An Uninterruptible Power Supply is a device connected between the power source and a load (computer, fan, TV, etc) to ensure that electrical flow is not interrupted. It is also called uninterruptible power source, UPS or battery/flywheel backup. UPS systems devices Use batteries to keep the load running for a period of time after a power failure. UPS systems cannot be confused with standby generators which do not provide protection from a momentary power interruption, or which may result in a Momentary power interruption when it is switched into service, whether manually or automatically. UPS systems usually provide protection against power surges, brownouts and line noise as well.

 

Every UPS will supply power to load (such as a computer, fan, TV, lights or medical equipment) when mains power fails. It may also regulate the power and prevent the spikes, brownouts, interference and other unwanted problems from damaging the supported equipment.

As long as you want, providing you buy enough batteries and the charging system is up to it. After about eight hours it`s usually more cost-effective to buy a generator, with a short runtime UPS to bridge the generator start-up gap.

Most plug-in UPS are good for at least seven years. We`d advise you to change the batteries every twelve months to eighteen months.

In this type of UPS, the primary power source is line power from the main utility, and the secondary power source is the battery. The battery charger is using line power to charge the battery, and the battery and inverter are waiting "on standby" until they are needed. When the line power fails, the transfer switch changes to the secondary power source. When line power is restored, the UPS switches back.