Uninterruptible power supply system, generally used to protect important equipment, such as: computer equipment, precision instruments, medical equipment, etc., due to the UPS R & D design to computer-based, not all loads are applicable, especially inductive loads, such as fans, air conditioners and other home appliances are not applicable, because inductive loads will have a reverse electromotive force, for the offline UPS will be harmed. In addition, such as copiers, laser printers and other start-up current equipment, because of its instantaneous start-up current, if the UPS capacity is insufficient, easy to cause instant overload, once the utility interruptions, the UPS output is also interrupted. Normally, when the UPS is overloaded for a long time, it will shorten the life of the electronic components and the UPS.
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