I decided to charge some of my Li-Ion-batteries with a solar panel. With 50Wh maximum capacity and a super idealistic charging time of 2h a panel of 20W is the absolute minimum. During winter only 10% of this power is left, thus 2W of charging power in average (less hours of sunshine and lower angle). It'll need >2 days to charge the battery. But for a first test run it is sufficient. The specs summed up: More…

Sometimes there a small problems asking for a large scale solution. There is a variety of night lights: with motion sensor, with a bear print, with a timer switch and controllable by smartphone. As a network and media engineer I long for my personal one. Not yet translated. More…