NOVELTY - A solar panel condenser apparatus comprises an optical condenser (302) containing first Fresnel lens; and first photovoltaic cell (303) mounted parallel to the optical condenser and placed about midway between the optical condenser and the focal point of the optical condenser such that most of the light received by the optical condenser falls on the first photovoltaic cell. The apparatus further comprises second photovoltaic cell; third photovoltaic cell; faceted funnel concentrator; and spherical light trap.    USE - As a solar panel condenser apparatus (claimed) in solar cells used as semiconductor device for converting incident photons from the sun (solar radiation) into useable electrical power; in the field of photovoltaics; and as apparatus for increasing the power output of photovoltaic cells.    ADVANTAGE - The apparatus improves the output of photovoltaic cells in a cost and space efficient manner. The apparatus allows collection of solar energy. The beam splitter optical element separates the solar spectrum into multiple regions that are within the optimal bandwidth of each respective solar cell. The apparatus allows separation of the solar spectrum into bands such that each band is directed to a separate solar cell optimized for that portion of the spectrum. This enables inexpensive solar cell technology to be implemented without requiring expensive multi-layer solar cell technology. The amount of semiconductor material required is reduced. The solar condenser increases the electrical power output of a conventional solar cell configuration using a concentrator lens that is larger in diameter than the solar cell. The hybrid solar condenser further increases the electrical power output of the funnel concentrator over the lens-only concentrator by increasing the combined concentrator solid angle which concentrates a larger fraction of the sky background onto each solar cell.    DETAILED DESCRIPTION - A solar panel condenser apparatus comprises an optical condenser (302) containing first Fresnel lens; and first photovoltaic cell (303) mounted parallel to the optical condenser and placed about midway between the optical condenser and the focal point of the optical condenser such that most of the light received by the optical condenser falls on the first photovoltaic cell. The apparatus further comprises second photovoltaic cell; third photovoltaic cell; faceted funnel concentrator; and spherical light trap. The optical condenser comprises second Fresnel lens. The condenser further comprises collimator lens or solid immersion lens. An INDEPENDENT CLAIM is included for multi-band solar cell stack comprising: a first solar cell fabricated of a material optimized for first portion of solar spectrum and directly exposed to sunlight; and second solar cell fabricated of a material optimized for second portion of the solar spectrum, where the first solar cell and the second solar cell are stacked, and the first solar cell is of thickness such that the portion of the second portion of the solar spectrum passes through the first solar cell to the second solar cell. The stack further comprises third solar cell fabricated of a material optimized for a third portion of the solar spectrum; and fourth solar cell fabricated of a material optimized for a fourth portion of the solar spectrum.    DESCRIPTION OF DRAWING(S) - The figure shows rear view of solar panel condenser apparatus.    Optical condenser (302)    Photovoltaic cell (303)    Cooling system (304)