Grundfos IO 101-115v Interface Box The IO 101 switch box is designed specifically for solar powered SQFlex systems.The IO 101 enables the connection of a generator supply backup in case of insufficient solar radiation.The switching between solar power and generator mus tbe made manually.When the generator is stopped manually or runs out off uel, the IO 101 will automatically switch to the solar energy supply.The IO 101 functions as a connection box joining all necessary cables.