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The SunJack 25W kept the most output under clouds in Outdoor Life's testing and the most indirect-light charge in OutdoorGearLab's. **Highlights** - Best cloud result in independent tests - USB-C and USB-A - In stock at SunJack when checked **Watch-outs** - Heavier than the 15W - Small sunny gain over the 15W Research only: Wild10 has not field tested this model. Specifications come from the maker page; any measured figure is credited to the outlet that measured it.
Pros
- Best cloud result in independent tests
- USB-C and USB-A
- In stock at SunJack when checked
Cons
- Heavier than the 15W
- Small sunny gain over the 15W
Best uses
- Pacific Northwest
- Forest camps
- Northern lakes
Specifications
- Rated panel power
- 25 W
- Ports
- 1 x USB-C, 1 x USB-A (5V/3A each)
- Built-in battery
- None
- Weight
- 1.7 lb (0.77 kg) panel only, per maker
- Measured output
- 10.7 W USB-C sun, 6.6 W USB-C cloud (Outdoor Life)
- Measured 1 hour
- 1,918 mAh direct, 675 mAh indirect (OutdoorGearLab)
- Wild10 evidence
- Research only, not field tested
- Best for
- Best cloudy-weather output
Pricing
We don't publish a price we haven't verified. The retailer links below open the live listing for this exact model.
Best for
Pacific Northwest, Forest camps, Northern lakes
Where to buy the 25W ETFE Foldable Solar Charger
Prices and stock change often, so check the current Amazon offer before you buy.
Some links are affiliate links. Buying through them supports our testing at no extra cost to you.
The SunJack 25W kept the most output under clouds in Outdoor Life's testing and the most indirect-light charge in OutdoorGearLab's.
Why it ranks here
Outdoor Life measured 6.6 W from USB-C under clouds, the best cloud figure in its table for these panels. OutdoorGearLab recorded 675 mAh in one hour of indirect light, also the best of the panels it tested here.
Specs that matter on trail
Rated panel power: 25 W; Ports: 1 x USB-C, 1 x USB-A (5V/3A each); Built-in battery: None; Weight: 1.7 lb (0.77 kg) panel only, per maker; Measured output: 10.7 W USB-C sun, 6.6 W USB-C cloud (Outdoor Life); Measured 1 hour: 1,918 mAh direct, 675 mAh indirect (OutdoorGearLab). All figures are maker-stated unless a review outlet is named.
Limits and caveats
Sunny output was only slightly higher than the 15W version. It is heavier, so pick it for cloudy climates. OutdoorGearLab measured 833 g (29.4 oz).
How we picked
We started with a long list of backcountry solar chargers that people actually buy, cut anything that could not clear our baseline for durability and field performance, then ranked the 10 that were left against the same criteria. Rankings are editorial. No brand pays for placement, and affiliate links never move a pick up or down.
- Real-world output
- Usable charging in clouds or cold, not just the rated wattage or capacity.
- Ports and packability
- Port types, charging speed and weight for the power delivered.
- Real-world durability
- How the material, stitching, or steel holds up after a season of hard use — not how it looks new.
- Performance in bad conditions
- Wind, rain, cold, and grit are the test. Anything that only works on a nice day gets marked down.
- Weight and packability
- Every ounce has to earn its place in the pack, but not at the cost of something that fails in the field.
- Ease of use
- Setup, adjustment, and maintenance with cold hands, in the dark, without the manual.
25W ETFE Foldable Solar Charger — frequently asked questions
- Is the 25W ETFE Foldable Solar Charger worth it?
- We rank it #4 in Backcountry Solar Chargers. The SunJack 25W kept the most output under clouds in Outdoor Life's testing and the most indirect-light charge in OutdoorGearLab's. **Highlights** - Best cloud result in independent tests - USB-C and USB-A - In stock at SunJack when checked **Watch-outs** - Heavier than the 15W - Small sunny gain over the 15W…
- What is the 25W ETFE Foldable Solar Charger best for?
- Best for pacific northwest, forest camps and northern lakes. Standouts: best cloud result in independent tests and usb-c and usb-a.
- What are the downsides of the 25W ETFE Foldable Solar Charger?
- Heavier than the 15W and Small sunny gain over the 15W.
- What are the key specs of the 25W ETFE Foldable Solar Charger?
- Rated panel power: 25 W · Ports: 1 x USB-C, 1 x USB-A (5V/3A each) · Built-in battery: None · Weight: 1.7 lb (0.77 kg) panel only, per maker · Measured output: 10.7 W USB-C sun, 6.6 W USB-C cloud (Outdoor Life)
- Why it ranks here?
- 6 W from USB-C under clouds, the best cloud figure in its table for these panels. OutdoorGearLab recorded 675 mAh in one hour of indirect light, also the best of the panels it tested here.
- Specs that matter on trail — what should I know about the 25W ETFE Foldable Solar Charger?
- 6 W USB-C cloud (Outdoor Life); Measured 1 hour: 1,918 mAh direct, 675 mAh indirect (OutdoorGearLab). All figures are maker-stated unless a review outlet is named.
Compare side by side
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