Hi all,
I bought a sonoff powCT and installed it. I have the latest esphome firmware on it, and configuration taken from Sonoff POW Ring (POWCT) | devices.esphome.io
Works fine but I don’t think it accurately measures power correctly. The config doesn’t seem to have any calibration params or such. I’m looking for tips or advice. My house has a 4kw geyser but the HA power levels never go above 2kw. My utility meter also outpaces HA “total daily energy” values. How would I diagnose it?
Thanks.
Hi,
I have the same problem. I had an electrician come out. The mains measure 235w and when the 3kw geyser kicks in, the house measures 1183w. I happen to have a spare with the stock firmware on. That device with the same testing measured over 4kw. Oh and when exceeding the 4kw, the ESPHome flashed POWCT actually drops it’s reading to 537w
Did you happen to find any solution?
Sorry for the late reply. No solution yet, my electrician tells me the other wires are likely interfering. I had installed the unit in my db board. I might try place it out of the box closer to the utility box, where no other wires could influence it. I also wonder how far the N wire has to be from the clamp placed over the L wire. Maybe there is a min distance to stop the N from interfering with the clamp?
Also I tried removing this from the config on the w_sensor:
- lambda: return x / PI;
But it didn’t seem to help. I’m not sure why that config is needed though.
I’m going to test it on a plug by itself, against a kettle or such, to see if it is accurate there at least.
This PR patch fixes all my issues: