The Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel is the better portable solar panel overall, rated 4.5 to 3.9. The Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel leads on durability and efficiency. The FlexSolar S100 100W Foldable Portable Solar Panel wins on value. The FlexSolar S100 100W Foldable Portable Solar Panel costs $60 less ($89.99 vs $149.99).
For curved roofs with vents, racks or antennas that shade part of the panel during the day. With clear sun on an open roof, Renogy’s standard 100 W flexible panel costs less.
Amazon $149.99 Renogy $172.99A good pick for hikers and car campers who want 100 W-class solar that packs small and weighs about 4 lb. Anyone charging a bigger power station should look at a heavier panel with a stand and published electrical specs.
Amazon $89.99 FlexSolar $89.99Prices 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 | Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel | FlexSolar S100 100W Foldable Portable Solar Panel |
|---|---|---|
| Overall rating | 4.5/5 | 3.9/5 |
| Value 30% | 89 $1.50 per rated watt | 100 $0.90 per rated watt |
| Tested output 20% | 91 not yet tested; estimated 87% of rated watts from 1 test of Renogy panels and the median of the 10 tested panels | 33 best measured 70% of rated watts (1 test) |
| Portability 15% | 100 23.9 W per lb (4.2 lb (1.9 kg)) | 100 24.4 W per lb (4.1 lb (1.9 kg)) |
| Durability 15% | 100 IP68, 3-year warranty | 60 IP67 |
| Efficiency 10% | 100 25% claimed efficiency | 67 23% claimed efficiency |
| Features 10% | 0 no kickstand, USB or bifacial cells | 0 no kickstand, USB or bifacial cells |
No independent test published yet.
| Tested by | Measured peak | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 70 W | 70% | OutdoorGearLab’s measured-watts figure from its charging test (70 W generated in one hour); panel lay flat, exact sun conditions not given |
| Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel | FlexSolar S100 100W Foldable Portable Solar Panel | |
|---|---|---|
| Output | ||
| Rated power | 100 W | 100 W |
| Tested output | Not tested (estimated 87%) | 70 W (70%) |
| Efficiency | 25% (cell efficiency ("up to 25%")) | 23% (Amazon listing claims 23%+ conversion efficiency without saying cell or module; FlexSolar's own page gives no figure) |
| Cells | Monocrystalline (N-type TOPCon, cell-level bypass diodes (ShadowFlux)) | Monocrystalline |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 33.6 V | - |
| Voltage at max power (Vmp) | 28.8 V | - |
| Short-circuit current (Isc) | 3.7 A | - |
| Current at max power (Imp) | 3.5 A | - |
| Connections | ||
| Cables included | - | 2 m 4-in-1 DC adapter cable (Anderson, XT60, DC7909, DC5521) |
| USB ports | None | - |
| Build | ||
| Weight | 4.2 lb (1.9 kg) | 4.1 lb (1.9 kg) |
| Flexible | Yes, bends up to 270° | - |
| Dimensions | 37.09 x 24.13 x 0.10 in | - |
| Folded size | - | 12.99 x 10.43 x 2.17 in (330 x 265 x 55 mm) |
| Unfolded size | - | 45.47 x 26.18 x 0.59 in (1155 x 665 x 15 mm) |
| Folding sections | - | 10 |
| Kickstand | No | No |
| Water resistance | IP68 | IP67 |
| Warranty | 3 years | - |
| Output warranty | 3-year power output warranty | - |
