NOVELTY - The system has multiple solar modules (30) adapted for generating electrical power from sunlight and mounted on a deck (14) of a roof (10) to form a bank of solar modules with an irregular edge i.e. inside corner or interior horizontal edge. The solar modules and an edge treatment unit are formed with same size, same aspect ratio and same top surface coloring. The edge treatment unit is adapted for installation adjacent to the irregular edge and cutting away a corner to smooth the irregular edge of the bank of solar modules to a regular outside edge.    USE - Roof-mounted solar power system for being placed on a shingled roof of a structure such as industrial buildings, commercial buildings and residential home, for generating electrical power from sunlight.    ADVANTAGE - The bank of solar modules and dummy panels are formed with a smooth and uniform top surface for providing effective shedding of rain, snow and ice, and a uniform and continuous outside perimeter edge without interior corners and interior horizontal edges for preventing water, soot, dirt and plant materials from being captured and held within an outer boundary of the bank of panels, so that capability of cutting the blank or dummy panels at an angle across width or length of the dummy panel allows for outside edges of the bank of panels to be aligned with the corners and edges of a roof plane, thus controlling and guiding shedding of water from surfaces of the roof and increasing overall structural integrity of the solar power system. The top surfaces of the blank or dummy panels can be provided with glossy, semi-reflective surface coating that mimics reflectivity of a glass of the solar element mounted into/over the top surfaces of frames, so that texture or appearance of visible portions of the bank of solar modules and the dummy panels can be enhanced, thus enhancing architectural appearance of shingles of a home. The system ensures that surface treatments can be adapted to maintain amount of sunlight reaching photovoltaic cells below the glass of the solar modules, so that efficiency or effective range of power generation of the solar modules can be increased by deflecting, diffusing or redirecting the sunlight over a broader portion of the photovoltaic cells when an angle of incidence of the sunlight on the solar modules is less during early mornings and afternoons.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an edge treatment unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a roof-mounted solar power system.    Roof (10)    Deck (14)    Solar modules (30)    Frame structure (40)    Solar element (60)