The next partial solar eclipse in Central Europe and other countries will be observable on October 25, 2022 and will significantly reduce the solar power feed-in from photovoltaic systems. Weather forecasts do not routinely include such rare extreme events. Therefore, experts from Fraunhofer IEE have developed and validated a flexible solution. They want to be able to combine the degree of coverage specifically for the location and time with all the important weather forecasts. In this way, the aim is to optimally adapt the regional and local PV feed-in forecasts in the future and reduce errors. The prior estimation of a solar eclipse must be possible purely on the basis of previously known data. Even with a persistence forecast (clear sky index) one can easily continue the daily cycle of global radiation or photovoltaic feed-in beyond a solar eclipse. The effect of the solar eclipse can be slower and smaller than the influence of changing cloud cover, but in any case it plays a significant role in the result. Volatile self-consumption also has a massive impact on the feed-in profile of PV systems. This must therefore be treated and forecast separately.