The following factors might reduce the maximum power and hence the solar panel output.
How to work out solar panel output.
Because the panels involved are not identical there is a spread in the work lines of the panels the inverter find an average working point that point is a compromise.
The stc measure the solar panel s energy output using common conditions of light exposure orientation and panel temperature.
Simply touch the solar panel leads with the multi meter probes matching their corresponding polarity red to red black to black.
You might get less than the expected solar panel output.
There s no way to increase the solar panel output and efficiency a solar panel was designed to achieve.
Attach the meter to the positive and negative terminals on the solar panel and make sure the panel is properly exposed to sunlight.
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.
Step 3 measure current.
Solar panel watts x average hours of sunlight x 75 daily watt hours as an example let s say you have 250 watt solar panels and live in a place where you get 5 hours of sunlight per day.
As long as the amp meter is rated higher than the solar panel you will be able to measure the output effectively.
Some exceptions may apply based on panel type.
What you can do is make sure that the solar panels are performing as efficiently as possible.
Solar power as a function of time in kwh or wh that your solar panel can produce taking into account its rated power and solar energy available at your place.
This solar panel output calculator helps you estimate the real daily energy a k a.
Open circuit voltage can vary depending on your solar panel but the readings we are usually looking for are in the range of 15 to 23v.