- Decide between offline, line interactive and online functionality:
- Offline UPS will only provide back-up in blackout situations.
- Line interactive will provide back-up in blackout as well as during Sags, Spikes, Surges, Noise and Transient situation.
- Online UPS provides the maximum level of back-up and protection under all circumstances.
- Consider the requirements of power quality.
- Understand the current capacity of UPS and consider the future expanding.
- Limit your choice to brands with a good reputation.
- Choose UPS based on your requirements.
a. What are important items you should evaluate when buying an UPS?
- UPS reliability and stability.
- The excellent engineers and the ability of products creation.
- High efficiency and low noise.
- Suppliers reputation and financial situation.
- Check that the product has a valid CE approval by the European Community.
- Manufacturer certifications such as ISO9001, ISO9002, and so.
b. Do I need UPS when I live where seldom power failure happens?
Power failure is just one of power problems that can occur in a home or office. Other power problems such as high voltage, low voltage, and spikes are more important and often go unnoticed. The purpose of a UPS is to provide customers the necessary protection against some or all of those problems. A UPS can also provide extended back up time (back up time depends on the user’s energy consumption and the capacity of the UPS).
c. What could I use for the RJ11 connector on the rear panel of UPS?
The RJ11 connector is used to protect the phone line. Hence, you can connect your phone; fax machine, modem and ADSL with it for better protection.
d. How many kinds of Power problems?
Besides the blackout (no power available), there are other power problems like Sags, Spikes, Surges, Noise and Transients that can damage a PC or other high technical equipment, as well as shorten their usable lifetime.
e. What kinds of equipment should I use with the UPS? Is there any limit for it?
Normally, the UPS is used for PC, high technical equipment & medical appliances. Since most UPS are designed for PC and similar devices, not all kinds of equipment can be connected to it. Copy machines and laser printers that have big starting current also could not be used with UPS, since the huge starting current might overload the UPS’s capabilities. Special care must also be taken with capacitive or inductive loads such as those of cooling fans, refrigerators, and any equipment that includes motors, compressors or pumps, since these kinds of loads will damage the UPS.
f. What is the impact of different output waveforms?
The most common waverforms are Simulated-Sinewave and Pure-Sinewave. There are three major types of loads: Resistive load (Lamps); SPS load (PC power supply) & Conductive Load (Motors). All the types of load can be used with Pure Sinewave. However, only Resistive and SPS loads can be used with Modified Sinewave.
g. What is the impact to the PC with different transfer time?
Except On-Line UPS, all other UPS have a short transfer time of 2ms to 10ms to switch from AC Input mode to battery mode (OFF-LINE UPS & LINE INTERACTIVE UPS). Since this transfer time of 2-10ms is shorter than the hold-up time of a good-quality PC PSU, there should be no problems when a blackout happens. The power supply of PC can continue working for around 16ms without input power, so most PC will still work functionally when the short transfer time occurs (please note that this will heavily depend on the quality of the power supply used).
h. What is the battery type of UPS?
Most UPS use Lead-Acid maintenance-free batteries. This kind of battery is sealed so the UPS can be installed in any location without causing problems due to gas leakage, so it does not pose a threat during charging and discharging. So it also could be an indoor installation.
i. What is the lifetime of batteries?
The battery lifetime depends on the ambient temperature and frequency of charging and discharging. Higher ambient temperature and frequent charging and discharging will reduce batteries lifetime. We offer one year battery lifetime guarantee. However, the battery lifetime is close to two years under normal use.