 Hz / 60 Hz |
| Load steps | 1 kW minimum resolution |
| Control | Manual, automatic ramp, programmable profile |
| Cooling | Forced air, horizontal discharge |
| Protection | Over-temperature, air-flow, phase imbalance |
| Enclosure | IP23 indoor / IP54 containerised |
| Instrumentation | Power analyser with harmonic measurement |
| Data logging | USB, Ethernet, Modbus TCP |
| Compliance | IEC 60947, ISO 8528 verification |
Where load banks are used
Factory acceptance testing
Verifies steady-state and transient performance of a generator set at rated load before it leaves the works.
Data-centre commissioning
Steps resistive and capacitive load through the commissioning sequence to prove cooling, protection and load acceptance.
Hospital emergency testing
Periodic full-load runs that keep standby plant verified between scheduled blackout tests.
Marine generator commissioning
Harbour and sea-trial loading for auxiliary and harbour generator sets.
UPS system verification
Capacitive steps validate leading power-factor capability without putting the real load at risk.
Rental fleet testing
Fast incoming and outgoing inspection of rental sets before every hire.
Load bank in operation
Need a load bank for commissioning?
Tell us the generator rating, voltage and the tests you need to perform. We will specify the load bank capacity, step resolution and control interface.