How to Choose a Right UPS Inverter?
An inverter, it has to be an inverter to be called that. It is directly different from the transformer, that is to say, the inverter can achieve DC input, and then output AC, the working principle is the same as the switching power supply. But the oscillation frequency is within a certain range, for example, this frequency is 50 Hz, the output is AC 50 Hz. An inverter is a device that changes its frequency.
UPS inverter is a device that provides backup power to electronic equipment. It is mainly used to provide uninterrupted power supply to some equipment which requires high stability of power supply. An uninterruptible power supply (UPS), offers guaranteed power protection for connected electronics. Pure sine wave ups inverter can be used in PC, TV, refrigerator, digtial products and home appliances.
In the following, ATO store will introduce how to choose the right ups inverter.
- Rated output voltage. Within the fluctuation range allowed by the specified input DC voltage, it represents the rated voltage value that the ups inverter should be able to output. The stability accuracy of the output rated voltage value is generally specified as follows: in steady state operation, the voltage fluctuation range shall be limited, for example, the deviation shall not exceed ± 3% or ± 5% of the rated value. The output voltage deviation shall not exceed ± 8% or ± 10% of the rated value under dynamic load mutation or other interference factors.
- Output voltage imbalance. Under normal working conditions, the ups inverter output three-phase voltage imbalance should not exceed a specified value, generally expressed by "%", such as 5% or 8%.
- Waveform distortion of output voltage. When the 3000W ups inverter output voltage is sinusoidal, the maximum allowable waveform distortion should be specified. Generally expressed as the total waveform distortion of the output voltage, the value should not exceed 5% (10% is allowed for single-phase output).
- Rated output frequency. Inverter output AC voltage frequency should be a relatively stable value, usually 50Hz power frequency. The deviation should be within ± 1% under normal working conditions.
- Load power factor. It represents the capacity of the inverter with inductive load or capacitive load. Under sinusoidal conditions, the load power factor is 0.7-0.9 and the rating is 0.9.
- Rated output current. It represents the rated output current of the ups inverter within the specified load power factor range. Some power inverter products give rated output capacity, expressed in VA or kVA. The rated capacity of an inverter is the product of the rated output current when the output power factor is 1 and the rated output voltage is the rated output current.
- Protection. Such as over voltage protection. For ups inverter without voltage stability measures, there should be output over voltage protection measures to make the negative intercept from the damage of output over voltage. And over current protection, the ups inverter over current protection, should be able to ensure that the load short-circuit or current exceeds the allowable value of the timely action, so that it is not damaged by the surge current.
- Starting characteristics. It represents the ability of the ups inverter with load starting and dynamic performance. The inverter should be guaranteed to start reliably under rated load.