The efficiency of the solar power system is the percentage of solar energy that hits the solar panels and gets converted into the electricity. Not all of those sun rays that hit the solar panel cell would be caught and converted into the electricity, in fact most of them will be lost.

Typically, multiple solar cells are connected to make a single module which is called a panel. Each such panels are connected together to form a system. The electricity which is generated by this system is sent to the inverter so that it can be used to run your house or business.

Efficiency is dependant on various factors like the geographic region, the place where you have installed, direction, positioning and angle of installation, shades etc.

The efficiency of the solar panels are generally measured under average conditions which is called as standard test conditions. The STC measure the output power of the solar panel considering the sun rays exposure, orientation and temperature of the panel.

Typically, under STC, a 250 watts panel can produce 250 watts of power when the light exposure on the panel is 1000 watts per square meter at 25 °c. Most of the panels usually produce the efficiency of 15 to 18 percent.

Below are the few instructions that you can follow to calculate the efficiency of the solar panels

1) Calculate the surface area of the panel by multiplying the length and width of the panels.
2) Note down the power rating of the panel which is in the datasheet mentioned by the company.
3) Divide this rating by the surface area of square meters to get the solar panel efficiency.

Generally, the solar cells work better at constant and moderate temperature. With a increase in temperature there might be a damage in the solar cells and finally a shorter lifespan of your system.

Recently as the demand has increased, the technology is been improved with the drastic decrease in prices. Besides, today’s roof mounted solar systems have long lifespan with the very less maintenance.