power outage

Two main types: battery-backup UPS units, which provide temporary power so devices can keep running or be shut down safely, and surge protectors, which only divert voltage spikes.

Joule ratings in the results range from about 250 joules up to about 890 joules.

AVR corrects brownouts and overvoltages back to usable levels without switching to battery, helping maintain safe voltage and conserve battery life.

Many units include LCD or color multifunction displays that show battery and power conditions; others use indicator lights for basic operation status.

Surge protectors focus on diverting excess voltage during spikes, while battery backup units supply temporary power so equipment can keep running or be shut down safely. Some UPS units combine both functions and may offer separate outlets that are battery-backed versus surge-only.