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An uninterruptible power supply (UPS), also known as a backup battery, can provide backup power if the normal power fails or if the voltage drops to an unacceptable level. A UPS provides a safe and clean shutdown of your computer and connected equipment. The size and design of the UPS determine how long the UPS is powered on.
In an online UPS, there is no need for a power transfer switch, because the battery is always connected to the inverter. In the event of a power failure, the rectifier comes out of the circuit and stabilizes the battery power.

When the power is restored, the rectifier discharges most of the charge and starts charging the battery. However, the high-power judge can limit the charge current to prevent the battery from overheating and seeding the electrolyte. Compared to other types of UPS, the biggest advantage of an online ups manufacturer is that it can provide an "electrical firewall" between the network and sensitive electronic devices.

Online UPS are well suited for environments that require electrical insulation and for equipment that is highly sensitive to currency fluctuations. However, as technology has advanced, online UPS units are only used in large installations over 10 kilowatts. It is currently available as a consumer device and supplies less than 500W of power.

The initial cost of an online UPS system can be high, but due to the long battery life, the total cost of ownership is usually low. An online UPS is needed when the energy environment is 'noisy', the public power supply is down, or when abnormal phenomena such as a power outage occur frequently, when it is necessary to protect the charge of sensitive IT equipment, or when a standby generator needs have been exploited for a long time.

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