ALLPOWERS SP037 400W Foldable Solar Panel - High Output Portable Power For Off Grid Use

ALLPOWERS SP037 400W foldable solar panel delivers up to 400W of solar output with a rated conversion efficiency around 22% and IP67 water protection for outdoor use. For off grid campers and RV users, its roughly 40 lb weight and suitcase style folding format matter most.

ALLPOWERS SP037 400W Foldable Solar Panel brings utility scale output into a portable format, turning a five panel folding array into a mobile power source for camping, RV boondocking and home backup setups. The panel is designed to deliver a peak 400W of solar power at around 22% conversion efficiency, enough to keep large lithium power stations charged in full sun when positioned correctly.Manufacturer specifications list 400W output, 22% conversion rate and a polycrystalline ETFE construction with IP67 protection.

Power Output And Core Specifications

The SP037 panel targets users who need higher output than typical 100-200W camping panels, with a rated peak power of 400W from its polycrystalline cells and an efficiency spec around 22%. Electrical characteristics include a maximum power voltage of about 37.4V and a maximum power current roughly 10.6A, with an open circuit voltage near 45.3V and short circuit current around 11.45A, placing it in the high power portable category for DC coupled solar generators.Independent testing has reported similar figures including 37.4V Vmp, 45.3V Voc, 10.6A Imp and 11.45A Isc on the SP037 module.

To protect the cells and wiring, the panel uses an ETFE laminated surface and carries an IP67 water rating, meaning the housing is dust tight and can withstand immersion in water for a limited time. That is a stricter rating than basic splash resistant outdoor panels and aligns the SP037 with more demanding use around campgrounds and RV sites where sudden rain or puddles can be a factor.Series information for ALLPOWERS solar panels highlights IP67 protection and ETFE lamination on the SP037 portable unit.

Physical Design And Portability

Despite its output, the SP037 remains a portable device rather than a fixed roof module. When folded, the body forms a suitcase style package in the neighborhood of 40-41 inches long, roughly 21-24 inches high and about 2.5 inches thick, and the weight is documented around 40.8-40.79 lb depending on the listing, making it manageable for most users to carry short distances from vehicle to setup area.One detailed specification sheet for the 400W portable panel notes a folded size around 41.3 x 20.9 x 2.6 inches and a weight of about 40.8 lb.

Unfolded, users deploy five linked sections to reach an overall width over 100 inches, with lengths listed around 104-104.7 inches and thickness less than an inch, allowing a broad footprint aimed at capturing more sunlight than smaller panels. Integrated adjustable kickstands attach to the back of the segments so the array can be tilted, typically around a 45 degree angle, to optimize incidence throughout the day rather than lying flat on the ground.Hands on reviewers describe the SP037 as a five section panel that folds into a compact case and uses integrated adjustable stands to set a 45 degree angle in use.

Connections And Compatibility With Power Stations

ALLPOWERS positions the SP037 primarily as a companion panel for its large portable power stations, advertising direct compatibility with generators such as the R1500, R2500, R3500, R4000 and S2000 lines. The panel outputs via solar connectors and ships with a cable set that typically includes a solar cable to XT60 lead and adapters such as DC5525 and DC8020 to bridge into various DC inputs, meaning it can also connect to third party stations whose solar input specifications match the voltage and current window of the SP037.The manufacturer notes that the SP037 works with R1500, R2500, R3500, R4000, S2000 and S2000 Pro and ships with a solar cable to XT60 lead plus DC output adapters.

In practical use, a 400W panel at roughly 37.4V and 10.6A can charge a mid size station with a capacity around 1450Wh from low state of charge to above 80 percent in an afternoon of strong sun, which has been documented in at least one field review. That places the SP037 at the high end of portable solar add ons, providing faster replenishment than the many 100W suitcase panels often bundled with small generators, but at the cost of more weight and a larger footprint that demands space when deployed.A technical review pairing the SP037 with an R1500 station measured about 37.4V and 10.6A at a 45 degree tilt and reported charging from roughly 5 percent to 85 percent in around three hours of clear sun.

Pricing And Where It Sits In The Market

For US buyers, the SP037 400W foldable panel typically lands in the high hundreds of dollars. One long running review has listed a price point around $699.00 for the panel alone as of early 2023, which positions it above common 100-200W folding panels that usually come in around $200-400 but closer to other 300-400W portable units aimed at pairing with large lithium stations.One US based review of the ALLPOWERS 400W portable panel reported a price of $699.00 at the time of testing.

