Solar-Power-Bank-Portable-Charger-42800mAh Solar Phone Charger with 4 USB Ports/LED Flashlight Fast Charge USB C External Backup Battery Pack Compatible with iPhone Tablet, for Outdoor, Camping

While I have not had the need to try and charge these with the built in solar panel, they very nice power banks. While I have purchased four of these, one if them was stolen, so I only have three. They get a lot of use and work well. My only disappointment is that take about 8 hours to charge using a usb-c cable and a PD charging port.

Good charger. It works perfect as a charger for my phone and I’ve used it to power some USB lights. While it is a a bit heavy, I’d suggest getting a long cord so it’s not in your way. It’s built well, but the flashlight seems a bit over engineered. I guess it could be handy camping. Overall good value and glad I got it.

Though the product info claims "Fast Charging", it did not support any "Fast Charging", "Quick Charging" (QC) or "Power Delivery" (PD) protocol at all. It only provides a steady 2A-5V 10W output on any port!I tested it using a "Kowsi KWS-066C Digital " USB Power Multimeter and a 100W rated USB-C PD cable to recharge various devices like QC cellphones and PD Chromebooks.I returned it because I couldn't use it for even single port fast charging of a cellphone.Details:The ports could only consistently provide 2A-5V 10W output! Even when only one port is being used, after the first second of 3A-5V 15W output the ports switch to the lower 2A-5V 10W output. The total for all 3 simultaneously charging ports is 30W but no single port consistently gives more than 10W.Though it did eventually recharge the QC phone, it took 3x longer than a functional "Fast Charge" should have taken and I didn't want to carry around both of these devices connected together for that much time. And of course this means it could not recharge a Chromebook which requires at least 15W minimum to recharge while it is powered off.The Solar Charging is almost a gimmick. Leaving the power pack exposed to bright sunlight recharging for long periods of time makes the unit so hot from the sun that it's internal batteries overheat and throttle down the already small solar input wattage. If you are camping off-the-grid, you are better off using separate portable solar panels to recharge it.Since I was returning it anyway, I didn't bother to verify its 143.56Wh capacity with the USB Power Multimeter (the industry standard conversion formula for this power pack is "143.56Wh = 38,800mAh x 3.7V"). It would have taken too many hours at the low maximum output wattage of only 10W to measure the total Watt-Hours required to completely drain and then recharge the power pack.Note: This power pack would not be allowed as passenger airplane carry-on luggage (no power packs are allowed at all as checked luggage). The FAA regulations only allow carry-on lithium power packs with a capacity of 100Wh or less, the equivalent to a labeling of 27,027mAh or less.

No fast charging when I plugged in my samsung with the cable sent neither with my regular cable. Everything else is good. Bright lights, charging by the sun right now.

I ordered this solar charger for myself, but my husband quickly snagged it because he said it’ll be perfect for his retreat stand when he goes hunting. Guess I’m ordering another one for myself now! It’s got a huge 38800mAh capacity, waterproof design, and USB-C input/output, so it’s super versatile for all our devices iPhone, Samsung, iPad, you name it. Plus, the built-in LED flashlight is a great bonus for outdoor adventures. If you love outdoor gear that works as hard as you do, this is definitely a must-have!

I couldn’t be happier with this purchase. It works great and direct sunlight. I will be purchasing another one to keep in my car. This one will be in my house in case a power outage.

The charge well light stops working

I bought this to power the fan on an InstaFire Inferno Pro Stove (an indoor/outdoor camping & emergency stove) and for that it works great. It's well constructed, it has 3 USB ports, the flashlight is nice and bright, and the carabiner clip is a nice touch. However, as others have said, charging by the solar panel is slow; this is NOT a design flaw nor is it an underpowered solar panel. Doing a bit of research, most solar panels for a power bank in this size and price range typically provide 400-500 mAh. The capacity of the battery on this unit is 38800, so doing some basic math that means at a charging rate of 400 mAh (as listed in the manual for this model) it would take 97 hours to fully charge, and that's under ideal conditions. In the area that I live, the max amount of sunlight in a day is 16 hours, so that means it would take about 6 days to fully charge the battery. The solar panel is not really intended to completely charge up the battery, rather to 'top it up' after you've used it for a while, mainly for the flashlight. If you need to be able to solar charge this type of device faster, I suggest you purchase an additional solar charging panel; they can be purchased for $20 or less, and Amazon has plenty to choose from.