SPECIFICATIONS

The ALLPOWERS 21W Foldable Solar Panel is a compact portable solar charger designed primarily for phones, small USB-powered electronics, and outdoor activities. With a lightweight foldable design and 5V USB output, it's a practical option for camping, hiking, travel, emergencies, and RV use when access to a wall outlet isn't available.

Key Features

• Rated power: 21W
• Output: 5V USB charging
• Design: Foldable and portable
• Water resistance: Advertised as waterproof
• Primary devices: Smartphones and small USB electronics
• Best uses: Camping, hiking, travel, RVs and emergency charging
• Power source: Direct sunlight

21W Solar Output ⭐⭐⭐⭐☆

A 21W rating puts this panel in the portable USB solar-charger category rather than the larger power-station category.

Under ideal sunlight, it can generate useful power for small electronics, but real-world output will fluctuate significantly based on:

• Sun intensity
• Panel angle
• Clouds
• Shade
• Temperature
• Cable losses
• Device charging requirements

Portable Foldable Design ⭐⭐⭐⭐⭐

Portability is arguably the panel's biggest strength.

The foldable construction makes it convenient to pack into:

• Backpacks
• RVs
• Camping gear
• Emergency kits
• Suitcases
• Vehicle storage

It's much more practical for mobile use than a rigid household solar panel.

Phone Charging ⭐⭐⭐⭐⭐

The panel is designed with mobile-device charging in mind.

It's suitable for replenishing compatible:

• iPhones
• Android phones
• GPS devices
• Small USB accessories
• Other USB-powered electronics

For the most consistent charging, place the panel in direct, unobstructed sunlight and keep the panel oriented toward the sun.

Clouds or partial shade can cause charging speed to drop substantially.

Outdoor Camping ⭐⭐⭐⭐⭐

The 21W format is particularly well suited to outdoor activities.

It can provide supplemental power while you're:

• Camping
• Hiking
• Backpacking
• Fishing
• Traveling
• Spending time at the beach
• Exploring off-grid locations

You can unfold the panel during daylight and connect a compatible USB device.

RV Use ⭐⭐⭐⭐½

For RV travelers, the panel can serve as a small supplemental USB charging source.

It's better suited to phones and small electronics than to directly powering large RV appliances.

For refrigerators, portable power stations, or larger battery banks, a 100W+ solar panel would generally be a more appropriate solution.

Waterproof Construction ⭐⭐⭐⭐½

The product is advertised as waterproof, which is useful for outdoor applications.

However, it's still best practice to avoid unnecessary prolonged exposure to heavy rain and to keep connectors and connected electronics protected according to the manufacturer's instructions.

"Waterproof" also doesn't mean the panel should be submerged.

Emergency Backup ⭐⭐⭐⭐½

The 21W panel can be a useful addition to an emergency kit.

During a power outage, it can provide an alternative source of energy for small USB devices as long as there's sufficient sunlight.

For emergency preparedness, pairing it with a compatible USB power bank can be even more practical: the panel can generate power during daylight while the power bank stores energy for nighttime use.

Strenghts 

• ✅ 21W rated solar output
• ✅ Compact foldable design
• ✅ 5V USB charging
• ✅ Designed for phones and small electronics
• ✅ Portable enough for hiking and camping
• ✅ Advertised waterproof construction
• ✅ Useful for RV travel
• ✅ No wall outlet required
• ✅ Good emergency backup accessory
• ✅ Easy to transport and deploy

Best Uses

Application	Rating
Smartphone charging	⭐⭐⭐⭐⭐
Camping	⭐⭐⭐⭐⭐
Hiking	⭐⭐⭐⭐⭐
Emergency kit	⭐⭐⭐⭐½
RV travel	⭐⭐⭐⭐½
GPS/electronics	⭐⭐⭐⭐⭐
Power bank charging	⭐⭐⭐⭐⭐
Large power station	⭐⭐☆☆☆
Appliances	⭐☆☆☆☆

Overall Rating

Category	Rating
Portability	⭐⭐⭐⭐⭐
Solar Output	⭐⭐⭐⭐☆
Phone Charging	⭐⭐⭐⭐⭐
Outdoor Use	⭐⭐⭐⭐⭐
Durability/Weather Resistance	⭐⭐⭐⭐½
RV Use	⭐⭐⭐⭐½
Emergency Use	⭐⭐⭐⭐½
Value	⭐⭐⭐⭐½

Overall Score: ⭐ 4.7/5

For phones and other small electronics, 21W is a useful amount of rated solar capacity.

Brand Name: ALLPOWERS

Certification: CE,FCC,RoHS,UL,pse,weee

Flexible Solar Panel: No

Foldable Solar Panel: Yes

High-concerned chemical: None

Material: SunPower solar panel

Max. Power: 21W

Model Number: AP-SP-002-BLA-NEW

Nominal Capacity: 10000mAh

Number of Cells: 1 battery and 3 solar panels

Number of Panels: 3

Size: Fold Size: 340mm x 180mm x 20mm/ 13.38x7.0x0.79inch

Type: Solar Cells

is_customized: Yes