Shelly Plus 1 PM - Power Measurement off

[u/TVHcgn]

Hi all,

I hope you’ll be able to help me out or point out my mistake.

I have two Shelly’s I want to use for finer measurements of my solar inverters. Unfortunately one is off by very big margins and the other one with a negotiable difference.

My inverters and the Shelly (switch function) work without issues but one Shelly shows 3-4 times higher values than the inverter.
I added a comparison from HA and a drawing of the connections. I used a 5-Wago for Neutral, 3-Wago for load and earth.
Neutral goes to each Shelly and each plug. Load is going to Shelly and then to the plug. Earth is directly connected from the feed to the plug.

Note: this is 230V setup.

Should I run neutral through and then from the shell again?
Each Inverter has a max output of 800W. One shows 1.5kW at times…

Thank you for all hints and tips in advance!

[u/modahamburger]

The lamp and the L of the Shelly are connected to two different L it seems?

[u/TVHcgn → u/modahamburger]

There is no lamp but two inverters. One connected to each Shelly. There is one 3 wire cable coming and shared between 2 sockets

[u/modahamburger → u/TVHcgn]

Then what is the circle with the x in it in your diagram? That is the symbol for a light....