I’m trying to find a some neat solution to monitor multiple phases at home. So far I have made several single phase fully DIY wattage monitors based on ACS712 and arduino/ESP8266. The grid here is quite stable so after calibration I usually manage to get values in 10-20W error margin without extra voltage calibrations or similar. Also I use good quality 230V->5V transformers in my project so they tend to have stable outputs. So now I have soon all the important single phase household machines monitored (washing machine, dishwasher, fridge/freezer, always on computers, air heatpump etc). The whole home power usage is monitored by blink/pulse monitor. Now however, I would like monitor the three phase bigger appliances with some solution which wouldn’t require that much of DIY (yes, I’m getting old). These appliances are:
- Main heat pump (3x16A)
- Sauna stove (3x10A)
- Stove/oven (3x16A)
Main fuses are 3x25A. So what I’m trying to find is:
- Solution which would be on hardware level more like a plug and play. I want to avoid calculating resistors/components, calibrating every sensor separately, soldering tons of cables/connectors and designing & 3D printing cases and stuff. Shortly in this project I’m more interested of the information than building it from scratch.
- Solution which is somewhat open source that I can connect it to my Domoticz which is currently acting as hub/collector for my home automation. Some nodes connect directly to Domoticz, some via MQTT or MySensors.
So what would be your pro suggestions? I have used emon sketches and algorithms as a base in some of the above projects so I’m somewhat familiar with the concept. However, the biggest drawback with currently purchasable emon lineup is that they use 100A CTs. As I noted above my biggest single phase amperage is 16A so 20-30A would be a better choice or even 50A. Moreover when Arduino has 10bit analog to digital converts (and if I’m understood right only 0-1V is acceptable) it sounds to me that the precision wouldn’t be very good.