The Solar-Powered Exploration Rover (SOLERO) is designed for exploration on Mars. The most prominent feature of SOLERO is its ability to operate relying on just-generated solar power, i.e. with minimal use of batteries (only for contingency or peak power demands). On Earth there are a number of solar-powered vehicles operating in this mode. However as Mars is further from the sun than Earth, the power available from sunlight is significantly reduced and thus to design a working and reliable system is much more difficult.