When the sun is not abundant, it doesn't make a difference in power, as the batteries are the power source, merely needing to be charged correctly. The solar panel is the charger. On this cart, there is an alternate charging source, however the importance of the entire system is the efficiency. In a current electric cart, the travel range would be based on one charge. The difference in a solar cart is charging from the sun, on the move. The other range difference is the electrical upgrade of the system. There is electric cart technology leaps and bounds ahead of what you get through Club Car right now. This carts range has been, so far, 20-30 miles with the potential to be more. If you would like more information/education you can email to email@example.com.