ALLPOWERS SP037 400W Foldable Solar Panel - Portable 400W Solar Power With 22% Efficiency

ALLPOWERS SP037 400W Foldable Solar Panel is designed as a portable 400W solar module that can be folded for transport and deployed to feed modern power stations in off-grid situations from RV trips to emergency backup at home.

Design, Output And Core Specifications

The SP037 is specified with a peak power output of 400W, giving enough headroom to charge midsize and larger portable power stations during a full day of sun when set up correctly.Peak power 400W The panel uses polycrystalline silicon cells laminated under ETFE, and manufacturer and test data state a solar conversion rate up to 22%, which is on the higher side for portable gear in this output class.Solar conversion rate 22% Electrically, the SP037 is rated with a voltage at maximum power (Vmp) of 37.4V and an open-circuit voltage (Voc) of 45.3V, while current at maximum power (Imp) is 10.6A and short-circuit current (Isc) is 11.45A, values that match MPPT inputs on many portable generators and inverters.Electrical ratings Vmp, Voc, Imp, Isc

For physical handling, retailer data give the SP037 a net weight of 18.5 kg, or about 40.8 lb, and show package dimensions around 40.94 x 23.62 x 4.72 inches, placing it in the range of what a single adult can carry but not a small, ultralight panel.Weight and package dimensions Manufacturer specifications describe a folded size around 41.3 x 20.9 x 2.6 inches and an unfolded footprint roughly 41.3 x 104.7 x 0.2 inches, giving a long, five-panel layout that acts like a narrow solar "strip" once deployed.Folded and unfolded dimensions

Build Features, Connectors And Included Cables

The SP037 is advertised with an IP67 water resistance rating, meaning the housing and cable interfaces are built to keep dust out and tolerate immersion up to a limited depth, which is significant for outdoor use around campsites or vehicle roof mounts.IP67 and ETFE description The ETFE surface is intended to add durability and improve light transmission compared with standard PET laminates, a detail reinforced by independent reviewers that point to a measured efficiency in line with the 22% claim.Review observations on efficiency and build

Shipping contents for the SP037 typically include the foldable 400W panel itself, one XT60 solar cable, an adaptor cable that breaks out to DC 5525 and DC 8020 barrel connectors, and a user manual, covering the most common port types on ALLPOWERS power stations without extra accessories.Box contents and adaptor cables On the generator side, documentation and product pages repeatedly highlight compatibility with ALLPOWERS R1500, R2500, R3500, R4000, S2000 and S2000 Pro models, making the SP037 an obvious match for buyers already in that ecosystem while still working with other brands at the right voltage and current inputs.Compatibility list for ALLPOWERS power stations

Manufacturer Identity And US Presence

ALLPOWERS as a brand is associated with Guangzhou Allpowers Industrial International Ltd., described in trade profiles as a professional manufacturer of portable power stations, flexible solar panels and solar chargers headquartered in Guangzhou, China.Manufacturer profile In addition, company contact listings identify a dedicated entity "ALLPOWERS INC" in Ontario, California, with a published US phone number and address, indicating a formal US sales and support presence for customers buying the SP037 and related products in the United States.US contact entity

Price Positioning And US Market Context

A US electrical supplier lists the ALLPOWERS SP037 400W foldable solar panel at $574.73, marked down from a reference price of $908.60, showing how high-output portable panels in this range can approach the upper midrange of off-grid hardware pricing (as of 09/17/2026).$574.73 price listing In comparative terms, review coverage points out that the SP037 offers one of the higher outputs among foldable panels and sits above many 100W to 200W portable competitors, so the price reflects the jump to 400W peak power rather than a direct match with smaller camping panels.Comparison with smaller panels

Comparison With Typical Portable Panels And Use Cases

Independent testing calls out that the SP037 carries five folding segments and efficiency around 22%, which means it can deliver more energy per setup session than typical 100W or 200W foldable panels that often operate in the high-teens percentage and have smaller surface areas.Efficiency comparison The trade-off is clearly seen in weight: at around 18.5 kg and over 40 lb, the SP037 is substantially heavier than compact travel panels, but for users with larger power stations or RV installations, output and efficiency tend to outweigh the additional bulk.Weight trade-off

ALLPOWERS positions the SP037 as a match for its R1500, R2500, S2000 Pro and R4000 power stations, and the electrical ratings of 37.4V Vmp and 10.6A Imp fit neatly within solar inputs typically rated near 400W on these generators.Intended pairings with power stations For buyers comparing options, that direct compatibility and the inclusion of XT60 and barrel connectors mean less need for third-party adapters and lower risk of mismatched voltages when combining the panel with mainstream portable power units.

Position In The Segment And Practical Verdict

Within the category of foldable solar panels for portable power stations, the ALLPOWERS SP037 400W Foldable Solar Panel stands out by combining 400W peak output, a documented conversion rate up to 22% and IP67-rated ETFE construction with a weight and footprint that suit RV owners, van builders and stationary off-grid setups more than ultralight backpack use.Segment placement based on specs The SP037 is best suited to users who already own or plan to buy midrange to large portable power stations compatible with 37.4V solar inputs and who value faster charging and better utilization of sunny days over minimum carrying weight, while shoppers focused on day-hike portability or casual use will typically gravitate to lower-wattage panels instead.