A load bank is a portable artificial resistive or reactive load that can be connected to your generator or UPS (uninterruptible power supply).
It allows you to perform testing on your power supply equipment at specific load values to test your equipment’s capabilities of handling load.
Generators are tested to their full rated capacity for a defined period of time to validate correct and safe operation of the engine, alternator, auxiliary systems and controls.
This is important for a business as you need to feel confident that in the case of power-loss, your equipment will not fail to accept the load of your site as a whole.