World’s first off-road solar car ‘Stella Terra’ succeeds in cruising from Morocco to the Sahara

This is a feat regardless of the answer, but I’ve read a few articles and none have mentioned anything regarding battery capacity or an explicit rate of charge. It’s just range estimates all the way down. Are there any figures on its charge rate via solar or its battery capacity? The difference between a solar car and a car that can use solar energy is vast.