The Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel is the better portable solar panel overall, rated 4.5 to 4.1. The Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel leads on portability and efficiency. The GRECELL 100W Portable Solar Panel (SP-100) wins on features and value. The GRECELL 100W Portable Solar Panel (SP-100) costs $40.01 less ($109.98 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 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 $109.98Prices 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 | GRECELL 100W Portable Solar Panel (SP-100) |
|---|---|---|
| Overall rating | 4.5/5 | 4.1/5 |
| Value 30% | 89 $1.50 per rated watt | 100 $1.10 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 | 100 best measured 100% of rated watts (1 test) |
| Portability 15% | 100 23.9 W per lb (4.2 lb (1.9 kg)) | 35 10.2 W per lb (9.8 lb (4.5 kg)) |
| Durability 15% | 100 IP68, 3-year warranty | 50 IP rating and warranty not published (neutral score used) |
| Efficiency 10% | 100 25% claimed efficiency | 75 23.5% claimed efficiency |
| Features 10% | 0 no kickstand, USB or bifacial cells | 55 built-in kickstand, series/parallel |
No independent test published yet.
| Tested by | Measured peak | Of rated | Conditions |
|---|---|---|---|
| The Gadgeteer | 100 W | 100% | Reviewer saw the wattage ‘jump right to 100+ watts’ and hold there on a winter day, kickstands angled for the low sun, charging a GRECELL T-500 power station; metering method not stated. Review published December 2022. |
| Renogy Flex ShadowFlux 100W N-Type Anti-Shading Flexible Solar Panel | GRECELL 100W Portable Solar Panel (SP-100) | |
|---|---|---|
| Output | ||
| Rated power | 100 W | 100 W |
| Tested output | Not tested (estimated 87%) | 100 W (100%) |
| Efficiency | 25% (cell efficiency ("up to 25%")) | 23.5% (cell efficiency per GRECELL's SP-100 spec table (grecell.com product feed)) |
| Cells | Monocrystalline (N-type TOPCon, cell-level bypass diodes (ShadowFlux)) | Monocrystalline |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 33.6 V | 23.9 V |
| Voltage at max power (Vmp) | 28.8 V | 20 V |
| Short-circuit current (Isc) | 3.7 A | 5.2 A |
| Current at max power (Imp) | 3.5 A | 5 A |
| Series / parallel | - | Yes |
| Connections | ||
| Output connector | - | MC4 |
| Cables included | - | MC4 to Anderson cable, MC4 to DC5521 cable, DC5521 to DC5525 adapter, DC5521 to DC7909 (8 mm) adapter, DC5521 to DC3515 adapter |
| USB ports | None | - |
| Build | ||
| Weight | 4.2 lb (1.9 kg) | 9.8 lb (4.5 kg) |
| Flexible | Yes, bends up to 270° | - |
| Dimensions | 37.09 x 24.13 x 0.10 in | - |
| Folded size | - | 25.2 x 21.1 x 2.5 in (640 x 536 x 65 mm) |
| Unfolded size | - | 50.55 x 21.1 x 0.2 in (1284 x 536 x 5 mm) |
| Kickstand | No | Yes |
| Water resistance | IP68 | - |
| Warranty | 3 years | - |
| Output warranty | 3-year power output warranty | - |
