First i’d like to say how much i’ve enjoyed this amazing product over the last year. The software and online documentation are great and IotaWatt has taught me a ton about energy use patterns in my home. Kudos to the creator of this.
Recently, i noticed that there was an inconsistency between my current transformer (ECS25200-C2) and my main utility meter. After snooping, i noticed that a 120V / 20A circuit i monitor w/ iotawatt was reading higher energy use than each leg of the subpanel containing the circuit. The attached graph displays the measured energy use of both legs of the 200A subpanel (measured with 2 CT ECS25200-C2 s) along with the measured energy use of the 20A circuit on this subpanel (the energy reading on the 20A circuit was measured with an ECS1050 and this reading is completely consistent with the energy use i expect from the space heater using that circuit).
After finding this out, i went back and looked at the measured power use over a longer time period (2nd plot attached). My energy use patterns in the house didn’t change dramatically over the year, but it looks like in mid summer the CT ECS25200-C2 on one leg of my 200A subpanel drastically reduced in measured power despite the energy use patterns not really changing.
Is it common for these CTs to fail after ~ 6 months? Any advice on troubleshooting if this might be fixable since the CT does still seem to be registering a fraction of the energy use?