BACK-UP POWER SYSTEMS
The most obvious benefit of a UPS system is that it is virtually silent and doesn't require the user to switch on the unit when the mains fails. The change-over from mains to UPS power is fully automatic. The added benefit is that if you are not home when the power fails, your equipment will not switch off.
An uninterruptible power supply, also uninterruptible power source, UPS or battery back-up, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries. The on-battery runtime of most uninterruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.
An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply. A standby power system may include a standby generator, batteries and other apparatus. Emergency power systems are installed to protect life and property from the consequences of loss of primary electric power supply.
They find uses in a wide variety of settings from homes to hospitals, scientific laboratories, data centers, telecommunication equipment and ships.
Battery banks are designed for the power demand required. Small battery banks are designed for a typical household to operate T.V. sets, decoders, computers and lighting. Larger banks are designed to run larger applications such as hospitals, telecommunication, refrigeration etc.
HOW LONG WILL THE INVERTER SYSTEM RUN WHEN THERE IS A POWER FAILURE
The amount of backup time is determined by the size of the connected battery bank and the load drawn from the system. The backup time is normally calculated at full load (i.e. if the system is a 3000VA system, full load is 3000VA. If you remove some of the load, then the backup time will extended relative to the power used. For example, if your system is calculated at 6 hours backup at full load and you reduce your load to 25%, you backup time can be extended up to 24 hours.
A UPS is typically used to protect hardware such as computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business single computer without a video monitor (around 200 volt-ampere rating) to large units powering entire data centers or buildings.