How long does it take to charge a Bivy Stick with the solar panel? Melanie August 16, 2022 18:41 Updated It takes approximately 2-3 hours to charge under ideal conditions. **For the best results, place the solar panel at a 45-degree angle in sunlight. Cloudy days may not generate sufficient current to charge. Related articles Are there any countries where it is illegal to take a Bivy Stick? Can the Bivy Stick be used on multiple phones? Preserving the battery life on your Bivy Stick What is the size of the battery? How does the SOS work? Comments 0 comments Please sign in to leave a comment.