Originally posted by J.P.M.
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Until the STC Wattage of an array exceeds the Wattage of the inverter, the usefulness of using inverter size in a ratio is not meaningful.
However, in the context of the title of this thread, which is about oversizing, an additional analytical tool may be useful to some people. I am not suggesting using that ratio as a dasign tool, I view it as an analytical tool to understand performance. For example one poster here, has a system which has a very high DC to AC ratio which on the surface may appear suboptimal. That poster has a dufferent cost per installed Watt of panels and inverters. Therefore he may have a different financial tradeoff in terms of optimal mix of components.
That is the way I learned financial analysus and how to use financial analysis as tools. The concept is to apply them where they can be useful to the analyst in evaluating the performance of a system. That may explain why commercial solar installations may use a different ratio and why that ratio may be irrelevent to most users here.
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