Provided are easy-to-install rooftop photovoltaic systems. One rooftop photovoltaic system includes a roofing material piece, a photovoltaic module disposed on the roofing material piece and an inverter configured to convert DC from the photovoltaic module into AC. Another rooftop photovoltaic system includes at least one active unit including one or more photovoltaic modules each including photovoltaic cells shaped as shingles to provide a roofing material appearance; and one or more inactive units having the roofing material appearance.