@gohan said in Whole house power monitoring.:

https://openenergymonitor.org/forum-archive/node/58.html then you add the mysensors code for communication.

+1 to that
I have been using a single clamp sensor on my neutral at the power meter (SCT-030) hooked to an arduino/ESP8266
It's been working great close to 3 years now with an accuracy of +- 7%
I even use the readings to detect brown-outs and trigger devices to original state after power flips back to mains from the back-up (I live in an area where brown-outs , or power-cuts as we call them , are quite common)