Our house has a single phase supply. During the last year shelly EM measured only 2600 kwH consumption in the same time the supplier measured more than 3600 kwH. It is hard to find out what is the source of this big inaccuracy, and how could it be improved? The wire from current transformer is short to avoid unwanted induction and noises. The power factor is never over 95% even if I connect 3kw resistive load. The wire through the current transformer is a standard 10 sqmm copper. ( probably makes no difference)
What should I try to improve the measurement accuracy? Improve power factor determination ? Or the current measurement?