The Solara DCsolar OBD2 battery charger makes it particularly easy to keep the starter battery happy. Attach the module to the windscreen, plug the cable into the OBD connector (easily accessible at the bottom of the dashboard) – and you’re done. At the heart of the concept: a flat module measuring 35 x 25 centimetres and weighing just 590 grams with an output of 13 Wp – sufficient power and is installed on or behind the windscreen using suction cups. It can be connected to the standardised OBD 2 port in the vehicle without any specialist knowledge. The integrated charge controller prevents the battery from overcharging. The monocrystalline high-tech solar cells generate solar power even in low light. Price: from 79.90 euros.