Line Interactive UPS vs Online UPS: How to Decide?
As we all known that the uninterruptible power supply provides short-term emergency backup power in the event of any disturbances or disruptions to the main utility power supply. There are three types: Standby UPS, Online UPS and Line interactive UPS. However, many customers still have questions about how to decide Online UPS or Line-interactive UPS. Both online UPS and line-interactive UPS offer full protection from major power problems, such as surges, spikes, sags, blackouts, and brownouts, but they differ in a few significant areas. In this blog, we will explore more about the distinguishs between this two types, including costs, protection levels, sine wave output, voltage regulation, and double-conversion inversion.
Simply, an online UPS is an online UPS offers a higher level of protection than a line interactive at a higher cost.
Sine Wave Output
In an uninterruptible power supply (UPS) system, the waveform refers to the shape and characteristics of the voltage output provided by the UPS. The waveform determines the quality of the power supply and its suitability for connected devices. Different types of UPS systems can provide different output waveforms, each suited to specific applications and equipment requirements. There are three types of wave currents: square, simulated sine, and true sine.
Square Sine Wave
This type of waveform consists of simple square pulses with rapid voltage polarity changes. An battery backup system with square sine wave is the simple design with the lowest manufacturing cost. Not suitable for most electronic devices, can cause noise and overheating, and is unsuitable for precision equipment.
Modified Sine Wave
The waveform of modified sine wave is similar to a square wave but has steps at the top and bottom to approximate a sine wave. An UPS power supply system with modified sine wave output has lower cost than the UPS with ture sine wave, suitable for most household appliances and simple electronic devices. But it cause reduced efficiency, increased noise, or heating in some devices, such as motors and transformers. SVC VX Series Line Interactive UPS come with Modified Sine Wave output.
Ture Sine Wave
The best quality wave is the true or pure sine wave. This is the ideal wave for both equipment performance and longevity. It is a continuous, smooth sine curve that closely resembles the natural waveform of utility. power. The pure sine wave UPS is ideal for providing high-quality power for all types of appliances, especially for the sensitive equipments, such as computers, medical devices, and audio equipment. All SVC Online UPS Unit, as well as line interactive UPS unit, excepct the VX Series, which simulates a true sine wave.
Voltage Regulation
A line interactive UPS has two options when it comes to dealing with power, switch to battery power or buck/bump the power level to normal with an automatic voltage regulator (AVR). The Automatic Voltage Regulation(AVR) boosts/bucks the output voltage to ensure a consistent power supply to connected devices. In Line-interactive Uninterrupted Power System(UPS), the primary role of AVR is to compensate for voltage fluctuations by increasing or decreasing the voltage, thereby maintaining a stable output voltage. This allows the UPS to correct for over-voltage or under-voltage conditions without switching to battery power. This capability is crucial for protecting devices from voltage variations and reducing the frequency of battery usage. For instance, a range can be between 100v and 120v. So here are the options for the current:
1.) If the current coming from the wall is normal then it goes right through.
2.) If the current is abnormal but still within a certain range, the voltage regulator will either boost the current up to normal or bring it down to normal.
3.) However, if the current is abnormal and outside of the range then the UPS will switch to battery power just like the standby UPS.
AVR is particularly useful in areas with unstable power supply, such as regions with poor grid quality or frequent voltage fluctuations. By using AVR, a Line-Interactive UPS can continue to provide stable power to devices even in adverse power conditions without frequently switching to battery mode.
Double conversion Inversion
Unlike other systems that rely on a battery to prevent downtime, online UPS systems use a method known as "double-conversion" to address power issues. Although it might sound complex, double conversion is quite straightforward. AC (Alternating Current) can travel long distances but lacks the consistent quality of DC (Direct Current). On the other hand, DC power is very stable and of high quality but is best suited for short distances, like those within a UPS.
In an online UPS, all incoming AC power is converted into DC power first. This conversion happens regardless of the condition of the incoming power. The DC power is then converted back into AC before it leaves the UPS. This process effectively filters and cleanses the power, ensuring that the equipment connected to the UPS receives the highest quality power possible.
In an online UPS, all incoming AC power is converted into DC power first. This conversion happens regardless of the condition of the incoming power. The DC power is then converted back into AC before it leaves the UPS. This process effectively filters and cleanses the power, ensuring that the equipment connected to the UPS receives the highest quality power possible.
How to Decide
While an online UPS provides the highest level of protection, it can be expensive. These UPS units are ideal for sensitive, mission-critical equipment that handles large amounts of power. For those seeking excellent protection without a high cost, line-interactive UPS systems offer a great solution. Line-interactive UPSs strike a balance between protection and affordability. As the manufacturer of uninterruptible power supply, SVC Power offers line interactive UPS system ranging from 550VA to 5KVA for every system, and online UPS system ranging from 1KVA to 200KVA perfect for sensitive, high-powered equipment.
Check out SVC's online UPS and line-interactive UPS to choose the right level of UPS for your needs.
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