What Is Online Ups And Offline Ups?

What Is Online Ups And Offline Ups
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What Is Online Ups And Offline Ups?

Online UPS

The Online UPS, consisting of a rectifier, battery, and inverter, is directly connected to both the AC mains and the load. The rectifier circuit converts the AC power into DC power, which is used to charge the battery and supply the inverter circuit that powers the load. The transfer switch is always in the ON position, allowing power to be continuously delivered to the load from the rectifier and inverter circuits, without any interruptions in case of a power outage.

Benefits of Online UPS

  • One of the significant advantages of using Online UPS is that there is no need to switch between the two power paths during a power outage, thus ensuring that power is continuously delivered to the load.
  • Another benefit is that Online UPS provides proper isolation between the load and input circuits, resulting in distortion-less signals.
  • Since the inverter is always in the ON position, power is continuously available to the load, resulting in zero transfer time.

 

Drawbacks of Online UPS

  • Designing an Online UPS is complex, as it requires a large heat sink.
  • The instantaneous supply of power to the battery backup and inverter circuit in Online UPS leads to increased power dissipation.
  • The cost of designing Online UPS is higher than that of Offline UPS.

 

Offline UPS

The Offline UPS functions by directly providing the AC power to the device connected to the load. During normal operation, the AC power is supplied directly to the load, while the battery is charged with the help of the rectifier circuit.

However, in the event of a power outage, the Offline UPS switches the position of the transfer switch to connect the load to the battery backup path. The charged battery then supplies DC power to the inverter, which converts it into AC and supplies it to the load terminal.

 

Benefits of Offline UPS

  • One significant advantage of the Offline UPS is its low design cost in comparison to the Online UPS.
  • The internal control of the Offline UPS is simple, as there are only two paths, which work at different times according to the position of the transfer switch.
  • The efficiency of the Offline UPS is high because the battery backup and inverter are not always ON, as they are in the case of the Online UPS.

 

Also read :- Difference between off grid and on grid solar system 

Drawbacks of Offline UPS

  • The electric signal obtained from the Offline UPS has poor quality because the inverter is not always ON.
  • In case of power outage, the transfer time is approximately 5ms, during which there will be no output power. There will be a slight disruption in the output power due to transfer time.
  • Since the Offline UPS directly supplies AC power when it is available, any spikes or surges present in the input voltage will also be transmitted to the output circuit.

 

FAQ –

What is the difference between offline and online UPS?

The main difference between online and offline UPS lies in their working principles. An online UPS continuously supplies power through the rectifier and inverter circuit, while an offline UPS directly supplies power to the load circuit from the mains and switches to the backup source only when the mains power fails.

 

What is an online UPS?

An Online UPS is a type of uninterruptible power supply that utilises either a double or delta conversion technology. With double conversion, network equipment does not receive electricity directly from the AC outlet. Instead, AC power travels to a rectifier, where it becomes DC power.

 

What is an offline UPS?

In an off-line ("standby") UPS system, the load is powered directly by the input power, and the backup power circuitry will only be invoked when the utility power fails. Specifically speaking, the load is fed directly from the raw mains power rather than the inverter output

 

What is the difference between UPS offline and line interactive?

Beyond battery backup, line-interactive UPS provides far better control over power fluctuations then offline systems. The critical advantage of line-interactive UPS is the voltage boost circuitry and the range of input voltage that that UPS accepts. The wider the range, the more total protection you will have.

 

How long do online UPS last?

7 to 15 years

On average, a well-maintained online UPS can last anywhere from 7 to 15 years. Higher-quality components generally contribute to a longer lifespan. UPS units with premium components may be more expensive upfront but can offer better durability and reliability over time.

 

Which UPS is best for home online or offline?

Online UPS vs Offline UPS Comparison

Feature

Online UPS

Offline UPS

Efficiency

High (around 85-90%)

Slightly lower

Protection Level

Complete protection from all power disturbances

Basic protection

Cost

Generally more expensive

More affordable

Best Use Case

Critical operations, servers

Home, small office setups

 

What are the three types of UPS?

In this blog, we'll explore the different types of uninterruptible power supply systems, how they differ in operations, and the levels of protection they provide your critical load. The three most common types of UPS systems are standby (offline), line-interactive, and online double conversion.

 

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