A note on solar panels
1, solar panels are the stronger the sun's light vertical irradiation intensity, the greater the output voltage, power and current.
2, the nominal rated power and current parameters are measured in the laboratory ideal light intensity conditions, the usual use is not reached, in
Under the hot sunlight at noon in summer, it can only be close to the rated power and rated current. The rated value is the value of the V.I.D. 3, no sunlight, cloudy light, indoor lighting and winter light is not strong and other environments, the solar panel output capacity is very weak.
The energy carried by these light is very small, even if it is brighter. The output voltage may also be higher under these lights, but it will be pulled down to about OV when connected to a load. And bright and can illuminate the object hot light, carrying the light energy is only high.
4, solar panel output voltage may be high when no-load, is normal, the output voltage does not have a voltage regulator, connected to the load voltage
Will be pulled down, the smaller the load impedance, the larger the current, the more the voltage is pulled down.
5, measurement of solar panel output current, you can use a multimeter tuned to DC current gear and a large number of range jack, the red pen connected to the positive terminal of the solar panel, the black pen connected to the negative terminal of the solar panel, to the direct sunlight for measurement.
6, it is recommended that the choice of solar panels, voltage parameters can match their desired voltage value or can be high, or choose a high voltage with buck module voltage regulation, power and current parameters try to use the required power and current value of about two times and more. 
7, solar panels are not batteries, do not have a storage function, there is light on the output, there is no light on the output. Can be connected to a rectifier diode at the positive output to prevent the current backflow when the light intensity is insufficient.

Material Type:Monocrystalline/PET Laminated
 
Operating voltage:5V
 
Open circuit voltage:5.8V
 
Operating current:20 0mA
 
MAX power:1W
 
Dimension:118X70mm 

Features: 
-Good low light efficiency and stable output 
-Long life waterproof, corrosion resistant and pressure resistant
-PET layer up to frosted appearance, crystal beautiful
-High conversion Excellent low light effect