What is not an acceptable substitute for connection to a secondary power source?

The use of batteries as a secondary power source in fire alarm systems is essential because they provide reliable backup power in case of a mains power failure. Batteries are designed to deliver power efficiently during emergencies, ensuring that fire alarm systems remain operational when they are most needed.

While generators, solar panels, and capacitors can be used in various power applications, they do not meet the requirements for a secondary power source in the context of fire alarm systems. Generators can provide power but require significant time to start and may not be reliable for instant backup needs. Solar panels depend on sunlight and may not function effectively during cloudy days or at night, making them unreliable in critical situations. Capacitors store energy but typically provide power for very short durations and are not suitable as a long-term backup power source for sustaining the operation of fire alarm systems.

Batteries, conversely, are purpose-built to provide the necessary power for fire alarm systems during outages, making them the only acceptable substitute for connection to a secondary power source in this context.