How to test solar panel amps using a multimeter the first thing to do is place your solar panel outside in direct sunlight.
How to test a solar panel with a multimeter.
To test a 18v solar panel voltage output directly put your solar panel in direct sunlight set your multi meter to the dc volts setting.
You will want to ensure that you place the positive to positive and negative to negative when attaching your multimeter to the connection on the back of your solar panel.
Measure at higher volts than what your panel is approved for.
Tilt the solar panel in order for your solar panel to have full sunlight exposure.
As most solar panels are 12 volts the solar panel test methods are basically the same.
Make sure that you are measuring at the suitable voltage level for a solar panel.
Set multimeter to dc.