Anyone who is out and about a lot knows the problem: the cell phone battery runs out precisely when when there is no power outlet to be found far and wide. Solar chargers can be a savior in an emergency – at least if the sun is playing along. The offer is large: We have two solar chargers and a solar backpack for you and tested two solar power banks.
The PowerPort from Anker costs around 60 euros and is roughly the size when folded up a sheet of paper. At half a kilo, it is not really heavy either – perfect for on the go. It has a total of three solar cells and a small side pocket. There are two USB ports and space for the mobile phone so that it does not come with Charging has to be in the blazing sun. According to the manufacturer, the solar panel should be up to 21 watts under optimal weather conditions Generate performance. We put the thing on the roof terrace for about 5 hours on a sunny day and came to a maximum of 10 watts. We managed to fully charge an empty Huawei P8 Lite in around 3 hours. Our other charger, the 16-watt RAVPower, is 10 euros cheaper, the cell phone brings in the same time, however, only to about 90 percent. According to the manufacturers, both solar chargers are weather-resistant.
Nevertheless, the parts shouldn't get a lot of rain, especially since the performance already drops enormously in small clouds. This is a solar backpack from SunnyBAG: a complete combination of backpack and solar panel. It is comfortable to wear thanks to the padded shoulder straps and even has a laptop bag. On the front there is a removable solar panel with a maximum of 6 watts. However, that doesn't do so well: the Huawei P8 Lite has it after three hours Made it to only about 70 percent – and there the solar panel lay motionless in the sun.
The performance also decreases enormously depending on the movement and orientation. On the back and in the shade, the panel only generates around 0.3 watts! The Revolt brand solar power banks with 20,000 and 11,000 mAH are disappointing. We both lay in the blazing sun for a whole day and they were in the evening just 10 percent charged. The problem with solar power banks is simply the size of the solar cell. It is simply too small to recharge the battery in a reasonable period of time. So if you want to charge your cell phone on the go, the best thing to do is to go to one grab the fold-out panel or, best of all, charge the power bank in advance at home..