[Gareth]

Well since I didn’t get a response I went ahead and tried it anyway, and the good news it seems to work.

I put a CT on each of the hot for the wires going from the inverter to the subpanel since many of the loads are 120V so unbalanced. I entered these with a multiplier of -1.0

I put another CT on one of the hots for the circuit feeding the inverter. I didn’t check to see whether it is balanced but it seems to be close enough. It has a multiplier of 2.0 and set up as bi-directional

I combined all three circuits in the Emporia app as a ‘Solar/Generation’ circuit

It now shows me a pretty accurate reading of my solar net of any loads powered by the inverter, at least compared to the display on the inverter.

When PV is off (nighttime) it shows me (close to) zero. I assume the inverter has some standby load.

The only thing I haven’t tried yet is loads in excess of the PV (example 3 above) but I think it should work.

I can still see my ‘net production’ back to the grid (net metering) which with my house’s base load is usually a few hundred watts less than my PV production.

[Gareth]

Can we customize the way the multiple circuits values are added together?

I have a hybrid solar inverter which is connected between my main panel and the subpanel. The power can flow bidirectional (either feeding back to the main panel / grid or pulling power from the grid when there is no solar). I would like to use the Emporia Vue 2 to monitor the total solar production after the loads are accounted for. Right now I’m only able to measure the Net Production for the whole house via the 200A CTs on the main panel.

The feed from the main panel is split phase 240V so I guess I would need a pair of 50A CTs to monitor this, let’s call this circuit A. This number would be negative when there is solar production exceeding the loads and positive when there is no production (just like the 200A CTs on the main panel are now).

The subpanel is connected to the load side of the inverter. I assume would connect a second pair of 50A CTs to monitor that circuit, let’s call that circuit B.

So my total solar production (T) should be represented by the formula T=A-B

Example 1 – 3kW Solar (A=-2), 1kW Loads (B) = Total solar -3kW

Example 2 – 0kW Solar  (A=1), 1kW Loads (B) = Total solar 0kW

Example 3 – 1kW Solar (A=2) , 3kW Loads (B) = Total solar 1kW

Can I use the logic in the app/software to show these results?

 

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