How long using only the sun does this take to fully charge?

The capacity of the power bank is 20000mAh. The Max Solar Charging Current is 300mA (from product description here). So, under ideal condition, it takes at least (20000mAh/3000mA = 66.7hrs) 66.7hrs. If you have 8hrs full sun per day, it will take (66.7hrs/8hrs = 8.3days) more than 8 days. It matches the answer (10 days) by Hien on June 3, 2019.

Can this charge through both solar and usb at the same time?

The only problem here, is the max charge current, is 250 or so MA (milliamps = 0.001 ampere) it's going to take a very very very very long time for the battery to charge to a usable point, but it might be useful in recharging the battery ad you use it outside or under direct light, that offers some uv radiation.. also, people 5hink alot of hot sun is what you need for solar, but modules overheat like anything else and when they do, that small little number(250 MA or so) well that's 5he max efficiency and that'll plummet to 0 if they get too hot.. proly don't wanna leave it in direct sunlight for 3 weeks.. especially if it's hot out. A window maybe inside with the air conditioning, on your dash while driving. Or even outside if it's a cool sunny day. It should work best in those conditions. X) hope that helps

does Qi charge through phone cases?

I usually get pretty hefty cases, and 90% of wireless charging stands I tried would not charge my phone unless I took the case off. I can't imagine this unit being much stronger if at all than plug in charging stands

Does this have pass-through (charge and being charged simultaneously)?

Do not believe so. The wireless charging pad is opposite side of solar panels. You also have to turn it to charger phone mode (constant on light) OR charging mode (blinking lights). As my only and first solar charger I still feel it does its job and does it well.

Batteries	1 Lithium Polymer batteries required. (included)
Item model number	PN-W12
Is Discontinued By Manufacturer	No
Color Name	オレンジ
Compatible Devices	スマートフォン, タブレット
Connector	USB Type C
Battery type	Lithium
Compatible Phone Models	Ipad,Iphone
Operating System	Android, iOS
Voltage	5 Volts
Wattage	7.5 W

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