How to calculate the power saving of frequency converter?
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How to calculate the power saving of frequency converter? Can it only be calculated through the power meter?
The problem is the usage situation. The pump has its own algorithm, and the fan has its own algorithm. Many inverter manufacturers have energy-saving calculators on their websites. For example, ABB, you can just go to their website to calculate it.
I agree with 2L that the water pump uses water at peak and low peaks. The power frequency works at full speed, and the variable frequency works at low speed according to the pressure. Thereby saving. . .
It is generally calculated through the watt-hour meter. If you don't look at the watt-hour meter, how can you know the specific number of energy saving? Generally speaking, frequency converters are mostly used in loads with high variability to save energy. For example, pumps, fans, water pumps, etc. used by chemical companies usually need to adjust the speed according to the actual process requirements to achieve the actual pressure.
Electricity consumption is the most direct method. However, some benefits of applying frequency converters cannot be calculated. For example, it can achieve stepless speed control and reduce mechanical impact.
Count a period of time before installing the watt-hour meter without using the frequency converter, and count the same time after using it. Compare the two to know how much electricity is saved. This is more accurate.
How high is the accuracy you need? If you only need a rough estimate, you can usually pay attention to the operating load of the circuit before using the frequency converter (can be calculated based on the current), and count the operating load after using the frequency converter (can be calculated based on the speed and the nature of the load, or based on the voltage and current output by the frequency converter). The former minus the latter is roughly the power saved. Of course, if higher accuracy is required, it is best to install a watch!