What is the difference between weekly exercising and a load bank test?
Exercising your standby generators weekly is basically an unloaded test. For natural gas or liquid propane units, exercising confirms that your generator can run but does not check your unit’s performance which can be critical for ensuring you are ready for a real power outage event. For diesel engine driven generator sets, unloaded tests or weekly exercising can cause ‘wet stacking’. Wet stacking is when unburned fuel accumulates in the engine exhaust. This is caused by under-loading a generator. When exercising a generator or running it for short duration outages while under loaded, the engine may not reach its optimum operating temperature. When this is allowed to continue for long periods of time the unburned fuel accumulates, and can become harmful to the engine’s efficiency and life span.