ALLPOWERS SF400 400W Flexible Solar Panel

13th of 23 we've scored in Flexible Solar Panels

13th of 23 in Flexible Panels

ALLPOWERS SF400 400W Flexible Solar Panel

400 W or more panel
2-year warranty

SVT Score, Mid

Usability4.0/10Social4.8/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A 400 W frameless ETFE flexible panel rated IP68, weighing 17.3 lb, sold only as a pair for large RV, van and boat roofs.

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SKU: AP-SF-400 Category: Flexible Solar Panels Brand: ALLPOWERS

Usability

4.0 out of 10

Capacity10400 W rated at STC, on the 220 W and up rung for flexible panels

Electrical: 63.1 V and 6.34 A at maximum power, 74.46 V open circuit, 6.85 A short circuit, all ±5 percent

Efficiency219.5 percent computed from 1762 x 1162 mm, on the 18 to 19.9 percent rung

Marketed: cell conversion of 23 percent on the page and 22 to 25 in the manual

Lifespan1No power-output warranty on the product page, in the policy or in the manual

Cap: flexible panels are capped at 5; the ETFE front allows the full cap

Better on lifespanBougeRV Yuma 200W CIGS Panel$399.99Scores 5.0

Features4IP68 and an ETFE front; no station adapter in the box and no diode count

Range: the manual rates it to run from −4 to 185 °F (−20 to 85 °C)
Diodes: the manual says bypass diodes sit in the junction box but gives no count
Voltage: the manual lists a 1000 V maximum system voltage, against 120 V for the smaller SF panels

Better on featuresRenogy 200W Flexible PanelIP68 junction box. $311.99Scores 6.0

Verification2no directory record for the SF400; CE, FCC and RoHS marks only (manual and page).

Searched: Intertek UL TÜV SÜD Certipedia SGS CEC LabTest

Warranty & Support32 years in the ALLPOWERS warranty policy and on the product page

Manual: the user manual's contact section says 18 months

Better on warranty & supportBougeRV Yuma 200W CIGS PanelBougeRV's spec table. $399.99Scores 8.0

Price

List: $550.00 per panel at iallpowers.com, sold as a set of two at $1,099.99

Summary

Big output per Panel, sold only in pairs

What it is: a 400 W frameless ETFE flexible panel sold only as a pair
The trade-off: IP68, an ETFE front and 400 W per panel, but 19.5 percent module efficiency, no station lead and no output guarantee
Not checked: the temperature coefficient, the connector type and the bypass-diode count; ALLPOWERS publishes none for this panel
Look elsewhere for: a single panel, an output guarantee or a longer warranty

Strengths

High output from one panel
Waterproof junction and panel rating
ETFE front rather than a coating
Bends to fit curved roofs
Thin and light for its output

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Drawbacks

No power-output warranty
Sold only in pairs
No station adapter listed in the box
No temperature coefficient published
Manual and policy give different warranty terms

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Social score

4.8 out of 10

RedditBrand-level4 out of 10

r/SolarDIY: an owner of the 400 W folding panel read at best the mid-270s W at midday under a clear sky on a third-party station, about 68 percent of rated (June 2023)
Replies: commenters found its 37.4 V and 10.6 A within the station's input and asked whether shade or a battery above 75 percent was limiting it (June 2023)
r/GoRVing: an owner whom ALLPOWERS offered a station for review found its 100 W folding panel light, well made and quick to set up, but hard to open in wind (2024)

GoogleBrand-level5 out of 10

OutdoorGearLab: bought its own SP012 100 W folding panel and earns commission through links; it held 40.3 W in direct sun, near the top of the test, and put 56.8 Wh into a test battery (July 2024)
Shortfalls: OutdoorGearLab measured about 7 W in indirect light and noted the SP012 has no kickstand (July 2024)
The Gadgeteer: tested a 400 W SP037 that ALLPOWERS supplied, with an Amazon code; read 42 V open-circuit on an overcast 31 °F day and liked its kickstands and cable pocket, but measured no watts (January 2023)

