MARBERO 21W Portable Solar Panel Foldable Solar Panel Charger IP65 Waterproof Solar Panels 23% High Efficiency Fast Charger USB Ports & DC 18V Output for Camping Outdoor Travel Emergency Cloudy
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Availability:
Only 8 left in stock, order soon!
Arrives
Tuesday, Mar 10
Size: 21W 11 x 6 x 1.3
Features
- PORTABLE, FOLDABLE & EASY TO CARRY: The MARBERO portable solar panel is compact and lightweight, with a folded size of 11.4" x 6.3" x 1.3" and weighing just 1.32 lbssmaller than an iPad Pro. It easily fits into any camping backpack or hiking daypack, or can be carried by hand, making it perfect for outdoor activities like camping, traveling, or any occasion when you need it. Designed with 4 attachment holes, this foldable solar charger can be conveniently hung anywhere using the included carabiners.
- HIGHER SOLAR CONVERSION: The 21W portable foldable solar panel is equipped with high-efficiency solar arrays, offering a conversion rate of up to 23%, turning sunlight into electrical energy for faster charging. The MARBERO 21W portable solar panel features a built-in smart chip that intelligently detects your device, maximizing charging speed while protecting it from overcharging and overloading. This ensures a more relaxed and worry-free outdoor experience without the concern of running out of power. The smart charging technology also provides optimal, 100% safe charging in direct sunlight.
- POWER IN SUN OR SHADE: This 21W portable solar panel maintains high efficiency even on cloudy days. Under full sunlight and at an optimal tilt angle (35 to 65 degrees), it generates 18W21W of power. On cloudy or overcast days, the foldable solar panel still provides 12W16W, ensuring reliable power for your devices in any weather.
- DURABLE & VERSATILE: The MARBERO portable foldable solar panel is crafted from high-quality, durable Oxford cloth and features IP65 waterproofing, dust resistance, and high-temperature durability. This portable solar charger is perfect for a wide range of outdoor activities, including camping, hiking, picnics, RV adventures, road trips, travel to remote areas, car trips, boating, power outages, and off-grid living. Its an essential piece of emergency backup gear.
- WIDE COMPATIBILITY: The USB A and DC ports are built into the power box of the MARBERO 21-watt portable foldable solar panel charger, making it perfect for charging your smartphones, tablets, laptops, power bank, speaker, portable power stations, and more. This portable solar panel, designed for camping and outdoor use, offers a reliable solar panel charging solution wherever you go, whether you're using it as a camping solar panel or for general on-the-go power needs. Our portable solar charger can't store electricity and can't charge laptops and power station.
- PACKAGE INCLUDES: 1*MARBERO Foldable Solar Panel 21W, 1*DC 5521 Cable, 3*Interchangeable DC Adapters, 1*User Manual, 2*Carabiners. NOTE: Any clouds, the angle toward sunlight, operating temperature and sunlight intensity will affect the real output, we don't suggest you use this foldable solar panel inside of a window or windscreen.
Description
Specifications:Model: SL21WWattage: 21WConversion Rate: 23% Folded Size: 6.3'' x 11.4'' 1.4''Unfolded Size: 26.8'' x 11.4'' 1.4''Weight: 1.32 lbsUSB A Outputs: 5V / 2.4ADC Output: 18V / 1.1AMaterial: Monocrystalline Silicon & Waterproof FabricOpen Circuit Voltage: 21.6V ± 5%Short Circuit Current: 1.26A ± 5%Operational Voltage: 18V ± 5% Operational Current: 1.17A ± 5% Operational Temperature: -10~70℃ / 14~158℉
Brand: MARBERO
Material: Oxford cloth
Product Dimensions: 11"L x 6"W x 1.3"H
Item Weight: 1.3 Pounds
Efficiency: 23%
Brand: MARBERO
Material: Oxford cloth
Product Dimensions: 11"L x 6"W x 1.3"H
Item Weight: 1.3 Pounds
Efficiency: 23%
Included Components: 2 Carabiners, 3 Interchangeable DC Adapters, Bag, DC 5521 Cable, User Manual
Maximum Voltage: 18 Volts (DC)
Upper Temperature Rating: 70 Degrees Celsius
Maximum Power: 21 Watts
Output Voltage: 18 Volts
Manufacturer: MARBERO
Part Number: ET-21W
Item Weight: 1.3 pounds
Item model number: ET-21W
Size: 21W 11 x 6 x 1.3
Style: Compact
Shape: Rectangle
Voltage: 18 Volts (DC)
Folded Knife Size: 11*6 INCHES
Usage: Outdoor
Batteries Included?: No
Batteries Required?: No
Warranty Description: MARBERO 21W Solar Panel will offer 12 months warranty and 7*24 customer service after your purchase. If you have any problem, please feel free to contact us.
