NOVELTY - The system (101) has a golf car (131) made available for use at a golf course. A photovoltaic cell (109) is fixed with the golf car. A controller system (501) comprises a power management device electrically coupled to the photovoltaic cell. A processor is coupled to a non-transitory memory and stored information about power required for the golf car to operate for a duration of a round of golf at the golf course. A motor (129) drives the golf car. The controller system compares present power use to the information about the power required for the golf car and regulates the motor.    USE - Photovoltaic power system for managing and using solar power for electric golf cars for a golfer at a golf course.    ADVANTAGE - The system compares power use to anticipated need and regulates power use, so that an anticipated need is satisfied by the available power, thus ensuring ample power for a user to complete an activity such as playing a round of golf. The golf course retrofits fleet of carts through use of a solar roof apparatus to minimize energy costs and selling power back to an utility commission without purchasing an entire fleet, thus saving energy bills, retaining and growing a base of satisfied customers and providing long-term improvements to a bottom line for the golf course, and hence providing the data to the owners of the golf carts to know about energy savings provided by a solar array, operations potentially damaging to a battery usage in relation to required servicing and operational information that fine tunes and improving an operation of the cart in future.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for managing power for a golf car    (2) a power management system    (3) a solar apparatus for a golf car.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a golf car power system.    Golf car power system (101)    Photovoltaic cell (109)    Motor (129)    Golf car (131)    Controller system (501)