Today, we'll be delving into the heat dissipation of C and I PV inverters. It is to help you understand the fundamental thermal design principles of our products, as well as the factors that influence derating.Our primary focus will be on the one hundred and fifty CX and one hundred and twenty five CX-P2 models across various versions.The information presented in the slides is predominantly sourced from our technical information documents and user manuals.Here is exploded Diagram. The whole inverter is divided as front compartment and back compartment. The main components related to thermal design are highlighted as red.First, let me introduce the Air Duct Design. In the front compartment, we've installed heat exchangers. This is a new addition compared to the one hundred and twenty five CX-P2 model. You can think of it as a cold tube. When the hot air comes into contact with it, the air gets cooled down.As shown in the diagram, cold air enters the heat exchanger, while hot air exits. Directly beneath the heat exchanger, there's a dedicated fan. Its purpose is to enhance the heat dissipation performance of the heat exchanger, ensuring it operates at optimal efficiency.In the front compartment, there are two exhaust fans. These fans play a crucial role in facilitating air circulation, effectively channeling and accumulating the flow of hot air. The one hundred and twenty five CX-P2 model also features two fans, but their placement differs.As you can see from the image on the right, the system is primarily divided into two main parts. The first is the inverter module, which encompasses components such as IGBTs, relays, control circuits, and protection circuits. This module is responsible for converting DC into AC.Another is the boost module consisting of seven boost transistors, because it has seven MPPTs. Boost module literally means to boost DC voltage. This is because only if the DC voltage is high enough, then can achieve DC to AC conversion.The voltage of inverter should be always a bit higher than the grid voltage. When the voltage is not high enough, the the boost module is working to lift the voltage. When the boost circuit works, it will generate more heat.The back compartment plays a pivotal role as the primary heat dissipation channel. As illustrated in the diagram, the air inlet is centrally located at the back, while the outlets are positioned at the top and bottom.When the fan at the central inlet blows in cool air, it splits into two separate streams. One stream moves upward, effectively cooling the inverter module and the inverter reactor. Meanwhile, the other stream flows downward, dissipating heat from the boost module and the boost reactor.