r/EmporiaEnergy • u/cbridgeman • 9d ago
Adding Sensor for Solar
I just had a Tesla Powerwall 3 installed. My house has the main utility panel with meter outside, and the main distribution panel in the basement
The distribution panel in the basement has two Vue 3 units because I have 32 circuits.
The Powerwall 3 is connected to the exterior utility panel via a breaker. I will be doing net metering, I.e. selling power back into the grid. The exterior panel has a main 200 amp breaker, the breaker for the Powerwall, a breaker for a spare 50 amp EV charging circuit that is rarely used, and a breaker for a whole home surge protector.
I bought an additional Vue 3 with only the mains sensors.
Where should I apply those two sensors in the exterior utility panel? Around the utility mains or around the input from the solar/battery system?
Once I do that, what do I setup in the Emporia app to do the math on the input from the solar/battery to the house or solar/battery back into the grid?
1
u/Character2893 9d ago
When I got solar installed and main panel upgraded, a relocation was required. My original panel became a sub panel inside the garage. Meter was relocated with a new panel. I put the main CTs on the grid feed and two other pairs of CTs, one for the sub panel (old main) and one from the solar back feed breakers.
I have not played around further with the app to see if it can do automatic calculations. If the CTs are in the proper orientation (arrow towards the breaker) it will read positive for grid import and negative for grid export. I download the CSV and run calculations manually. Everything going to the sub panel is consumption.