... , Mp3, Mp4 3, USB 4, outdoor thin film solar panel1, portable solar film panel2, apply for mobile phone, laptop, PC, camera ... 12V lithium battery ( Figure 3)4, solar power voltage controller ( Figure 4)5, 12V car power outlet ( Figure 5)6, battery ... weather, seasons, equipment and other factors TroubleshootingI, check the solar power panel and device connection. See operation schematic diagramJ, check ...