Question 1

I bought Anker's massive 26,800 mah battery the one that comes with Qualcomm Quick charge 2.0 was wondering how long it would take to charge with this

Accepted Answer

Just a quick note: Anker has TWO PowerCore 26,800 mAh batteries in production (as of 2/2017). One includes a Qualcomm QC 3.0 compatible charging port (& 2 PowerIQ ports), but has only one micro-USB charging port for the battery pack itself (https://www.amazon.com/Anker-PowerCore-Portable-Ultra-High-Capacity-Recharges/dp/B01N3TVRP2). The other loses QC 3 (it has 3 PowerIQ ports), but gains an additional micro-USB charging port for decreasing charge time for the battery pack (https://www.amazon.com/Anker-PowerCore-Portable-Double-Speed-Recharging/dp/B01JIWQPMW). If you are looking for fastest possible charge time for a battery pack while camping, I would recommend you choose the latter model for use with any of these portable solar panels (all of which have two USB connections, as far as I've seen).

Question 2

Does this product offer any kind of rain resistance? Can it be used outdoors in a rainy day?

Accepted Answer

I left mine outside on a covered porch, up on a chair. It did get wet, not drenched soaked, and it won't work. I'm going to call the company though because I never even used it (this was my first time "charging" it and we got a freak rain come through) and I want to make sure I'm even doing it correctly and didn't just get a bad one. If I did everything correctly, I won't be purchasing another one!

Question 3

could i use both usb ports on the solar panel to maximise charging to one device? any built-in intelligence to combine both USB ports when one is used

Accepted Answer

Solar panels are rated for the best possible case of 1,000 w/m2 solar irradiance. I tested this panel in N CA using a Pyranometer to measure the actual solar irradiance over a range of conditions and electronic instrumentation to measure the solar panel's actual output wattage. In summary, even in summer over the case of a day, the solar irradiance averaged about ½ of the maximum possible and the output of the panel averaged 10.82 watts. That input to a USB battery is 2200 mAh at 4.92V. As long as the USB battery used supports this range of input, it will utilize the average potential of this solar charger.Average solar radiation for a location on the northern hemisphere with a latitude angle of 47° - 55°:sunny, clear sky summer: 600 - 1000 W/m² - Wattage rating for a panel is 1000 w/m2winter: 300 - 500 W/m²sunny, scattered clouds or partly cloudysummer: 300 - 600 W/m²winter: 150 - 300 W/m²cloudy, fogsummer: 100 - 300 W/m²winter: 50 - 150 W/m²The EasyAcc Monster 20000mAh Power Bank (4000 mAh Dual-Input specification but, I measured a max input of only 1830 + 1640 = 3470mAh using two 2.4A inputs).  It will only charge faster than a conventional battery of similar  capacity, such as Anker PowerCore 20100, using a dual wall charger capable of outputting a minimum 2.0 amps out each port or a much larger solar charger that will average 3470 mAh over 6 hours of the day needed to charge the battery. That will not happen using the Anker 21W solar panel which will average ~2200 mAh over 6 hours of summer sun. The single input port Anker batteries will closely max the average output capacity of the Anker 21W solar panel.I frequently correspond with thru-hikers who need to quickly charge battery capacity in the 20000 mAh range. Historically I have suggested a dual 2.4A wall charger in combination with 2 Anker PowerCore 10000 batteries. The measured output on the two ports is 2,600 mAh each. This combination weighs 3 oz. less than a single EasyAcc Monster and provides redundancy to protect against a battery failure. The charge rate for 20,000 mAh aggregate capacity is faster because both inputs accept 2100 mAh versus what I measured on the EasyACC Monster of 1830 and 1640 mAh.

Question 4

Could i use this to keep my phone charged when i camp out for star wars seats?

Accepted Answer

I just come  back from camping  and this solar panel works great i charge 2 cellphones and a 10 inch table and battery backup in direct sun light charge faster

ASIN	B012YUJJM8
Additional Features	Fast Charging, Lightweight Design, Short Circuit Protection, Travel, Water Resistant
Amperage	3 Amps
Best Sellers Rank	#451,570 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #258 in Cell Phone Solar Chargers
Brand	Anker
Built-In Media	Anker PowerPort Solar (21W 2-Port USB Solar Charger), 3ft Micro USB cable, welcome guide, our fan-favorite 18-month warranty and friendly customer service.
Color	White
Compatible Devices	Cellular Phones, Power Bank, Tablets
Compatible Phone Models	iPhone 7 / 6s / Plus, iPad Pro / Air 2 / mini, Galaxy S7 / S6 / Edge / Plus, Note 5 / 4, LG, Nexus, HTC and More
Connectivity Technology	USB
Connector Type	Micro USB Type B, USB Type A
Current	DC
Current Rating	2.4 Amps
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (4,052)
Global Trade Identification Number	00848061072136
Item Weight	0.92 Pounds
Manufacturer	Anker
Mfr Part Number	A2421
Model Number	AK-A2421011
Mounting Type	Wall Mount
Number of Items	1
Output Current	3 Amps
Output Voltage	5 Volts
Portable	Yes
Power Plug	No Plug
Power Source	Solar Powered
Specification Met	CE, FCC, RoHS
Total USB 2.0 Ports	2
Total Usb Ports	2
UPC	848061072136
Unit Count	1.0 Count
Voltage	5 Volts
Wattage	21 watts

Solar Panel, Anker 21W 2-Port USB Portable Solar Charger with Foldable Panel, PowerPort Solar for iPhone 11/Xs/XS Max/XR/X/8/7, iPad Pro/Air/Mini, Galaxy S9/S8/S7/S6, and More

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