The FlexSolar S60 60W Foldable Portable Solar Panel is the better portable solar panel overall, rated 4.3 to 3.9. The FlexSolar S60 60W Foldable Portable Solar Panel leads on portability and efficiency. The SinKeu 40W Foldable Solar Panel costs $17 less ($45.99 vs $62.99).
A light, packable panel for campers who mainly charge phones, power banks and small power stations, and it did well in independent testing. Anyone filling a larger station should step up to 100 W or more.
Amazon $62.99 FlexSolar $69.99A small, cheap panel for keeping phones, tablets and a small power station topped up on hikes or short trips. Anyone charging a mid-size station should look at 100 W and up.
Amazon $45.99Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every small portable solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | FlexSolar S60 60W Foldable Portable Solar Panel | SinKeu 40W Foldable Solar Panel |
|---|---|---|
| Overall rating | 4.3/5 | 3.9/5 |
| Value 30% | 100 $1.05 per rated watt | 100 $1.15 per rated watt |
| Tested output 20% | 78 best measured 83% of rated watts (1 test) | 89 not yet tested; estimated 87% of rated watts from the median of the 10 tested panels |
| Portability 15% | 100 23.1 W per lb (2.6 lb (1.2 kg)) | 51 12.1 W per lb (3.3 lb (1.5 kg)) |
| Durability 15% | 60 IP67 | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 10% | 83 24% claimed efficiency | 50 22% claimed efficiency |
| Features 10% | 20 USB output | 20 USB output |
| Tested by | Measured peak | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 50 W | 83% | OutdoorGearLab says the panel delivered over 50 W on a few occasions when charging a small power station over DC, propped toward the sun on clear summer days in Idaho; over USB-C it averaged more than 5,100 mAh per hour of midday July sun. Review published August 2026. |
No independent test published yet.
| FlexSolar S60 60W Foldable Portable Solar Panel | SinKeu 40W Foldable Solar Panel | |
|---|---|---|
| Output | ||
| Rated power | 60 W | 40 W |
| Tested output | 50 W (83%) | Not tested (estimated 87%) |
| Efficiency | 24% (Amazon listing and FlexSolar both claim up to 24% conversion efficiency without saying cell or module) | 22% ("up to" per the Amazon listing, not stated as cell or module) |
| Cells | Monocrystalline | Monocrystalline |
| Bifacial | No | No |
| Connections | ||
| Cables included | Solar charging cable with XT60, Anderson, DC7909 and DC5521 ends | DC-to-DC cable, 10-in-1 DC connector set |
| USB ports | 1x USB-C PD3.0 up to 40W, 1x USB-A QC3.0 up to 18W per the Amazon listing; DC output up to 60W at 20-28V. The junction box is not waterproof | 1x USB-C (5V/3A, 9V/3A, 12V/2.5A, 15V/2A), 1x USB-A QC3.0 (5V/3A, 9V/2A, 12V/1.5A), plus an 18 V DC output |
| Build | ||
| Weight | 2.6 lb (1.2 kg) | 3.3 lb (1.5 kg) |
| Folded size | 12.0 x 9.8 x 0.7 in | 12.6 x 9.1 x 2 in |
| Unfolded size | 54.8 x 12 x 1 in | 37.8 x 12.6 x 0.2 in |
| Folding sections | 6 | - |
| Kickstand | No | - |
| Water resistance | IP67 | - |
