A 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.
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Output | |
|---|---|
| Rated power | 40 W |
| Tested output | Not tested (estimated 87%) |
| Efficiency | 22% ("up to" per the Amazon listing, not stated as cell or module) |
| Cells | Monocrystalline |
| Bifacial | No |
| Connections | |
| Cables included | DC-to-DC cable, 10-in-1 DC connector set |
| USB ports | 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 | 3.3 lb (1.5 kg) |
| Folded size | 12.6 x 9.1 x 2 in |
| Unfolded size | 37.8 x 12.6 x 0.2 in |
A cheap, light 100 W panel for topping up a small power station on camping trips. Buyers who want consistent published specs and a longer warranty should pay more for an established brand.
Amazon $89.99A dependable, low-voltage 100 W briefcase panel for small power stations, with adapters for most older barrel and Anderson inputs. Owners of XT60 stations should budget for an adapter.
Amazon $109.98For tightly curved or irregular surfaces such as boat biminis and teardrop roofs, where silicon flexible panels would crack. On a gently curved roof, a silicon flexible panel gives more watts per dollar.
Amazon $209.99 BougeRV $249.99Compare the SinKeu 40W Foldable Solar Panel with any other portable solar panel →
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