Different types of load, from uninterruptible power supplies to VFDs and beyond, make for different approaches to your specific backup power situation.
How do I calculate the backup power requirements of my facility? Answering this question requires not only knowing what loads to backup and what their power requirements are, but also understanding how different types of loads affect the backup power source, how to manage the connection of loads, and the constraints building codes may place on this process. Although this article addresses some aspects of different types of backup power supplies, it will focus on the most common backup power supply, a standby generator set in which a liquid or gaseous fueled reciprocating engine is coupled to an AC generator (alternator).