YouTubeProduct-line5 out of 10

Urban Survivor: read about 83 W angled from an SF100 and 154 W angled from an SF200 of the same SF line (December 2023, about 8,900 views); the description carries Amazon affiliate links
SmitHVAC: called the SF100 and SF200 convenient for camping or a vehicle roof (April 2024, about 16,600 views); ALLPOWERS sent them, YouTube labels it paid promotion and it carries a 10 percent code

AmazonProduct-line5 out of 10

Listing: ALLPOWERS's own Amazon US file titled SF200 (B0FCMCL4L2) carries 21 W to 400 W options under one rating, 3.9 from 244 ratings (October 2026)
Themes: Amazon's review digest calls output and durability mixed, with one buyer reporting a failure after two months (October 2026); the star split sits behind sign-in
Second file: B0FX4BX82M, titled SF200 but merged with folding panels and a 21 W charger, shows 4.2 from 2,021 ratings (September 2026)

User reviewsNot scored

The retailer pool is blank: Walmart.com is the only US retailer found listing ALLPOWERS panels, all through ALLPOWERS US, and no listing there holds ten native unflagged reviews of one panel; Home Depot, Lowe's, Best Buy and REI list none (October 2026).

Trustpilot

Trustpilot rates Allpowers (iallpowers.com) 2.1 from 30 reviews on a page claimed in August 2024 that has not invited reviews and has not replied to negative ones, 20 percent five-star and 67 percent one-star (October 2026).

Track record

The BBB rates Allpowers of Walnut, California an F, not accredited, with 7 complaints in three years (October 2026).
No CPSC or Health Canada recall names any ALLPOWERS product, its solar panels included, searched in October 2026.

Not countedExcluded

Not counted in any pool: iallpowers.com's own reviews and entries reposted from it, the r/Allpowers_Official subreddit its stores link, r/allpowerssolar, which carries ALLPOWERS' own posts, ALLPOWERS' YouTube channel and its ALLPOWERS Club Facebook group, and its staff posts, all first-party.
Also not counted: ALLPOWERS' affiliate program and the discount codes its creators carry, reviews flagged Incentivized at Walmart, and anything gathered in ALLPOWERS promotions.
The retailer pool is blank: no Walmart.com, Home Depot, Lowe's, Best Buy or REI listing of the SF400 set was found (October 2026).

Summary

Brand-level

2.1 on Trustpilot, F BBB rating

Specs

CapacityNot applicable
AC OutputNot applicable
System VoltageNot applicable
Panel Power400 W or more
Charge CurrentNot applicable
Safety ListingNone verifiable
Low-Temp ChargingNot applicable
Warranty2 Years
MonitoringNot applicable
Weight17.3 lb

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Not published by ALLPOWERS: cell type.

At a glance

74.46 V open-circuit voltage
Two panels per set
0.11 in (3 mm) thick

Company

ALLPOWERS INC of Diamond Bar, California, sells ALLPOWERS in the US, and the brand belongs to Guangzhou Allpowers Energy Technology Co., Ltd. of Guangzhou, China.

Where it sells

It sells its folding panels from 100 to 600 W and its 100 to 400 W flexible panels with a cart at iallpowers.com and on Amazon US through its own ALLPOWERS store, and some of its panels are listed at Walmart.com.
ALLPOWERS sells on Walmart.com as its own marketplace seller, ALLPOWERS US.

Description

The ALLPOWERS SF400 (model AP-SF-400 in its manual, store SKU 2 x AP-SF-400 for the pair) is a frameless 400 W flexible panel of monocrystalline cells under a honeycomb ETFE front, about 3 mm (0.11 in) thick.

It is rated 400 W ±5% at standard test conditions, with 63.1 V and 6.34 A at maximum power, 74.46 V open-circuit and 6.85 A short-circuit, and ALLPOWERS markets cell conversion of 23%. It measures 69.37 x 45.75 in (1762 x 1162 mm) and weighs 17.3 lb (7.85 kg).

The product page rates it IP68, and the manual gives an operating range of −4 to 185 °F (−20 to 85 °C) and bypass diodes in the junction box. The box holds two panels and the manual, with no station cable listed. It is sold only as a set of two at $1,099.99, so the row is priced per panel at $550.00.

ALLPOWERS's warranty policy and the product page give 2 years, while the manual says 18 months.