Compared to conventional solar panels, the SUNPOWER cells used by SUNNYBAG have a significantly higher efficiency - that is 22.4%. To guarantee this high quality we check the performance of every single panel before shipping it. The test certificate is enclosed with your SUNNYBAG and shows you the maximum power point and the exact test day and time. That way you can be sure that your SUNNYBAG lives up to its promise to reliably charge your devices with renewable energy.
Optional power bank
Our power banks were specifically designed for charging with solar energy. They are the perfect intermediate storage for the clean energy of the sun. Two out of our three models are equipped with optimized power management (OPF technology) which enables simultaneous recharging and discharging. That means that you can install a SUNNYBAG power bank in between a solar panel and your smartphone.
The power bank stores the varying solar energy efficiently and steadily delivers it to your smartphone. This is the most efficient way to use your SUNNYBAG.