USB panels that charge a phone in the sun, and store nothing · review
A 28 W foldable USB solar charger with N-type cells at 25.4%, two USB-C and one USB-A port, IP44, at 1.5 lb. It charges devices directly; it stores nothing.
BigBlue’s 28 W charger uses N-type cells at a stated 25.4% efficiency, with a front surface free of metal lines to reduce shading. It folds to 11 × 6 × 1.4 in and weighs 1.5 lb. Two USB-C ports and one USB-A port each deliver 5 V at up to 3 A, with a combined 5 V at 4.8 A, roughly 24 W.
BigBlue says it twice: this panel does not store energy. It charges what is plugged in while the sun shines, and output varies with sunlight, angle and the device. Pair it with a power bank to bank the day’s energy.
Keep phones and tablets in the shade: direct sun can trigger their thermal protection and stop charging. Do not use the panel behind a window or windscreen. The surface is rated IP44, enough for light rain and fog.
BigBlue-US listed it at $79.96 on November 2, 2026, with a 50 cm USB-C cable and carabiners in the box.
Prices quoted in this text were read on November 2, 2026. The live price is at the top of the page.
| Rated power | 28 W |
|---|---|
| Cells | N-type, 25.4%, shadow-free front with no metal lines |
| Outputs | 2 × USB-C and 1 × USB-A, 5 V/3 A each, 5 V/4.8 A combined |
| Battery | None: charges devices directly |
| Water rating | IP44 |
| Folded size | 11 × 6 × 1.4 in |
| Weight | 1.5 lb |
| In the box | 50 cm USB-C cable, carabiners |
| Amazon reference | B01EXWCPLC |
BigBlue warns that a phone in direct sun can trigger its own thermal protection. Keep the device in the shade while the panel stays in the sun.
No. Each port supplies 5 V at up to 3 A, and the three together 5 V at 4.8 A. That is standard USB charging, not PD fast charging.
BigBlue does not recommend using it behind a window or windscreen.
7.8/ 10
A light, efficient 28 W panel with USB-C, from a long-established brand. Its 5 V ports charge steadily, not fast, and it stores nothing.
Same category, nearby prices, between portable power units. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Rated power | Cells | Water rating | Weight |
|---|---|---|---|---|---|
| BigBlue 28 W solar charger | $80 | 28 W | N-type, 25.4%, shadow-free front with no metal lines | IP44 | 1.5 lb |
| BigBlue 28 W solar charger with ammeter | $78 | 28 W | 25.4% efficiency, no front metal lines | IP44; keep the USB ports and ammeter dry | 595 g (1.3 lb) |
| MARBERO 30 W solar panel charger | $60 | 30 W | 21.5–23.5% efficiency | IP65 | 2.4 lb (1.3 kg in the spec table) |
| Ecosonique 30 W foldable solar charger | $46 | 30 W | Monocrystalline, 23.5% | IP67 | 1.7 lb |
Backpacking and emergency kits for phones, power banks and GPS units
Specifications: the manufacturer sheet for portable power gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
28 W foldable USB solar charger with a digital ammeter, 25.4% cells, USB-A 5 V/2.4 A and USB-C 3 A, PET fabric, IP44, 595 g (1.3 lb), no internal battery, 18-month warranty
A 28 W solar charger with a built-in ammeter that shows live output, 25.4% cells and an 18-month warranty, at 1.3 lb and $77.96.
Best for: Hikers who want to see whether the angle is right, and buyers who value the warranty
≈ $78
30 W tri-fold USB solar charger, ETFE laminate, 23.5% monocrystalline cells, USB-C and USB-A at 5 V/3 A each, IP67, 1.7 lb, 12-month warranty
A 30 W tri-fold ETFE solar charger rated IP67, the toughest here, with USB-C and USB-A, at 1.7 lb and $45.99, the cheapest USB charger on this shelf.
Best for: Rainy-climate hiking and budget emergency kits
≈ $46
28 W four-panel USB solar charger with SunPower Maxeon cells, two USB-A ports, LED current checker, two adjustable stands, water-resistant ripstop nylon, 771 g (1.7 lb), iF Design Gold Award, 1-year warranty
A 28 W four-panel charger with SunPower Maxeon cells, a current checker and built-in stands, in ripstop nylon. Award-winning design, USB-A only, $129.99.
Best for: Campers who want a well-made panel that stands on its own
≈ $130
