How many hours of direct sunlight does a Solar Panel need for my device to stay charged? For best performance, recommends at least 4-7 hours of direct sunlight per day for Solar Panel. With the recommended amount of direct sunlight, the device will remain continuously charged under most conditions. Make sure there are no obstructions or objects that could cast a shadow on your solar panel, such as an extended roof, tree, or bush. Will solar power keep my device charged during cloudy or seasonal weather? solar products require direct sunlight to stay charged and provide power to the device. If the weather is cloudy or it rains/snows, this would limit the direct sunlight your device receives, which would lessen the charge. Colder temperatures may also cause excessive drain to your device's lithium-ion battery. With prolonged cloudy or winter weather, you may need to manually recharge the battery more frequently. When sunny weather returns and the solar panel receives enough direct sunlight again, it will keep the device powered. How can I install my solar panel to get the most sunlight and the maximum solar charge? Seasonality and how far north or south you live affects the strength of the sun. If you live in the northern hemisphere, install your solar panel facing South. If you live in the southern hemisphere, install it facing North. recommends to use the adjustable arm to angle the panel at about 45 degrees toward the sky to get the most sunlight possible. Will a solar panel keep my device fully charged at battery level? The battery level of the device will vary based on the amount of direct sunlight the solar panel receives. Even with exposure to maximum sunlight, the battery level will not exceed a threshold of around 80%—this is to extend the lifetime of the battery.