PV Gap

Sonia Said:

How do you calculate the efficiency of solar cells?

We Answered:

Energy efficiency is always power out divided by power in.

In the case of solar cells, it is the watts of electrical energy produced by the cells divided by the watts of electromagnetic energy striking the solar panels.

Gladys Said:

why does temperature decrease efficiency of solar cells?

We Answered:

Overall resistivity of the entire circuit rises with internal temperature, despite the fact that the semiconductors in the circuit become more conductive with temperature rise.

Marian Said:

How can we measure efficiency of solar cells?

We Answered:

You need to know the amount of energy available to the surface of the solar cell. This can be measured or estimated. Here are several sites that talk about solar radiation. There are many others if you choose to look for them;