How to choose the right UPS Many dealers do not understand the differences between one UPS and another, let alone the end users. If the user environment has a generator supply and when there is a power failure, they must ensure that the UPS has the Automatic Voltage Regulator (AVR). When a power failure occurs, there is switch over time from generator to regular supply, the UPS must be able to take over immediately. However, if the UPS does not have the AVR, then it is unable to cater to the extreme high and low voltage that occurs. In this instance, the UPS will either stall or beep continuously signaling a malfunction. AVR is important for the reliability of the power supply that comes with the PC casing. Too much high and low will blow the supply eventually. Switch overtime Most off-line UPS do not have any feature for trickle charge to the battery. Thus when there is a power failure, it will take some time to switch over to battery mode. This will cause hard disk failure and might result in a loss of data or to a serious extent, cause a hard disk to crash. Power Tree UPS, equipped with this feature, is able to have a zero switch overtime, thus maintaining the revolution speed of the hard disk and protecting the flow of power supply to the CPU. Short circuit protection Power Tree UPS with this feature ensures that should there be a wrong connection either to the main power point or wiring in the PC, the UPS is protected and all components will be well preserved. To test this feature, short circuit the live and neutral with the UPS plugged into the mains, the office circuit breaker will be activated. This will prevent other equipment from damage. Battery and components There are manufacturers in the market that claimed they are using suitable battery for the UPS. Always check that the UPS is at least supplied with a 7AH Battery for the lowest model of a 600VA UPS. Many UPS in the market are powered by only a 5AH battery which will not be sufficient to supply the correct VA to the equipment as POWER=W. Some manufacturers also cut cost by using less Field Effect Transistors (FETs) on the circuit boards. FETs offer crucial support to the output VA when there is a power failure. If inappropriate or insufficient FETs are used, then the UPS will be overloaded and the circuit board will be damaged easily. Power Tree supply end users with a 3-year warranty on all our motherboards and a 1-year warranty for our battery. Please note that our distributors may give a varied warranty depending on each country's policy.