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).