I have developed an unnatural obsession with powerbanks, I have a large number of them for different purposes.
I decided to start reviewing them to give people information before making a purchase, often these cheap devices are sold with a number of features which may or may not be useful of even work at all.
So ill start off by listing the locations where you can purchase them, and the costs.
So for this experiment ran two tests, one with the unit on its own and another with an external USB Solar panel attached to assist in the charging.
Here are the links and costs to the products.
- Powerbank 50000mha dual usb with LED – $24.99
- Solar Panel 6volt 3.5watt – $7.38
01. The first test was conducted in the following way. I put the powerbank in the sun during an overcast day for six hours facing North (10am-4pm). Then I connected it to my phone can checked to see how much charge was given.
Conclusion. The charge isn’t that much, but its enough to get you out of a sticky situation.
02. The second test was conducted in the same way as test one, but also installing the Solar panel listed above.
Conclusion: I’m impressed, 40% is decent charge levels for 6hours in the sun.
Im pleased with this product. I have tested it in the rain, I can confirm its was resistant. Its a tough product, it needs to be if its going to survive in my world.
Iv like to test and know how much uptime can be achieved by different powerbank.
I purchased this powerbank case on ebay and then purchased the 18650 3.7v batteries separately.
I have built two powerbank with identical cases but different batteries.
- Batteries 18650 9600mha – 23 Hours
- Batteries 18650 6000mha – 18 Hours
It should also be noted that the Raspberry Pi is online via wifi during the whole test while getting pinged every minute.
Raspberry Pi Power Experiment 2
Going on from my first experiment, this one will be slightly different.
I will be using a 12v to 5v USB converter and a 12v AA battery caddy. This caddy stores 8 x AA 1.5v rechargeable batteries. This design will closely simulate my end design which will include a charge controller and a 60w Solar panel.
I did not commit to this design by soldering the wiring and connecting permanently as its a quick dry run test. I simply want to test the duration in which it will power a raspberry pi with a wifi dongle.
Unfortunetly the results sucked! Taking into account that the batteries are not new, the raspberry pi ran for 4 hours and 37 minutes.
This is a poor a result and is sending me back to the drawing board in regards to my design. I need to think about getting a sealed lead acid battery with some decent capacity.