Temperature Coefficient in Photovoltaic

Why is this happening in photovoltaic modules?

Photovoltaic panels are made of crystalline silicon, therefore, the higher the temperature, the lower the efficiency. This is an inherent property of silicon. This principle also applies to the production of computers, where the fans cool the processor and motherboard to run more efficiently. In HJT combined with cristal silicon and amorphous silicon, this effect has much less impact on energy production.

The power drops as the cell voltage drops in solar panels. This is although electricity production is increasing. In fact, this increase does not compensate for voltage drops. Therefore, we have an overall power drop.

What Solar Modules Producer chooses?

Like is showing in modules ranking and technology introductions the best choice for the lowest temperature coefficient are:

• AKCOME
• Jinergy
• Risen
• Eterbright
• Jolywood

the top technology in the coefficient cases is HJT and CIGS or TOPCON.

Summary and recommendation for solar farms.

In conclusion, the temperature coefficient is a parameter needed to calculate this power loss and it usually ranges between -0.24 and 0.5% / ° C. This means that each 10 ° C of excess results in a module power drop from 2.6% to 5%.

This clearly shows that CIGS and Heterojunctions technology (plus TopCon with 0,35%/°C) have less than half-power losses compare to PERC solar modules.

In the case of small installations for domestic use, it is an important but not critical factor influencing the decision to choose a PV module. On the other hand, it is a very important factor in investments in PV farms and photovoltaic power plants on a business scale, significantly affecting the profitability of investments and subsequent profits. Therefore, for large installations from 30 kWp, it is worth choosing the Heterojunction module or TopCon modules. However, in the case of very large installations operating at high temperatures, it is even necessary.