< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > I have taken part in a competition about solar car racing recently. The car I am going to make is just as big as a toy car. I have some problems about it's power source. I am going to use converging lens to concentrate sunlight to my power cell and I have think of two ways to do it: First, I will use one converging lens place on top of my power cell Two, instead of using one, i will use about five of them to place around the power cell to get as many sunlight as possible. I want to know which one is better and their output current (DC) so I can buy a proper engine.