I’ve tried to interpret the inverter spec sheet but with the dual MPPT it makes it a little harder to read.
What does stand out is:“Activation voltage "Vstart" [V]: 200 nominal (adjustable within the range 120Vdc-350Vdc, independently/each input)”
It is possible that the 5 panels do not create a sufficient voltage to trigger the MPPT to activate.
As you’ve mentioned:
netjam wrote:VIN1 173V
If the nominal 200 setting is still used then I believe this would explain it. Others may want to comment first but I would be discussing this with your installer and suggesting configuring a lower setting for MPPT #1 if they agree.
I would assume the choice of splitting the panels as 5 and 10 is due to physical layout on the roof. With non shaded panels all facing the same direction there might be a better split to use electrically to improve your inverter’s efficiency or possibly avoid running close to operating limits.
Others have discussed software that allows you to model your system’s efficiency based on panel specifications. It might be worthwhile seeing whether a different configuration would improve your situation although providing a photo, such as from nearmap.com.au, might help us highlight any potential pitfalls.