Whenever you have these two values you can figure out the wattage by multiplying them together.
Measure wattage from solar panel.
The power rating tells you how much power a solar panel was designed to produce.
The stc measure the solar panel s energy output using common conditions of light exposure orientation and panel temperature.
To begin measure solar panel amperage.
After doing your solar panel testing you should find that the solar panel output for the solar panel you built is about 21 volts and 5 amps.
You will need a solar panel tester known as an amp meter.
To make it simple remember that wattage voltage.
So under these ideal conditions a 250 watt solar panel will produce 250 watts of electricity.
Under stc a 250 watt panel produces 250 watts of electricity when the sunlight or solar irradiance on the panel is 1000 watts per square meter and the panel is operating at 25 c.
To calculate a solar panel system s power production and determine if it is sufficient for your needs you will need to measure the wattage and voltage.
It measures the wattage of a panel when it is operating at standard test conditions.
Standard test conditions is when there is a cell temperature of 77f 25c and 1 kilowatt per square meter of solar energy shining on the panel.