I'm new to this forum, but have been looking to find out who makes this box. The owners of the house weren't in when we were doing some wiring, but this thing controls a standard 3kW immersion heater directly. The panels are only 2kW capacity, so my guess is that some electronics must turn down the mains to the heater element. There is nothing between the box and the immersion heater, which is rated at 3kW.
How can you run a 3kW heater with a 2kW solar panel, and still not draw grid power? Beats me.
But does anyone know who makes this little unit?
Sorry about the pic quality- taken with my phone...