Thinking of using Splitter Trough to avoid up-sizing main breaker panel

[Ampster]

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Can you elaborate a bit on the "I used a wiring trough to add a subpanel that I derated so i did not exceed the buss capacity of my main panel." I don't see what you're doing with that.

I have a hybrid inverter which required a separate critical loads panel and my GT solar is connected to that sub panel as well as the hybrid inverter. The subpanel is rated at 100 Amps but is fed with a 70 Amp breaker. The sum of the breakers on my main panel do not exceed the capacity of the main panel busbar. Instead of conduits, I used wiring troughs to connect the panels so I had flexibility in moving circuits. The reference to the trough was just the mechanical method of connecting the panels, nothing magical.

[2PVorNotToPV]

Thks, Ampster.

In this case the wiring trough would be between the util meter and the main breaker panel.

Can you elaborate a bit on the "I used a wiring trough to add a subpanel that I derated so i did not exceed the buss capacity of my main panel." I don't see what you're doing with that.

[Ampster]

Are you talking about a line-side or a load-side tap? There are a lot of workarounds depending on the code in your area. I used a wiring trough to add a subpanel that I derated so i did not exceed the buss capacity of my main panel. It is more about the calculations and less about the mechanical boxes and troughs.

[2PVorNotToPV]

Is it a dumb idea to install an exterior splitter box / trough where a person can land the solar output so that you can avoid up-sizing the main breaker panel? This is for a grid connected system.