Solar　photovoltaic　cells　will　be　an　effective　supplement　to　electric　vehicle　batteries.　In　order　to　make　the　photovoltaic　system　of　the　solar　car　provide　reliable　power,　this　paper　models　the　photovoltaic　cell　and　designs　the　maximum　power　point　(MPP)　tracking　algorithm　based　on　three-point　sampling　with　a　fixed　voltage.　In　addition,　considering　that　the　output　power　will　change　when　the　voltage　and　radiation　intensity　change　under　the　peak　power　of　the　solar　vehicle,　the　prediction　of　the　peak　output　power　of　the　photovoltaic　array　considering　the　influence　of　the　radiation　intensity　and　battery　voltage　is　put　forward　for　the　first　time.　Experiments　show　that　the　designed　power　algorithm　runs　stably,　and　the　power　generation　power　prediction　error　is　less　than　1%.　The　peak　output　power　prediction　of　the　photovoltaic　array　takes　into　account　the　effects　of　real-time　radiation　intensity　and　battery　voltage　fluctuations,　making　the　peak　power　prediction　of　the　vehicle　more　accurate.