I have a good piece but then gained me the beginning of August. Due to the bad review I have to set the power POND USB power meter with integrated ampere meter, voltage monitoring, voltage meter gained ... me.
Now for my test results +.
I have the beginning of August 12: 00Hour (when the sun is highest) my solar panel optimally aligned (with the help of 2 triangles and their shadows).
I connected a USB BATTERY 15000mAh was loaded with 5 volts and 1.5 ampere (more charge current makes the battery away from home not with).
Then I have a second USB battery is connected. The measurement showed that both batteries with 5 volts and 1 ampere load (10 watts).
Also, I was able to determine that the charging current also depends on the battery charge status (an almost full charging is as fast). The cables used to play a role.
I think this is a very good result, but I have not tested it in sunny June. Furthermore, is a manufacturer always the maximum power of which is anyway never be reached in Germany. For this coming every 1000m of altitude, the radiation power of the sun again increases by 20 per cent and I tested on about 100 meters.
Conclusion:
With the panel it is easy possible to load his smartphone or even two in real time.
Due to the area of the 4 modules, the anchor can provide power in overcast weather still.
You can anchor appreciate only when one several days has no outlet within reach.
It was worth it for me and I would buy it again.
