To get an accurate measurement you will need to ensure that your panel is in full sunlight when you test.
Amperage output of solar panel.
On average a domestic solar panel has a power output of around 265 watts although it can range anywhere from as little as 225 watts to more than 350 watts.
If it is proceed.
You will need a solar panel tester known as an amp meter.
5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh.
How much energy does a solar panel produce.
To begin measure solar panel amperage.
To measure amperage or voltage of solar panel you need to set the function to dc amperage or dc voltage.
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.
To measure the amp output of your solar panel you will need to attach the meter to the positive and negative.
Attach the meter to the positive and negative terminals on the solar panel and make sure the panel is properly exposed to sunlight.
A solar panel s output is expressed in watts.
Testing solar panels for volts.
Solar panel power output.
As long as the amp meter is rated higher than the solar panel you will be able to measure the output effectively.
Connect the ve solar controller output lead to the ve battery terminal.
For example if the solar panel is rated at 175 watts and the maximum power voltage vmp is given as 23 6 volts then calculate the current as 175 watts divided by 23 6 volts which is equal to 7.
When a 12v solar panel is rated at 100w that is an instantaneous rating if all of the test conditions are met when you measure the output the voltage will be about 18 volts and the current will be 5 55 amps.
Hopefully it is less than the solar panel controller output voltage.
For the sake of example if you are getting 5 hours of direct sunlight per day in a sunny state like california you can calculate your solar panel output this way.
Connect the ve solar controller output lead to one lead of your multimeter.
Measure the battery voltage.
Whenever you have these two values you can figure out the wattage by multiplying them together.
Thus the output for each solar panel in your array would.