If I didn’t already have a pair of Aduro solar chargers I’d jump on this. The ones I have work quite well, and it has been over a year I’ve used each of them, and there is at yet no change in performance.
How long do they have to be in the Sun for them to recharge?
If my math is right, about 21 hours of peak sunlight not including conversion losses if it’s using the most efficient solar cells available outside of labs (the ones used in 400 watt standard sized rooftop panels). Depending on where you are in the country, I would estimate that if you left it sitting outdoors under the sun, a full charge from empty would probably take at least a week with no use in between. But it’s likely these are using much cheaper solar cells so more realistically if you left it in a window indoors exposed to the sun and oriented well, it’d probably take 2-3 weeks to charge fully from empty on just solar.
But if it were outside and unobstructed and you dutifully kept it aimed directly at the sun, you should be able to go from empty to full in 3-5 days during the summer.
In practice, a solar panel on a battery pack this physical size is probably more of a “keep it topped off while not using it” kind of thing. For actual daily use, you’re best off getting one of the folding ones used more for camping and outdoors backpacking type stuff.
My math might be a bit off, but I think it’s not far off. Solar panels this size just don’t make that much power and they’re rarely using anything close to the most efficient solar cells in products like these.
So until someone with more official measurements chimes in, this should get you into the ballpark.
Also bear in mind that a 10,000 Ah battery should charge most phones 2-3 times or a little more.
Good guesstimating… some things to ask would be: what range of wavelength(s) do the solar cells prefer? That’s the color to paint a reflector box, to bounce as much of “the good stuff” to the conversion surface as possible. Or various sheet or foil metals may be efficient reflectors… But yeah, you’re not going to get enough charge to drain a battery every night and be able to top it off every day. You’ll stay ahead of the curve for awhile…
Something wrong somewhere, as the one I’ve been using takes 1-1/2 to 3 days sitting in either my living room window, or more commonly the back window of my truck. This is also in Chicago, which does not have super sunny days many times. In the past it seemed like we would lose power just when I needed to charge my phone. Now I keep this in a sunny spot and if the power goes I know I can get a couple full phone charges out of it.
I would love to buy it but I don’t want the app. I won’t be bribed to buy the product.
I didn’t see where there is an app you have to buy. Most of the Aduro electronics don’t have apps. I agree, many/most things seem to be trying to insert sneaky apps into my stuff, so they get skipped. Smart response.
I’m pretty sure they mean the woot app - this is an app-only deal.
Got one of these and it’s not great. The battery seems good, and can charge via power cord, but the solar recharging is poor. Even in direct sunlight on a clear sunny day in the south, the solar indicator is only at 1 light, and I’m not sure it’s even recharging at all.
Grabbed two of these. The solar charging doesn’t even almost work. One has been in the direct sun for 3 days, and the other for 1 day. Neither has charged at all. Is this most recent batch defective or are they generally just this awful?
This is a great deal for a solar charger for your phone. It’s not that great a deal for the paperweight that this basically is though. After getting a minimal charge to my phone from a fully charged battery on the backup it essentially died out and is useless. It doesn’t seem to be recharging in the sun and when I connect my phone to it the phone doesn’t even register that’s it’s being charged or anything. Also, no directions or manual seem to be available anywhere for this unit. I’m unsure why the green light is constantly on also, seems that it’s just draining the power down needlessly.
I too have a nice normal portable battery with a flashlight, but the solar cells only power the little green “solar charging” light and nothing else. I live in a very sunny area and after leaving this unit in the sun for 9 hours I did not even get single dot of charge. The good news is, it survived a full work shift in direct sunlight on my windshield and did not burst and catch on fire. 
This only works as a flashlight. It does not charge my iPhone 12 at all. Very disappointed.
Hi there. Remember that you have a warranty with Aduro:
Warranty: 1yr Aduro Limited Warranty