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UPS systems

Uninterruptible Power Supply - A device that provides battery backup when the electrical power fails or drops to an unacceptable voltage level. Small UPS systems provide power for a few minutes; enough to power down the Computer and laptop dealers store in an orderly manner, while larger systems have enough battery for several hours

An entry-level UPS with a rating of around 600 VA might be able to power a small office Computer and laptop dealers store for around ten minutes. Make the upgrade to a 1500 VA UPS, and you might see this figure jump up to an hour. Go too small, on the other hand, and the available time shrinks to just a few minutes or less

Inverters

A power inverter changes DC power from a battery into conventional AC power that you can use to operate all kinds of devices ... electric lights, kitchen appliances, microwaves, power tools, TVs, radios, Computer and laptop dealers stores, to name just a few..An Inverter is an electronic device capable of transforming a DC (DC) current into an alternating current (AC) at a given voltage and frequency. ... It is therefore indispensable to use it to power by DC, electrical devices that work in AC.