So charming, the idea is to load his phone with solar power - so little has been working and I've tried so some putative solar charger that never work properly.
A detailed research showed then that powerful solar cells possible (from about 17% efficiency, for example, mono-crystalline) and a minimum of 7 watts, better would be more - there are only including children's toys.
In addition, I wanted to a charge control, so the devices can be connected directly to the panel - which includes the whole before from 20 Euro-devices who like to stop charging and not restart.
In the 30 Euro class there are 2 main types then: With 2 or 3 panels. The 3-fold solution is more compact and thus more portable - a clear advantage, even if the device slightly heavier then (here 451 grams).
Now actually only 3 units remained and RAVPower had with 9 Watt the highest performance - a good option because:
already at the first test (in March 2015) in teilbedecktem sky, behind a disc loaded the part my Samsung S3NEO with an average of 550mA - sensational !!!
Are there any disadvantages?
Yes - the part is already on the verge of real mobility - it should not centimeters taller and
be no grams heavier.
In addition, the panels are not flexible but rigid - but the padding makes a safe impression. The scope of supply is also a bit limited: there are no USB cable here - but for ALU-carabiner for practical eyelets.
CONCLUSION:
Who wants to have a reasonably be loaded Solar part in our latitudes, needs tidy performance and charging electronics. Both offer the RAV-power for just over 30 euros. A fair price, because individual solar panels of this quality are not much cheaper and there will be invisible mobility.
Update 1:
Recommended Accessories - USB multimeter ammeter - at EBay bought for 1.70. The measured values are 4.8 to 5.2 Volt: Very good.
The maximum current is 0.95 A far - of course that is still below the theoretical maximum performance but I am happy - my Samsung S3neo is with a charge current of max. 800 mA and loaded in the middle with about 450 mA - which corresponds approximately to the actual performance of 800-1000 mA power supply.
I have now tried 2 extra batteries - both are reliably charged, even though the Pearl-part is relatively sensitive to low flows.
The other part appeared to the charger with the time to discharge itself (although yes, however a diode protection to be installed) - to the voltmeter I could not watch.
One final plea to the people who are always "not helpful" press: I am writing these reviews only to help others and give me trouble with it - if you do not like something, I would be grateful for constructive criticism.
