Solar Inverter AC-DC ratios for Utility Scale projects: As anyone implemented AC to DC ratio greater than 1.5  for commercial or utility scale solar project?

Not sure if the inverters can handle the voltage stress and impact the warranty.

I think the optimal ratio should less than 1.30

If you use PVSYST you can export to Excel and look at the hourly AC output of the inverter (which is what I do). At a 1.5 AC/DC ratio you will have so much clipping that you will see a great deal of energy waste. I have seen many large solar companies design their systems in the 1.25 range. Part of the ratio consideration is the location of the field. You will want a higher ratio in the hot deserts and a lower ratio in the cooler climates (and provide overhead shade for the inverters, the hotter the electronics the lower their lifespan).

I interpret your statement of "solar inverter" as a DC to AC conversion, which means that you are "inverting" solar power DC to sinusoidal power AC. In this case the choice of higher ratio of conversion more than 1.5 say 2.0 is more economically advantageous and efficient than the lower ratios that were mentioned on the previous discussions, considering the inverter rating, the conductors, the switching equipment current rating, and the electrical code requirements.