Ответ:Per the manufacturer: Thank you for your purchase and question. You can use the cigarette lighter to connect to the battery but it is best to connect directly to the battery. The solar panel does best when it is in full direct sunlight because most windows have UV protection which reduces the efficiency of the solar panel. Most cigarette lighters only work when the key is turned on. There is added resistance between the lighter plug and the battery to reduce efficiency. The SolarPulse will work for you using the lighter plug but it will not be as effective as connecting directly to the battery.