Alternatively the solar cell has been damaged during handling most likely during the soldering process.
How to check solar panel plates are damage or not.
If your panels face in more than one direction then split the difference.
A red or orange light during daylight hours means there s a system event or fault.
Also the problem is visible during an el test.
The volt reading on your multi meter should be close to or just under 60 volts.
If your panels face in a northerly direction from northeast through to northwest and the power output is roughly 80 of the total panel capacity then your system is probably working fine.
Then touch the multi meter s black negative lead to your solar panel s negative wire.
As you can see this defect can be easily spotted by performing a visual inspection.
Touch the multi meter s red positive lead to your solar panel s positive wire.
See how to test your solar panel for open voltage and current reading.
Results will vary depending on sun strength time of day angle of light and temperatu.
During manual soldering the solar cell breakage rate is higher than during automatic soldering.
Measure the current by following these steps.
If it s not there is a problem with your solar panel output.
Connect the red probe to the positive red lead on the solar panel.
Connect the black probe to the negative black lead on the solar panel.