We can put solar panel on the whole range of our electric passenger car. The power of the solar panel we are using includes: 115W, 150W and 170W. For 4 and 6 seater passenger car, the solar panel is built in the roof. For 8, 11 and 14 seat passenger car, the solar panel is mounted on a bracket on the top. There are two features of using solar panel. One is increase the range, based on our test, it can increase 10kms when the sunshine is good enough. The second one is that it's good for the battery as it will keep charging the batteries with small current.