Follow How long does it take to fully charge the solar charger by sunlight? June 15, 2021 17:16 Xtorm by A-solar | Support Frequently Asked Questions That depends on any number of factors: Size of the solar panel of the A-solar device Size of the internal battery of the A-solar device The lighting conditions (see optimum conditions) 2 Comments Date Votes Nico Arends January 04, 2017 15:04 I am investigating how long the charge will take under different conditions. I will report the results here. prinssens June 15, 2021 17:16 Hi Nico, I guess we can safely say that after 4 years the solar powerpack still isn’t charged? Please sign in to leave a comment.