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.

Brand	SinKeu
Material	Monocrystalline
Product Dimensions	13.78"L x 9.45"W x 1.97"H
Item Weight	3.3 Pounds
Efficiency	High Efficiency
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
AC Adapter Current	2.27 Amps
Maximum Voltage	18 Volts
Maximum Power	40 Watts
Special Feature	Water Resistant, Waterproof
UPC	616985224616
Manufacturer	SinKeu
Part Number	40W
Item Weight	3.3 pounds
Item model number	S40
Size	40W-US
Color	Black
Style	Foldable,Portable
Pattern	40W
Power Source	Corded Electric
Wattage	40 watts
Item Package Quantity	1
Folded Knife Size	13.3112in
Special Features	Water Resistant, Waterproof
Batteries Included?	No
Batteries Required?	No

Portable Solar Panel Charger 40W Foldable Solar Panel for Portable Power Station, iPhone, iPad, Laptop, Camping Solar Panels with USB QC 3.0/USB C/18V DC, Solar Panels for Camping Outdoor Van RV Trip

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