It won't. These systems are quite large (a single solar panel is approximately 1.2m by 1.7m (4 to 6 ft ?) and even if you put it outside with direct southern ex

It won't. These systems are quite large (a single solar panel is approximately 1.2m by 1.7m (4 to 6 ft ?) and even if you put it outside with direct southern exposure and no shade it takes 2-5 years to recoup the investment cost. In the US, you pay less for electricity (in most places) so it would take longer. Behind a window, generated energy will be way less.