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Uninterruptible Power Supply (UPS) systems are generally divided into two main types: offline (or standby) and online. In terms of backup time, they can also be categorized as standard or long-runtime models.
The key difference between an online UPS and a standby UPS lies in their operation. A standby UPS only regulates the incoming power when the utility is stable, while the inverter remains inactive and waits for a power failure. Once the mains power is disrupted, the system quickly switches to inverter mode, converting battery power into AC output to maintain power to the connected devices. This transition typically takes less than 10 milliseconds.
On the other hand, an online UPS is always active. The inverter is continuously running, even when the mains power is available, ensuring that there is no interruption during a power failure. When the utility power is cut off, the system seamlessly switches to battery power without any downtime, offering zero transfer time.
This makes online UPS systems more suitable for critical applications where even a brief power interruption could cause damage or data loss. Standby UPS systems, while more cost-effective, are better suited for less sensitive environments.
Understanding the differences between these two types can help you choose the right power protection solution based on your needs.
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