A portable solar power system includes at least one prefabricated solar racking configured on a trailer frame that is transportable to a deployment site without oversize load travel restrictions (e.g., escort vehicles). The trailer frame includes one or more levelling members that permit a levelled installation of the trailer frame at the deployment site. A set of solar panels are attached to the at least one prefabricated solar racking. One or more extension members are coupled to the solar racking at the deployment site to receive and support additional sets of solar panels. The trailer frame accommodates one or more electrical and mechanical devices for harvesting solar energy, converting the solar energy to electrical energy, and/or transmitting the electrical energy to one or more loads.