System and method for connecting and fixing framed solar panels to make a weatherproof building-integrated modular surface for the substrate batten. The system comprises connecting means comprising a top strip manufactured on the basis of the U-profile, a left-side strip, and a right-side strip, whereas the side strip is configured to engage the adjacent side strip configuration and mounting brackets of various shapes. Optional extended top strip and side strip extension strips are also provided, with which the modular surface made of framed solar panels can be extended in both height and width, if necessary.