There was an article today at a Belgian newspaper that there is an increase of complaints of sending excess power back to the grid from solar panels.
In short , if the grid of your area is overloaded it stops kinda delivering and it can cause extra issues.
Translated excerpt (Google Translate, so spelling/grammar mistakes posssible)
More and more complaints about solar panels that fail when the sun shines
Grid operator Fluvius has already received 2,397 complaints about failing solar panels this year. That is 65 percent more than last year. Opposition party Groen believes that Flemish Energy Minister Zuhal Demir (N-VA) should take control himself to solve the problem. “You cannot explain to people that sustainable energy is the future, while solar panels fail when the sun shines,” says Flemish MP Staf Aerts.
Owners of solar panels hope for a lot of sun. Except, of course, if the inverter of their installation always fails. This is a kind of protection when the electricity grid can no longer process the excess electricity produced. Since it then takes a while before the installation is active again, the owners lose a lot of power.
The problem mainly arises in areas where many installations are located together or where the electricity has to travel longer distances. As a result, in sunny weather, the excess electricity produced cannot be properly processed and the installations fail.
With this article, you could start wondering how much electricity simply is lost … cuz the grid can’t handle/process it…