Why the 40 watt solar panel can not produce desired power when charging my batteries?

This is normal, the solar panel works fine if it could produce an output power. Actually 40W is the max power of the solar chips, and 40W is a tested result in a laboratory with very strong light. The small solar panels are affected by many factors

Is the solar charger panel compatible with all power stations?

The solar panel comes with 10 DC adapters and is compatible with most portable power stations/solar generators on the market. However, I would recommend checking the input voltage range of your device to ensure it matches the 18V output solar panel.

It is recommended to charge how many watts of portable power staion?

Because the DC output is 18V/2.27A, the higher the wattage of your solar generator, the longer the charging time will be. For example: 300W=300/(18*2.27)=7 hours approx.

Can it charge multiple devices at once?

Yes, the 40W solar panel can charge multiple devices simultaneously. It has 3 output ports - 1 DC output, 1 USB-C output, and 1 USB QC3.0 output - that allow charging of different devices like phones, laptops, power banks etc. at the same time.

What's in the package?

40W Foldable Solar Panel x 1, 10-in-1 Connector x 1, DC-to-DC Cable x 1, User Manual x 1

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40W Foldable Solar Panel for iPhone, iPad, Laptop | Portable Solar Panel Charger for Portable Power Station, Camping Solar Panels for Camping Outdoor Van RV Trip

Product ID: 312363607

Details

Brand
SinKeu
Efficiency
High
Item Weight
3.3 pounds
Material
Silicon
Product Dimensions
13.78"L x x

⚡22% high conversion efficiency

📱3 versatile output ports

🔋40W max power output

€ 145.04

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Description

☀️ Power your freedom with the ultimate foldable solar charger—never miss a charge, wherever life takes you!

POWER UP ANYWHERE - 40W foldable solar panel delivers reliable energy on the go, perfect for your outdoor adventures or remote work setups.
SMART SAFE TECH - TIR-C technology intelligently optimizes charging speed while protecting your devices from overload and overcharge risks.
TRIPLE PORT CHARGING - Simultaneously power your phone, laptop, and gadgets with DC, USB-C, and QC3.0 ports—no device left behind.
LIGHTWEIGHT COMPACT - Weighing just 3.3 lbs and folding to a sleek 13.3 x 11 x 2 inches, it fits effortlessly in your backpack or RV storage.
WEATHER READY DURABILITY - Water-resistant design and easy-to-clean surface keep your panel performing strong rain or shine.

The SinKeu 40W Foldable Solar Panel is a high-efficiency, portable solar charger featuring 22% conversion efficiency and three output ports (DC, USB-C, QC3.0). Designed for outdoor enthusiasts and remote professionals, it weighs only 3.3 pounds and folds compactly for easy transport. Its water-resistant build and smart TIR-C technology ensure safe, fast charging for a wide range of devices, making it an essential companion for camping, RV trips, and off-grid power needs.

Specifications

ASIN	B08S7B46CB
Amperage Capacity	2.27 A
Best Sellers Rank	#52,989 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #251 in Solar Panels
Brand Name	SinKeu
Connector Type	USB
Customer Reviews	4.5 4.5 out of 5 stars (858)
Efficiency	High Efficiency
Folded Size	13.3112in
Included Components	40W Foldable Solar Panel x 1, 10-in-1 Connector x 1, DC-to-DC Cable x 1, User Manual x 1, Package Box x 1
Item Dimensions L x W x H	13.78"L x 9.45"W x 1.97"H
Item Type Name	foldable solar panel
Item Weight	3.3 pounds
Manufacturer	SinKeu
Manufacturer Part Number	40W
Material Type	Monocrystalline Silicon
Maximum Power	40 watts
Maximum Voltage	18 volts
Model Number	S40
Number of Items	1
Output Voltage	5 volts
Special Features	Water Resistant, Waterproof
UPC	616985224616
Unit Count	1 Count

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€ 145.04

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Finland.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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