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.
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.