I’ve bought an emonTX with 4x 20 A CT clamps, to measure a couple of energy hoggers (PHEV, heat pump for a small plunge pool etc).
Since I already have a server running for other stuff, I installed emoncms on that, and hooked up emonTX to an esp8266.
All connections work work just fine and I get data into emoncms… But… The readings seem way off. The car charges with 1200 W according to emon, which should be impossible due to time it takes to charge, and the size on the battery. 2300-2400 W would be reasonable.
The heat pump should draw around 700 W, but only 200-250 W is reported.
I’ve added x0.267 in emoncms according to the web shop for the 20 A clamps.
I’m using the AC/AC for voltage calibration, although it reports about 250 V, when around 230 V, or slightly higher, is expected.
Any good ideas what I might be doing wrong?