Hi there - first time poster, new-ish user... I'm interested to know what users' confidence level is with estimated specific yields for systems that are heavily oversized on the DC size, that have a DC:AC ratio of, say, 1.4:1 or greater. With crystalline modules cheaper than ever, this is becoming common practice, but there can't be much empirical evidence of how effective it is. Some inverter manufacturers are publishing white papers that utilise PVsyst simulations and are showing almost-linear increases in specific yield as DC-side installation increases. The point at which the additional saturation losses outweigh the additional production elsewhere must eventually come, but the more immediate question is at what point do the incremental increases in production become too expensive to justify, even at $0.50/W or whatever the utility-scale price-point of PV modules is these days. Can anyone at PVsyst (Andre?) comment on what, if any, empirical research is being done to verify the model's outputs? I'm thinking of putting together a 'small' research project that attempts to quantify at least the incremental gains vs. increased saturation losses question, and would be interested to know if there are any specific parameters that PVsyst would want to be sure were covered in order for the findings to be considered useful for use in making any adjustments to the tool. Thanks to any and all who respond! Ian in Ontario.
