One of the problems of using the UPS in conjunction with a backup generator, Rectifier, UPS series in Harmonics Current flowing through the Source Impedance, such as transformers and generators in addition to problems of high heat and will cause a Voltage Distortion at the bus bar that is up to them. To resolve this problem, you can do this in 3 ways:-Increase the size range of power (Increasing Rating.)-Install the Filter between the Harmonic power with Rectifier.-Select a generator with less Internal Impedance values. .Considering the size of the UPS coordinate1. the size, power requirements (Load kVA) depends on various factors:A size of the burden voltage coordinates. electrical installation with electric backup system.B Power Factor value of the power burden. all. Is important because manufacturers often endorse UPS the Power Factor 0.8 lagging up to 1.0?C., while Star power of the appliances here are in the system. In General, the UPS can power up to 125% of rated for at least 10 minutes. Table 1 shows the information. Power Factor and load Current Inrush of power.2. the level of voltage, and the number of the phase of the backup power system.3. the installation of the electrical load, phase equilibrium. The case of three-phase power system will reduce the power of the UPS coordinate size down, in part because of the size of the coordinates must be based on the use-phase input power Max.Considering the battery life (Battery Selection).5 key factors to consider:1.Discharge Rate (kW/cell) power supply rate of the battery pack should correspond to the maximum power demand of the Inverter to be able to afford the voltage (Output Voltage) according to the coordinates. When the pressure level for DC from the battery has a minimum value (Minimum DC Voltage Input).2.Service Battery Life Time value of life that can be used until the Capacity of the batteries decrease is lower than 80% (according to the instructions in the IEEE 450).
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