BigBlue New 5V 28W Solar Charger with Digital Ammeter Dual USB Port Foldable Solar Charger with Waterproof Sunpower Solar Panels for Cell Phone, iPhone, Backpack and Outdoor Camping
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- Built-in Ammeter and Chip: the solar charger has a digital ammeter that shows the amount of Amps present and an internal chip that assure stable charge
- Wide Compatibility: Attached a micro USB cable for almost all the Android devices and some of the DSLRs. You will need an extra cable for other devices
- Safe Charge: SunPower Solar Panels with high solar conversion efficiency is great for any outdoor activities such as camping, climbing, fishing etc
- Special PET Polymer Surface: Protect your solar panel and your devices from occasional rain or wet fog -- ipx-4 waterproof level, but keep it away from water when you have some devices on charge
- Package & Warranty: BigBlue package, Industrial-strength PET polymer fabric, 24-month warranty and friendly customer service
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The Perfect Companion for Adventures
The BigBlue Solar Energy Charger.
Lightweight, easy to carry. When folded it has the same size and thickness as a magazine.
Designed specifically for all those people wit passion for trekking, camping, hiking, picnics, fishing, boat, etc.
Compatible with all USB rechargeable devices, with only sun energy. 100% Green Power and 21.5-23.5% Solar Efficiency.
Place the charger wherever you can access the direct sunlight and relax, admiring the panorama as you charge your cell phone, tablet, GoPro, camera.
Built-in Ammeter and Pocket with Zip
The package includes 4 hooks, allowing you to hook your solar panel everywhere (trees, backpacks, curtains, etc.)
Waterproof and Internal Chip: Every time he loses contact with sunlight for a short period of time (dense forest, clouds, temporal passenger) will stop charging until he comes back into contact with the sunrays, without damaging your connected device.
Built-in Ammeter and Pocket with Zip, keep your devices safe and clean.
Please remember that Apple devices has an inner chip that stop the charge of the phone whenever its inner temperature get too hot.
To prevent this kind of situations while charging the phone under the sun, we suggest to use a longer cable and keep the phone in a shadow area.
Please use this solar charger in full sunlight without any shades or obstacles.
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I have tested 5 of these folding solar chargers now. This one is is just as good or better than others. I tested the 28 watt (4 Fold) version which is capable of charging up to 3 devices. This one has a rubber weather protector over the USB ports to help protect from water and dust. I also like the soft tie downs on this charger. Many of the others on the market use metal rivet holes. The flexible strap points on this one will give a little bit more flexibility in attaching this panel to a tent, tree, backpack, etc...
Unlike other 28 watt solar chargers that I have tested, this one has only 3 USB ports. Believe it or not, this is actually a good thing. While you probably could charge 4 full sized smart phones in the middle of the day with the sun directly overhead, in the morning or evening, you are going to be asking way too much of the charger trying to power 4 devices. You may get some erratic behavior and put a lot of stress on the charging circuits of your devices. 3 Ports is just right for a 28watt solar charger
I tested this thing outside in the late afternoon sun on a fall day (4:30PM on 9/28/16 to be exact). Even being late in the day I was able to get 3.1 Amps reliably out of it. Had I tested it in the middle of the day, I'm sure I could have gotten up to 3.5 amps. I used a constant current load resistor set at 2.5 amps at first. The charger had no trouble powering it. I had to go beyond the 2.5amp limit of my load resistor so I brought out a power hungry bluetooth speaker which is always good for drawing about an amp. I had to dial down the load resistor to 2.1 amps. The speaker plus the load resistor together drew 3.14 amps. Voltage on the 1amp port did not drop below 4.75. Voltage on the heavy draw, 2.1amp port dropped down to +/- 4.5 volts. (As you can see on camera I kept having to adjust the amperage down because the sun was lowering on the horizon).
This solar charger works well and would be a great choice for anyone looking to buy a solar charger. Just decide how many devices you want to be able to charge. If you want to be able to charge 3 devices, get the 28 watt charger, If you only want to charge 2, the 21 watt will be more than adequate.
Using dummy loads, 1 port (labeled 2.4A):
2.39A @ 5.14V = 12.33W
3A @ 5.03V = 15.09 W
4.36A @ 3.60V = 16.70W
Using dummy loads, 2 ports (labeled 2.4A)
1.98A @ 3.4V + 2A @ 3.13V = 13W
2.39A @ 4.89V + 1A @ 5.21V = 16.90W
Using battery banks ("real world usage")
Battery bank "A" (wall charges at ~9.7W): 1.87A @ 4.87V = 9.11W
Battery bank "B" (wall charges at ~7.77W): 1.22A @ 4.95V = 6.04W
Bank "A" and "B" at the same time (2 ports):
"A": 2.05A @ 4.60V = 9.43W
"B": 1.01A @ 4.90V = 4.95W
Just for fun, I added the dummy load on the 1A port while both battery banks were charging, and I was able to get another 0.56A @ 5.10V = 2.86W. This brings the total to 17.24W while all 3 ports are in use, and is probably absolute max you can get.
In the pic you can see that the once square box is deformed and even the nylon pattern got imprinted on the surface.