Some US focused electrical supply sites stock the panel under its SP037 designation with documented prices below that level through discounts or promotions, sometimes in the mid $500 range, illustrating that it often sells at a premium but can be found below the initial list price depending on retailer and timing. Within the sanity band for high output portable solar, that places the SP037 as a relatively expensive but capable option for power users who want more wattage out of a single folding panel rather than carrying multiple smaller units.A US electrical supplier lists the ALLPOWERS 400 Watt Foldable Solar Panel SP037 with a sale price in the mid $500 range, beneath an original price above $900.

Comparison With Smaller Portable Solar Panels

Compared with typical 100W travel panels often used with compact generators, the SP037 offers roughly four times the peak power from a single unit. For example, a common 100W folding panel might weigh under 10 lb and measure only around 40 inches by 20 inches when deployed, whereas the SP037 package weighs closer to 40 lb and unfolds beyond 100 inches in length. That weight and size make it less suited to backpacking or quick roadside setups but transform it into a more efficient charging tool for stationary camps or RV installations where higher energy demands and larger storage batteries are the norm.Within the same foldable panel lineup, ALLPOWERS highlights 100W and 200W models alongside the SP037, underlining the jump in power and physical scale at 400W.

Efficiency figures also distinguish the SP037 from generic low cost options. A conversion rate in the neighborhood of 22% places it above older polycrystalline panels at 17-19% and roughly on par with many modern mid range monocrystalline designs, meaning more usable energy per square foot in good conditions. However, larger area and higher current demand careful cable management and a power station capable of accepting the voltage and amperage safely, which is why ALLPOWERS bundles compatible XT60 and DC adapters and explicitly lists recommended generator partners.

Brand, Manufacturing And US Presence

The ALLPOWERS brand originates from a Chinese solar and portable power manufacturer specializing in portable power stations, solar panels and energy storage solutions. Company information lists Guangzhou based industrial operations and multiple research centers, while exported products are marketed globally under the ALLPOWERS name through sites and channels that include US facing web properties and distributors.Manufacturing oriented profiles describe Guangzhou Allpowers International Industrial Ltd. as a solar electronics maker producing portable panels and power stations under the ALLPOWERS brand.

For US sales and service, the brand maintains a documented entity under the ALLPOWERS INC name registered in Ontario, California, with a listed address on South Campus Avenue and a US telephone contact. That entity functions as the US branch supporting North American customers and aligns with the practice of providing domestic logistics and support for high value energy devices sold online to American consumers.Corporate contact listings identify ALLPOWERS INC at 1455 S. Campus Ave., Unit A, Ontario, CA 91761 as the US branch with a dedicated toll free number.

Use Cases, Limits And Overall Verdict

In the broader portable solar category, the ALLPOWERS SP037 400W foldable panel falls into the high output camp aimed at RV owners, van builders and home users running sizable power stations rather than casual day trip gear. Its roughly 400W peak output, about 37.4V operating voltage and 10.6A current allow substantial charging in good conditions, and the IP67 rated ETFE build and multiple adapter cables support outdoor setups and multi brand generator pairings.

The trade offs are clear: about 40 lb of weight and more than eight feet of unfolded width make handling more involved than smaller panels, and the price sits well above entry level solar suitcases. For users whose primary need is topping off a small 300-500Wh station, lighter 100-200W panels in the same line may be more practical. For those powering larger 1500-3500Wh stations, running electric coolers or tools and planning multi day off grid stays, the SP037 offers a single panel option that can deliver competitive charging rates compared to using several smaller panels, provided the space and budget are available.

Key Facts At A Glance

• Product: ALLPOWERS SP037 400W Foldable Solar Panel
• Manufacturer: ALLPOWERS INC, Ontario, CA, United States
• Category: Portable solar panel for power stations
• Peak power output: 400W rated maximum power
• Electrical characteristics: Maximum power voltage around 37.4V, maximum power current about 10.6A, open circuit voltage near 45.3V, short circuit current roughly 11.45A
• Dimensions and weight: Folded size approximately 41 inches by 21-24 inches by around 2.5 inches, with documented weight close to 40.8 lb
• Price: Around $699.00 reported for the panel alone (as of 01/08/2023)
• Target audience: RV owners, off grid campers and home users operating mid to large portable power stations