I have a mobile robot with 600 W (rated power) and I need to implement a PV system on the robot to be completely solar-powered. I want to reduce the size of panels and get the required power.
Hi Essam, perhaps the best for your application would be the "CIGS" thin film solar cell. They are not quite as efficient as the silicon wafer type, but they can be made to fit (a substrate material), rather than having to accommodate the somewhat rigid silicon cells and can even be flexible. They are mechanically more robust, but do contain toxic materials. The silicon cells by comparison are however very cheap, efficient, non-toxic, and easily available. So if it is for low-cost small scale use then silicon cells are very hard to beat.