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The objective of this article is to provide a comprehensive investigation of the opportunities and applications of using solar panels in electrified vehicles. The use of photovoltaic (PV) panels as an auxiliary energy source of on-board fuel in plug-in hybrid electric vehicles (PHEVs), full hybrid electric vehicles (FHEVs), and battery electric vehicles (BEVs) is investigated. The electrical architectures and the benefits of various possible applications are presented, such as active vehicle cabin ventilation, charging the low voltage battery, and charging the high voltage (HV) traction battery to extended driving ranges. In addition, the possibility of using PV panels to cool down the HV battery in extreme temperature environments is also investigated, supported by experimental tests used to properly model the thermal behavior of the HV battery and the effect of the cooling.