Date First Available: September 30, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Mar 10
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Works just like it is supposed to charge, I use this to charge my portable battery when we are out camping with no electricity. Works great, I place it on the roof of the truck where it will get the most sun light.
Reviewed in the United States on January 4, 2026 by Kelly Schmidt
Charged my 88wh Marbero solar generator to 100% with less than a full day's worth of clear sunlight - took from about 10:30 AM to 4:20 PM. Comes with every adapter plug under the sun and mounting clips for your backpack. Easy to deploy, feels decently rugged, no complaints. Using the DC power plug under ideal conditions., this unit will get you days worth of phone juice before sundown. Haven't had the opportunity to test it on a cloudy day, but I doubt you'd have to do too much power rationing. USB-A charging under ideal conditions should fill a 10,000mAH battery to roughly full in the same timeframe or slightly less. Highly recommended as a bit of disaster insurance or as a camping companion.
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Reviewed in the United States on October 1, 2025 by Joseph Powell
Size: SL100
It folds up to a reasonable size, and the connections give you quick and easy options to tie it into your system. I regularly got between 70 and 90 watts, so the rating is accurate. It does not have a battery. I primarily set it up in my windshield, and it's a very good size for that purpose. It does get hot to the touch, but it's a dark product in direct sunlight so that's expected. It doesn't get hot enough to damage anything. I have had it crack ominously a few times while setting it up and taking it down so I have concerns about the rigidity and lifespan, but for now it does what I need it to.
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Reviewed in the United States on January 6, 2026 by Marvin H Hepworth III
This will be great for our power station when we go camping great size, quality and great value for your money. Looks very durable.
Reviewed in the United States on December 11, 2025 by lynn sweeney
Size: 100W 20 x 23 x 1.8
The solar panel worked really well during our camping trip. Although I had to make sure that it was in a spot where there was enough sunlight, and it wasn’t being shaded by the trees, otherwise it didn’t do enough charge to make a difference. So I did have to move it around a little bit from time to time as the sun moved, and the shade changed. But it’s really easy to set up and a great option when you have no of access to electricity. And honestly, I felt that the charging speed was surprisingly good when it was an adequate sunlight. This panel is a good value for the money.
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Reviewed in the United States on July 19, 2025 by Davina
Size: 15W 13.0 x 9.8 INCHES with 4.7 INCHES Fans
The media could not be loaded. UPDATE: Seller sent me a new one. Very nice. It was easy to set up, although it took me a while to figure out what the brackets were for. They are to connect the fans together before you put all the front plate screws in, so I did have to remove several screws and replace them after connecting the fans together. You dont need this bracket if you are using the fans separately. These fans are VERY small, yet push a lot of air. My inside run is probably too big for these, but they are perfect for inside the actual coop, where it gets really hot. The fans only works if the solar panel gets direct sunlight as there is no battery, so make sure your placement of the solar panel gets sun for most of the hottest portion of the day for optimal function. The cable length is good. MY ISSUE is only that one of the fans works. See the video. If I manipulated the cord it would start spinning, only to stop again. I could not find the "sweet spot" to keep it working. I will contact the seller and see if they can send me one fan. I have it all installed and would rather not take it down, and one fan is better than none in 100-degree heat. I will post an update on customer support. EDIT/UPDATE The seller contacted me and is more than willing to send a new fan at no cost. Very nice.
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Reviewed in the United States on June 27, 2025 by Nordix
Size: SL100
Well made portable panel that folds down to a very portable size. Testing under ideal conditions I got around 80w/100w from DC, and 45w/45w out of USB-C PD (15v 3a). A major reason I picked this panel was the mix of portability and the fact that it had decent native USB output. Legs are a little finicky but once set up the panel stays put. This panel is NOT without its flaws 1) When folded there is no snaps, nor is there a handle, nor does it come with a carry case. I would have liked a handle or something to make carrying it a little nicer, but it's not a huge issue 2) that 80w test result was in conditions that my good 100w panel gets its full 100w. If it wasn't for the fact that this panel was quite competitively priced I would have docked a star for this.
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Reviewed in the United States on July 24, 2025 by Benjamin S Benjamin S
Very portable, does charge well and has great air flow. Don’t let it get wet. This is where IT gets Weak and then goes down easy
Reviewed in the United States on January 6, 2026 by alliwant4christmas