Out of curiosity, with my non-educated guess, why cant your system drop or stop producing electricity when it overloads the system? This way at least you can power your residence with solar power and drop the excess. Of course it’s stupid of the energy grid/infra company’s inability to “buy” cheap electricity. But at least it’s not a huge loss for you.
It’s not stupid to shut off overproduction from flooding the grid just as it’s not stupid to shut off your tap when the bathtub is full. What is stupid is building so much solar that there is no where for the energy to go during peak production hours. Everybody is gung ho to put cheap panels on their roof but no one is footing the bill for adding storage without which all that power production just goes to waste.
> What is stupid is building so much solar that there is no where for the energy to go during peak production hours.
That's not stupid at all, it's unavoidable if you want to still have enough energy when you don't have peak production. Given how cheap solar is getting, it may even be more economical. And you always have the option to add storage later, when it becomes more economical (which it isn't yet).
It sounds like it's grid-tie only - so it just shuts down when the local grid is over-voltage. Ideally you'd want something that could run in an isolated mode, if only to supply power to something useful like an electric water heater.
Problem these days are 90% or more of the residential solar sold in the U.S. is only AC-coupled and nowadays only use micro-inverters. Meaning, when the grid goes down your solar is shut down as well. Modern inverters following standard UL1741 also will de-sync from the grid just from a signal from the PowerCo through frequency shifting to shut down your solar and require your house to go in grid-only mode (when the grid has too much solar production).
Isolated DC-coupled solar is mostly done by DIY folks with inverters like Sol-Ark that can do AC or DC-coupling and can work when the grid is shutdown. Your solar constantly charges your batteries and powers your house as a microgrid. Any excess power COULD be sold back to the grid, but to avoid the added hassle of interconnection agreements, most just store it into a larger battery bank for rainy days. The goal here is to fully zero out your monthly power bill AND be self-sustaining.
