A solar collector assembly includes a photovoltaic panel having first and second sides, a frame, and a first gas-filled chamber on the first side of the photovoltaic panel. The first gas-filled chamber is at least partially defined by a portion of the frame and by a portion of the first side of the photovoltaic panel. A gas functions as a heat exchange fluid and collects heat from solar energy and/or heat generated by the photovoltaic panel. The photovoltaic panel accumulates and converts solar energy to electrical energy. The solar collector assembly may include a second gas-filled chamber provided on the second side of the photovoltaic panel. The second gas-filled chamber is at least partially defined by a portion of the frame and by a portion of the second side of the photovoltaic panel. Solar collector systems and methods of generating electrical energy and/or thermal energy are also described.