difference between z

Difference between Online UPS and Offline UPS

Difference between Online UPS and Offline UPS

Did you know that there is a big difference between online UPS and offline UPS? Many people don’t realize this, but it’s an important distinction to make when choosing the right UPS for your needs. Here we’ll take a look at the key differences between online and offline UPSs, so you can be sure you’re getting the right protection for your equipment.

What is Online UPS?

  • Online UPS systems are a type of UPS that provides protected power by converting AC to DC, and then back to AC again, using a rectifier and an inverter.
  • The rectifier converts the incoming AC power to DC power, which is then used to charge the batteries. The inverter then converts the DC power from the batteries back to AC power.
  • Online UPS systems are also equipped with filters that clean the power before it enters the system, and provide protection from surges and spikes. Online UPS systems are typically used in mission-critical applications where downtime is not an option.

What is Offline UPS?

  • Offline UPS, also known as standby UPS, is the most basic type of UPS. It consists of a battery connected to the mains supply, with a simple controller to switch between the two when power is lost.
  • The battery is only used when power is lost, which means that it does not need to be continuously charged. However, this also means that the battery will only last for a limited time, typically around 15 minutes.
  • Offline UPS systems are typically used for devices that can tolerate a brief power outage, such as desktop computers. They are also relatively cheap and easy to maintain.

Difference between Online UPS and Offline UPS

Online UPS systems are typically more expensive than offline UPS systems, but they offer a number of advantages in terms of power quality.

  • Online UPS systems convert AC to DC, and then back to AC using a rectifier and inverter.
  • This ensures that the output is always in phase with the input, which can help to protect sensitive equipment from power surges.
  • In addition, online UPS systems provide a higher level of protection against brownouts and blackouts.
  • Offline UPS systems, on the other hand, do not provide this level of protection.
  • Instead, they simply switch to battery power when the input voltage drops below a certain threshold.

As a result, offline UPS systems are less expensive than online UPS systems, but they offer less protection against power fluctuations.


Online UPS is a great choice for businesses that want to save money on their power bills. It’s also a good option for companies that have a lot of electronic equipment because it can protect your devices from power surges and outages. If you’re looking for an offline UPS, be sure to consider the amount of power you need and how long you want your backup battery to last.

Share this post

Share on facebook
Share on twitter
Share on linkedin
Share on email