SunJack 15 Watt Foldable Solar Panel

I purchased this along with a SunJack battery and took it on a week long trip into the Boundary Waters. There is no cell service where I was so the phones were kept on Airplane mode most of the time. But with people taking pictures/video, and watching some movies, a new iPhone and Samsung were kept at full charge for the trip. I pre-charged the battery before leaving. While you can charge a phone directly off the SunJack, you're best off charging a dedicated battery through the day, and then re-charging devices in the evening off the battery. The solar panels are quite rugged which attributes to some of the weight of the unit. I essentially left it outside for our 7 day trip, never taking it inside the tent. So it went through sun, rain, cool nights, and morning fog (so much dampness in the air, all our phones were reporting moisture in the USB ports), It was also left perched up on a rock in the sand. No issues whatsoever. It is somewhat larger than I expected, but I wanted to be sure I had enough wattage to keep everyone topped off. The small battery packs with a solar panel built-in would take days to re-charge the attached battery, so that was not going to be acceptable. I was also able to charge my drone battery and controller. I especially like the attached nylon zipper pouch to keep cables and the battery with the panel. It came with some USB cables, but we had a few different devices with us so I needed a bunch of charging cables. The pouch really helped keep the "charging station" organized. Almost zero weight added to the overall system, and really worth it. Setup is super simple, just attach a dedicated battery or phone (whatever you wish to charge) and your off and running. I didn't have a volt meter to measure actual output, and most days were sunny, but even in the early morning, I'd attach the battery and see the light blinking on the battery so it was charging if even a little. I could probably have kept 4-5 phones topped off, but for our system, I'd just set it and forget it. Then remove the dedicated battery in the evening to recharge a phone overnight. Then, just re-attach the battery in the morning. The battery would be fully charged by mid-afternoon (on a full-sun day) so people would top off periodically. Essentially it worked as expected, is light enough to backpack, very durable, and worked like a charm. So if you can spare a little room in your backpack (I never traveled with it hanging out of the backpack) you'll be quite happy with your investment.

i have been been using the 15watt solar panel for over a year. i have mounted it on my bike, sometimes on the front & sometimes on the back. it has never failed me even with bad weather. it can charge my phone & power bank in just a few hours. i luv it! definetly recommended!

Works. Finally. I have had them all. I literally have 10 different solar chargers. At best 1 out of 4 solar chargers actually work. Most are simply scams or overrating their output so much its silly. I need them for work (expeditions - reality shows). This one works. It does not output 15w, but it does output about 5-6w and does not discharge your battery backwards in cloudy weather or shade. Yes. Backflow into the solar panels is a real thing.

Got my powerbank charged to full in about 6 hours in the Cali sun. Functionally, pretty perfect. However I'm looking to do some ultralight backpacking and it feels about 8 ounces heavier than I would like. I may keep looking for something lighter that is equally useful.

Works and charges great. Good for waterproof camping and travel, especially on the back of a kayak to charge a portable battery!

This panel is light and compact. However, on a day that turned cloudy, it discharged my phone rather than charging it. The Big Blue 28 watt has circuitry to prevent this. Also, in full sun, the SunJack took over 4 hours to charge my battery 25%. (10,000 mAH battery). Sending it back.

I measured <9W when testing in high sun with no clouds, but, this performed much better than BigBlue who advertised 25W and only measured <5W. Also nice and lightweight, although not the most compact.

I bought the 15watt version around 7 years ago. Most of that time it has lived in my sailboat. I hang it outside while at anchor. It's able to charge my phone, a tablet, and a powerbank (one at a time). In the Bahamian sun, it worked like a charm. Going to purchase a larger one now that I have larger power banks. Very happy with my purchase.

Perfect size, very strong, charges quickly in direct sunlight

Very happy with the price and product 👍🏻

So VERY, VERY disappointed in this product. It simply does NOT do what is claimed. I placed it in full Australian sun - Queensland for 4 days & it still couldn't charge a 60 % mobile phone to full in less than 4 hours. The product information clearly stated it could do this in 2 hours. I want my money back