A generator load bank test involves an examination and assessment of a genset. It verifies that all primary components of the generator set are in proper working condition under loaded conditions.
The equipment used to conduct a load bank test produces artificial loads on the generator by bringing the engine to an appropriate operating temperature and pressures. This is especially important for standby and emergency generator sets that do not run very often and/or may not be exposed to carrying heavy loads on a frequent basis. The general rule is - if your generator is not exposed to higher than 30% of its rated kW load then you should be considering a load test.