TOP What happens on cloudy or overcast days, when the sun isnt shining?
In remote, off-grid applications, a PV system is connected to a battery storage system as a backup power source. In grid-connected applications like the SunRoof FS, the PV system works in parallel with the utility power grid. For example, when building electricity demands exceed the solar power output, the local utility makes up for the shortfall. Conversely, when the PV system generates more energy than the building requires, the excess power is exported to the utility grid; you actually put your electricity meter in reverse!
