Inverter marking and accurate power

How do inverters measure efficiency?

These deviations have a proportional effect on the derived measurements. The efficiency specified for the inverter is determined using a high-precision measuring process and represents the ratio of the output power to the input power during nominal conditions. These specifications are also verified by independent testing institutes.

How can a motor drive inverter be used to measure power?

For motor drive inverters, which convert DC power to three-phase power, higher-precision power measurements can be made by securing the necessary measurement bandwidth, applying phase correction, and selecting dedicated accessories that apply to the higher frequency components and noise effects caused by PWM and current sensor errors.

Do inverter's measuring devices meet the high standards of calibrated measurement equipment?

The inverter's measuring devices do not meet the high standards of calibrated measurement equipment. The inverter's measuring channels may have a tolerance of up to ± 4 % for DC measurements and up to ± 3 % for AC measurements (based on the respective final value of the measurement range under nominal conditions).

What is the tolerance of an inverter?

The inverter's measuring channels may have a tolerance of up to ± 4 % for DC measurements and up to ± 3 % for AC measurements (based on the respective final value of the measurement range under nominal conditions). As a result, the relative deviation may (also) be correspondingly larger if the feed-in power is low.