A lighting system has a power source formed by a solar panel and a battery assembly, a lighting assembly having a plurality of lighting devices arranged into a plurality of lighting groups, the light assembly having a predetermined maximum power, and a multiple-input power converter electrically coupled to the power source and the lighting assembly for powering the lighting assembly using the power source, and for charging the battery assembly using the solar panel. The multiple-input power converter is configured for calculating a power upper-bound based on the level of stored energy in the battery assembly and the length of a night time, and selecting at least a subset of the lighting groups and powering the selected lighting groups for illumination using the battery assembly for preventing exhausting the stored energy of the battery assembly before the battery assembly can be charged by the solar panel.