How does a battery backup work?

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A battery backup system can be a valuable addition to any office or home office computer setup. Also known as an uninterruptible power supply, these devices allow you to save any open work in the event of a power failure.

Installation

A battery backup is essentially a storage battery combined with a power strip. The backup system plugs in to the wall, and you plug your PC and monitor into the backup.

Normal Operation

Under normal conditions, the backup performs just like a power strip, providing powered sockets for your PC hardware. While connected, however, it charges the storage battery via a trickle charger.

Outage

Should the backup detect a power outage, it then switches over to battery power, providing enough charge to run a PC and monitor for a short time. This should give you enough time to save any important files and shut down your PC normally.

Power

Backup systems are rated by the wattage they provide. Three hundred to 400 watts are sufficient for most computer systems and most modern backups will provide at least 15 minutes of power. Larger batteries allow for more run time.

Power Conditioning

Some backups also "condition" the incoming electricity, nullifying both spikes and dips in the voltage that can damage equipment.

Source:

American Power Conversion Corp: The Different Types of UPS Systems

TDLP.org: UPS Basics

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How does a battery backup work?

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