ALLPOWERS 400 Watt Foldable Solar Panel SP037

Details

The ALLPOWERS SP037 400W Foldable Solar Panel occupies the most practical position in the ALLPOWERS solar panel lineup: enough output to meaningfully charge a high-capacity power station during a day of outdoor use, weather-hardened enough to stay deployed through changing conditions, and portable enough to make it to the campsite, the RV roof, or the tailgate without being its own logistical challenge. At 400W peak with a 22% solar conversion rate via polycrystalline cells under ETFE lamination, it generates more usable electricity per square foot than older PET-laminated panels and maintains output in partial cloud cover, lower light angles, and cooler temperatures — conditions where cheaper panels fall off significantly.

The ETFE (ethylene tetrafluoroethylene) lamination is a meaningful upgrade over the standard PET coating found on many competing portable panels. ETFE is more UV-resistant, harder to scratch, more transmissive to the light spectrum used by solar cells, and more dimensionally stable across temperature extremes — characteristics that translate to better efficiency in hot conditions and a longer panel surface lifespan measured in years rather than months of UV exposure. Combined with the multi-layer EVA and glass fiber backing that achieves an IP67 waterproof rating, the SP037 is rated for dust immersion, rain, and brief water submersion — not just incidental splashing. Real outdoor panels get rained on, and IP67 means the SP037 handles it without degradation to the cell connections or junction box.

With an open-circuit voltage of 45.3V and a maximum power current of 10.6A, the SP037 feeds cleanly into the MPPT solar controllers on the ALLPOWERS R1500, R2500, R3500, R4000, S2000, and S2000 PRO, as well as most other brand power stations that accept MC-4 connectors and standard solar panel voltage ranges. Paired with the R2500, a single SP037 delivers up to 1,000W toward the station's solar input ceiling on its own in strong light — and a full day of 5 peak sun hours translates to approximately 1,500–2,000Wh of energy input, covering roughly 75–100% of the R2500's capacity from empty. On a trip where AC wall charging isn't available, that's the difference between a power station that lasts one day and one that sustains your camp for a long weekend. An adjustable kickstand allows angle optimization beyond 25 degrees for morning and afternoon tracking without repositioning the panel assembly.

Folded to 40.94 x 23.62 x 4.72 inches in its briefcase configuration, the SP037 fits across the backseat of most full-size pickups, stores flat in an RV compartment, or slides into the cargo area of an SUV. At 18.5kg (40.79 lbs) it's a panel for vehicle-based adventures rather than backpacking, but it's manageable for a single person to unload, position, and connect at a campsite or on a job site. FCC, CE, and ROHS certifications confirm compliance with electrical safety and environmental standards. ALLPOWERS has been designing and manufacturing portable solar solutions since 2010, and the SP037 carries that experience in its materials and construction choices. Rated 4.8 out of 5 stars by customers and compatible with the full ALLPOWERS power station ecosystem, it's the most versatile mid-range solar panel ALLPOWERS makes for users who want real output from a panel they can actually carry.

Features

• Higher Conversion Rate;
• Easy Setup & kickstand Included;
• Durable & Splash-Proof IP67;
• Foldable & Portable;