There is nothing particularly new about the concept. What is new is producing it as a standard module that is designed to fit into most homes with minimum effort. Producing a standard module enables this to be mass produced, rather than every installation being a custom design, so that both the system and installation costs should be reduced.
As suggested, it is specifically aimed at houses which already have solar PV collectors, and is primarily intended to extend your use of solar power collected during the day into the evening peak. This both avoids paying peak power rates, and reduces both the peak network consumption and peak feedin during the day when nobody is home, thus reducing the demands on the network resulting from both of these peaks.
John
