Lets use the 8 kw Sunsynk inverter as an example;

Data sheet specs.

AC output rated current 34.8 amps.

Max AC current 38.3 Amps

Max pass through current 50 amps.

The question is pass through were, the input to the output of the inverter when the relay is normal mode

The current input for the inverter and battery charging?

The pass through current for the solar.

If it is the pass through current from the input to the output, then you would need to run at least 10 mm to the inverter and out of the inverter?

You would have a 50 amp breaker feeding the inverter and a 50 amp breaker on the output. Which means that a 63 amp bypass switch would have to be used.

One of the most common inverter warranty claims were damaged changeover relays in the inverter.

The only way this confusion will ever get cleared up is when someone, draws a picture which includes the internal relays showing how the pass through current can travel through the inverter.

I stick to a 50 amp input breaker and a 32 amp output breaker, that way I cant see how we would ever have a warranty claim for damaged relays inside the inverter.