I’ve been using the Shelly 3EM for monitoring my home’s energy consumption, and while it’s been a great tool overall, I’ve noticed some discrepancies in its measurements. Specifically, the device reports a significant amount of standby power consumption from my induction cooktop, which seems unusual. After some research and testing, I suspect this might be due to the device’s handling of non-sinusoidal currents, which are common with modern appliances like induction cookers.
I decided to test this theory by connecting the cooktop to a professional-grade meter, and the results were quite enlightening. The Shelly 3EM overestimated the actual power draw by a considerable margin, which is concerning given its price point and the expectation of reasonable accuracy. While I understand it’s not meant for billing purposes, I believe a margin of error within 5-10% should still be achievable.
I’m curious to know if others have encountered similar issues or if there are workarounds to improve accuracy. Have you found any settings or configurations that help mitigate this problem? I’m also wondering if this could be a hardware issue specific to my unit or a more widespread problem. Any insights or experiences would be greatly appreciated! Let’s discuss and see if we can find a solution together. 