It's solar so you can literally just unplug it. Although at the scale of an individual house you can just unplug (or otherwise deactivate) pretty much anything. It's the industrial scale stuff that can't be adjusted on a dime.

I could probably make a small PCB with a light sensor, that disconnects the solar panels (through a relay) once sunlight hits the sensor. So you aren't paying any fees for supplying the grid with energy.