ALLPOWERS SP037 400W Foldable Portable Solar Panel

17th of 39 we've scored in Portable Solar Panels

17th of 39 in Portable Panels

ALLPOWERS SP037 400W Foldable Portable Solar Panel

400 W or more panel
2-year warranty

SVT Score, Mid

Usability4.6/10Social5.3/10The SVT Score is placed on its category's range

Versus

SVT SCORESRead review

A 400 W five-section ETFE folding panel with kickstands and XT60 and DC cables in the box, weighing 40.79 lb, for large ALLPOWERS and other MC4 power stations.

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SKU: AP-SP-037-BLA Category: Portable Solar Panels Brand: ALLPOWERS

Usability

4.6 out of 10

Capacity10400 W rated, on the 400 W and above rung for portable panels

Electrical: 45.3 V open circuit, 11.7 A short circuit, 37.4 V and 10.69 A at maximum power

Efficiency414.3 percent computed from 1048 x 2660 mm, on the 14 to 14.9 percent rung

Marketed: a 22 percent conversion rate on the page and 19 to 23 percent in the manual, against the computed module figure
Cells: the product page and the Flash Deal page call the cells polycrystalline

Better on efficiencyAnker SOLIX PS200 BifacialAnker markets conversion efficiency of 25 percent. $499.99Scores 10.0

Lifespan1No power-output warranty on the product page, in the policy or in the manual's readable text

Better on lifespanRich Solar MEGA 200 Briefcase PanelRich Solar's spec sheet promises a 25-year output warranty. $399.99Scores 7.0

Features6IP66 in the manual, ETFE front, kickstands, MC4 with XT60 and DC cables; no diode count

Weather: the manual rates it IP66; the product page says IP67

Verification2no directory record for the AP-SP-037; CE, FCC and RoHS marks only (manual and page).

Searched: Intertek UL TÜV SÜD Certipedia SGS CEC LabTest

Better on verificationJackery SolarSaga 200W Bifacial Portable Solar PanelNo Intertek. $379Scores 4.0

Warranty & Support324 months in ALLPOWERS' warranty policy; two years on the product page

Better on warranty & supportAnker SOLIX PS200 BifacialAnker's warranty policy. $499.99Scores 6.0

Price

List: $299.00 at iallpowers.com

Summary

Big output for The money, heavy carry

What it is: a 400 W five-section ETFE folding panel with kickstands and XT60 and DC cables in the box
The trade-off: a lot of watts for the money, but low module efficiency, about 41 pounds to carry and no output guarantee
Not checked: the temperature coefficient, bypass diodes and any output term in the manual, whose body text is printed as images
Look elsewhere for: a lighter panel, monocrystalline cells or an output guarantee

Strengths

Very high output from one panel
Low price for its output
Adjustable kickstands set the angle
Station and DC cables in the box
Scratch-resistant ETFE surface

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Drawbacks

No power-output warranty
Below-typical module efficiency
Heavy and awkward to set up alone
Waterproof rating differs between manual and page
No temperature coefficient published

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Social score

5.3 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)

Google6 out of 10

Liked

Strong output on a cloudy day (The Gadgeteer)
Station cables in the box (The Gadgeteer)
Tie-down loops for wind (The Gadgeteer)

Read the full summary

The Gadgeteer: read 329 W from the SP037 on a cloudy day and said that far exceeded what it expected for the conditions (January 2023)
Tie: The Gadgeteer says ALLPOWERS provided the sample, and it printed an Amazon discount code, so it is not independent
In the box: the reviewer listed an MC4 to XT60 cable and an MC4 to DC5525/DC8020 cable and noted loops for tying the panel down in wind (January 2023)

YouTube5 out of 10

Liked

Recommended outright (Scottage On Wheels)
Works in series with a smaller panel (My PlayHouse)

Read the full summary

My PlayHouse (Morten Hjorth): tried the SP037 alone and in series with a 200 W panel (June 2023, about 4,300 views)
Tie: he thanks ALLPOWERS for sponsoring the video and sending the panel, and gives a 10 percent discount code, so it is not independent
Scottage On Wheels: reviewed and tested it and said he would 100 percent recommend it (May 2024, about 2,400 views); the description carries affiliate links and a discount code

AmazonProduct-line6 out of 10

Listing: ALLPOWERS' Amazon US listing for the SP037 (B0BG6ZTJB2) reads 4.1 from 1,830 ratings, while ALLPOWERS' own comparison table there gives 4.2 from 2,030 to every panel in its range (October 2026)
Copy: the same listing's bullets give the folded size and 12.5 kg weight of a 600 W panel, a sign the file is shared across panels (October 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: Walmart.com lists the SP037 400 W panel only inside station kits, none of them holding ten native unflagged reviews of the panel, and Home Depot, Lowe's, Best Buy and REI do not list it (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
Weight40.8 lb

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Not published by ALLPOWERS: cell type.

At a glance

45.3 V open-circuit voltage
41.3 x 20.9 x 2.6 in folded
XT60 and DC5525 leads

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 SP037 (model AP-SP-037 in its manual, store SKU AP-SP-037-BLA) is a five-section folding panel with an ETFE surface and adjustable rear kickstands, and the store also lists it on a Flash Deal page that calls its cells polycrystalline.

It is rated 400 W, with 45.3 V open-circuit and 11.7 A short-circuit, 37.4 V and 10.69 A at maximum power, and ALLPOWERS markets a 22% conversion rate (19 to 23% in the manual).

Unfolded it measures 1048 x 2660 x 5 mm (41.26 x 104.72 x 0.2 in), folded 1048 x 532 x 65 mm (41.26 x 20.94 x 2.56 in), and it weighs 18.5 kg (40.79 lb). The manual rates it IP66 and the product page IP67.

The box holds the panel, a solar-to-XT60 cable, a solar-to-DC5525 and DC8020 adapter cable and the manual, and the panel's output ends in MC4 connectors. ALLPOWERS' warranty policy lists the SP037 at 24 months and the product page says two years. It sells at $299.00 on iallpowers.com.