NOVELTY - The system has a photovoltaic solar panel (1) secured to the roof of a vehicle by an adhesive. A charge controller (4) is electrically connected to the solar panel, a primary electrical load (7) e.g. air handling unit, and a battery (5) for automatically detecting solar panel power generation, electrical load power consumption and battery charge. The controller selectively routes power between the solar panel, the electrical load, and the battery based on the detected power generation, power consumption and battery charge.    USE - Solar power system for mounting to roof of a vehicle i.e. emergency trailer (all claimed), used by emergency response agencies.    ADVANTAGE - The system provides optimal power usage from the panels while regulating the amount of charge to the batteries and air handling unit. The panel is adhered directly to the roof without penetrations or perforations that are approved by state revenue departments for tax incentives and rebates. The system utilizes direct current disconnects (DCD) to provide an extra layer of safety and to facilitate an efficient interconnection for generating electricity from the solar panels. The DCDs disconnect the panels for any necessary service without risk of getting an electric shock, thus enabling an emergency trailer operator to safely reach the controls for the DCDs if service needs to be performed to the batteries. The controller has pulse width modulation series battery charging characteristics, 3-position battery select, very accurate control and measurement jumper to eliminate telecom noise. The controller automatically recovers a protective action such as short-circuit condition protection, overload condition protection, overtemperature protection and surge protection.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for operating a vehicle-mounted solar power system.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram of a solar power system.    Photovoltaic solar panel (1)    Direct current disconnect (3)    Charge controller (4)    Battery (5)    Primary electrical load (7)