The SP10R is a 10-W photovoltaic power source capable of recharging batteries. It has an on-board voltage regulator. The user-defined-length cable has stripped and tinned leads that connect directly to a user-supplied deep-cycle battery. The SP10R is a sufficient charging source for many of our system configurations in tropical to temperate latitudes. It allows unattended operation of systems in remote locations, far from AC electrical sources.