It won’t account for a single days performance no but might be better representative of your system if you are seeing on average estimates that are too high. As your system is new and if is without shading (at this time of year), the install date method might be more accurate. This is something that definitely changes system by system.
We’ll continue to monitor our validation and appreciate you posting your PV system actuals here, feel free to update us at the end of this month which will give us a bigger sample of days after the change that we can dig into after that. At this stage, we aren’t seeing larger representative errors that I’m aware.
We do indeed estimate and forecast cloud opacity (density) which you can see on the
/radiation/* endpoints (both forecasts and estimated actuals). Eg,
The ‘estimated actuals’ seem to reflect your cloud/sunny descriptions at your location for recent days, remembering that these are based off our satellite cloud detection. Like wise with 0-4 hour forecasts, beyond that we rely on other data sources for our systems. For Europe, our forecasts are updated every 15 minutes, and for some use cases, it can be better to perform more regular forecasts to get the best results.
Would still be interested in any data from your system that you would be willing to share here or to our support email.
Hope that helps.