Review on 📊 Enhanced Accuracy and Convenience: Efergy True Power Meter with Voltage and Phase Measurement, No Wi-Fi Needed by Rance Riley

This unit is well built, easy to install and does exactly what it says on the tin. If you're looking for an energy monitor that compensates for power factor to give you the most accurate readings, this product is your best bet right now. Unlike most other power monitors, this product includes a power supply that powers the transmitter and lets you monitor your line voltage for greater accuracy. The adapter is molded on at one end and fits directly into the cutout in the main switch panel (see photo). One wire coming from the adapter can be connected to an existing circuit breaker and the other wire can be inserted into the open slot on the neutral bar. The kit also includes a grommet for the second connector of the current sensor cables coming out of the main panel. Overall it's an easy install and the product comes with everything you need. I have both and an OWL CM119A. In terms of construction and ease of installation I would say they are similar. The Efergy TPM requires additional work to install the power transformer, but in return you get more accurate readings and don't have to change transmitter batteries. As another commenter mentioned, the current sensor wires are short but about the same length for both devices. I'm using Efergy and Owl with a homemade surveillance system on a Raspberry Pi computer with USB. key rtl-sdr. People have posted code to decode HF transmissions for both Owl and Efergy. Efergy uses a more complex FSK modulation with 16-bit CRC, while Owl uses Oregon Scientific v3-compatible Manchester encoding. The Efergy protocol is probably more reliable but requires some extra code compared to Owl and can be a bit more CPU intensive on the Pi (my app uses 20% CPU to decode these two sensors along with 6 other temp/humidity sensors) . . Efergy transmits at 10 to 20 second intervals, while Owl transmits between 6 and 60 seconds depending on the current changing. Google efergy decode or owl decode for example decryption routines. My code is hosted on github under rtl-wx.