Your SONNENGLAS® might not have received enough sunlight or energy via the Micro-USB cable. Assume it has, please make sure that the flat round metal button on the metal handle is positioned correctly, i.e. on the grey dot on top of the solar module. Only when the circuit is closed, your SONNENGLAS® can light up. In case it still does not want to shine, we recommend to provide your SONNENGLAS® with a very intense charge in order to “kick-start” the battery. This simple measure referred to as “calibration” has already brought many SONNENGLAS® lamps back to life… and here is how you proceed: charge your SONNENGLAS® intensively – for at least 5-6 hours – over the Micro-USB cable. It is as simple as that!
In case you have an older version of SONNENGLAS® without a Micro-USB port, you have the option to calibrate your SONNENGLAS® with natural light. Please note that a full charge via direct sunlight takes about 2-3 days in summer, in winter about 7 days. This certainly depends on where you are geographically located, respectively on how much sun you enjoy in your region.
Do not switch or leave your SONNENGLAS® on while you are charging it. Put your SONNENGLAS® - or just the unscrewed lid - at an angle that makes the sun directly shining onto it. Like this you allow a maximum of energy absorption.
Even after the calibration is your SONNENGLAS® still too dark or not shining for long enough? We will be more than happy to assist you with that! Please contact our Customer Service team under [email protected]
and provide your serial number from the white sticker on the bottom of the solar module. We will handle your issue A.S.A.P.