Which of the following can be a source of energy for a UPS system?

Batteries are a primary source of energy for Uninterruptible Power Supply (UPS) systems, which are designed to provide backup power when the main power source fails. They store electrical energy and release it when necessary, ensuring that connected devices continue to operate without interruption.

UPS systems rely on batteries because they can respond almost instantaneously to power outages, providing a seamless transition to backup power. The technology behind batteries, including lead-acid or lithium-ion types, is specifically designed to support the needs of UPS applications in terms of reliability, safety, and efficiency over short periods.

While diesel generators, solar panels, and wind turbines can serve as power sources in broader energy systems, they do not function in the same immediate capacity as batteries within a UPS context. Diesel generators require time to start up, and while renewable sources like solar panels and wind turbines provide green energy, they are not typically used for instant backup power due to their variable output and dependence on environmental conditions. Thus, batteries are clearly the most suitable energy source for UPS systems.