I’m was aware there’s quite a variance in allowed voltages in the UK - I was more questioning that the IoTaWatt is reading slightly higher than anything else in the house.
Previously I was convinced that the electric meter was reading too high as the “instant/current” wattage reported always seems to be slightly higher than the IoTaWatt, however after leaving both devices alone for 24 hours the CAD is reporting 13.01kWh used and the IoTaWatt showing me 13.0kWh, so the meter still seems to be reading higher, even if the voltage is slightly too high on the IoTaWatt.
I have to be honest, I have very little trust in the electric meter - one of the main reasons I bought the IoTaWatt is because it told me last week I was using 2750kW (at £380/hour), and even previous to this it’s seemingly slightly higher than I’d expect.
I think I’ll wait until I can borrow a calibrated MFT to get known-good voltage readings and then calibrate the IoTaWatt to match that.
In the UK, we had a massive (if somewhat controversial) push to get everyone onto “Smart Meters”.
My current meter is a SMETS-2 smart meter which comes with a little wireless screen (powered by Zigbee, though they refuse to let you connect your own Zigbee device to it’s network to monitor it) which shows current (updated every 10 seconds) and historical usage from the meter as well as the cost.
It’s a nice idea, but considering it told me last week I was pulling 2.7 MEGAwatts of power (£380/hour), it’s certainly not without issue. Interesting phone call to the supplier, where they decided that the meter was sending them data so it must be working properly. (“but it’s over 11,500amps, if that was correct my house and everything between my house and the power station would be on fire!”).