Board Thread:General Discussion/@comment-167.206.233.170-20130605125339/@comment-10766793-20130616232616

In the page says this:

"The Solar Engine will store solar energy to power the cart even when there is no light to be gathered. This means it can be used at night or in dark areas for limited periods of time."

I think that this deserves my "stupid" question.

And giving a second thought, it can work underground, if it has before gathered energy from the sun.