Support Common questions about UPS

What's uninterruptible power supply (UPS)?

The English name of the UPS is Uninterruptible Power Supply. The English abbreviation is "UPS".(So this UPS is not an You-Pi-Su delivery!) Therefore, the uninterruptible power system is literally meaning that it can provide power immediately to maintain the normal operation of the computer when the power is interrupted.

Why do you need an uninterruptible power supply (UPS)?

Unstable power quality is enough to affect the normal operation of the computer. The uninterruptible power system not only supplies power immediately when the input power is interrupted, but also when the power input is normal. It can also regulate the poor quality power supply, filter out noise, and prevent lightning strikes to provide users with a stable and pure power supply. Therefore, having an uninterrupted power system is like preparing insurance for a computer device.

What are the types of uninterruptible power supply (UPS)?

There are three types of UPS: OFF LINE, ON LINE, and LINE INTERACTIVE.

What is an off-line UPS?

The reader can refer to the offline system block diagram, and a path (commonly called bypass) next to the normal power supply is directly supplied to the load. The battery is only powered when there is a power outage. It is converted to AC power by a converter to supply load power.


1. When the utility power is normal, the UPS outputs the load directly to the load for almost no processing of the mains, and the power supply noise and the swell attenuation capability are poor.

2. With conversion time, the protection is the lowest.

3. The structure is simple, small in size, light in weight, easy to control, and low in cost.

What is an On-Line UPS?

On-line UPS is usually output to the load power by the converter, and will only be converted to bypass output to the load when the UPS is faulty, overloaded or overheated.


1. The power output to the load is processed by the UPS, and the output power quality is the best.

2. No conversion time.
3. Complex structure and high cost.

4. Strongest protection against utility noise and surge attenuation.

What is a line-interactive UPS?

The online interactive UPS is normally output from the bypass to the load, and the converter is now used as a charger. When the power is off, the converter converts the battery energy into an AC output to the load.


1. With bidirectional converter design, UPS battery recharge time is shorter

2. Have conversion time

3. Complex control structure and high cost

4. The protection is between the online and offline UPS. For the city noise, the spur attenuation is poor.

  How to choose the right uninterruptible power system (UPS) supplier?

1. UPS purchases the first-class equipment for stability, reliability and fast and convenient after-sales service.
2. A sound system of distribution services in all regions
3. Equipment factory has strong product development technology capabilities
4. The product has excellent characteristics such as high efficiency and low noise.
5. The original equipment of the equipment is well-reputed and financially sound
6. Products have passed the certification of foreign inspection agencies such as TUV, UL, CSA...
7. The factory has passed the certification of foreign inspection agencies such as ISO9001, ISO14000.  

How long does it take for the uninterruptible power system (UPS) to be powered?

The biggest purpose of the UPS is to provide the appropriate backup power to the load device when the power is abnormal. Therefore, the UPS standby time should be sufficient for the user to have sufficient time to deal with the contingency measures in the face of power anomalies. In general, 5-10 minutes of standby time is sufficient. In addition, if a longer standby time is required, an additional battery pack may be considered to extend the discharge backup time.

How to extend the power supply time of the uninterruptible power system (UPS)?

There are two ways to extend the power supply time of an uninterruptible power system:
1. Adding a battery box: The advantage is that the array battery can be added according to the required power supply time. However, it should be noted that this method will increase the battery charging time and increase the maintenance and space costs, so please carefully evaluate it.
2. Optional large-capacity uninterruptible power system: This method can effectively extend the discharge time and reserve future expansion of equipment.  

How is the capacity of the uninterruptible power system (UPS) calculated?

At present, the UPS that is sold in the market mostly uses VA as the capacity unit of the product. V is the voltage, A is the current, and V*A is equal to the power, which is the capacity of the uninterruptible power system. For example, if a 425 VA uninterruptible system has an output voltage of 110 V, the maximum current that the product can supply is 3.86. Exceeding this current means Overload. Another way to express power is W, W for real work, and VA for virtual work. The difference between the two is the power factor. There is no standard for the power factor, which is generally 0.6 to 0.8. This number should be considered when purchasing an uninterruptible power system.

Why is the UPS need grounded?

1. On the one hand, it can protect personal safety and prevent electric shock. On the other hand, good grounding is beneficial to eliminate coupling noise interference.
2. It is used for UPS and computer equipment in a separate grounding manner. The grounding resistance value is recommended to be less than 5峏. The material is selected as the first-grade product and the construction requirements are strictly required. The grounding point must be away from the lightning protection grounding point (at least 5 gongs).  

What is the impact of conversion time on the computer?

When an off-line UPS is used for power system conversion, there will be a conversion time, and how long is the conversion time? What is the impact on the computer? It is a question that customers often ask. The length of the conversion time varies from manufacturer to manufacturer, usually between 2 and 10 milliseconds. In the case of computers, when the power is interrupted, its own switching power supply should be able to maintain 16 milliseconds, so the conversion of the uninterruptible power system Time is acceptable to a typical personal computer.