Photovoltaic inverter cooling system introduction
Photovoltaic inverter is the core equipment of photovoltaic system. Its main function is to turn the DC power generated by photovoltaic modules into AC power that meets the requirements of power grid.
As a power electronic equipment, inverter, like all electronic products, faces the challenge brought by temperature increase. In all electronic product failure cases, up to 55% of them are caused by temperature. The electronic components inside the inverter are also very sensitive to temperature. Every 10 degree increase in temperature will halve the service life, so the heat dissipation design of the inverter is very important.
The inverter cooling system mainly includes heatsink, cooling fan, thermal grease and other materials. At present, there are two main thermal solutions of the inverter: natural cooling and forced air cooling.
Natural cooling refers to the realization of local heating devices to dissipate heat to the surrounding environment to achieve the purpose of temperature control without using any external auxiliary energy. It usually includes three main heat transfer modes: heat conduction, convection and radiation, in which natural convection is the main mode of convection.
Natural cooling is often applicable to low-power devices and components with low requirements for temperature control and low heat flux of device heating, as well as sealed or densely assembled devices that are not suitable for other cooling technologies.
Forced air cooling is mainly a method of forcing the air around the device to flow with the help of fans, so as to take away the heat emitted by the device.This method is a simple and effective heat dissipation method. If the space between components in the component is suitable for air flow or local radiator installation, this cooling method can be used as much as possible.
Increase the heat dissipation area and produce a relatively large forced convection heat transfer coefficient on the heat dissipation surface can improve the forced convection heat transfer capacity. This method has been widely used in practical engineering.
Notices during inverter installation:
1. The higher the temperature of the inverter itself, the higher the temperature will not be released in a closed space.
2. The inverter should be placed in an airy space and avoid direct sunlight as far as possible.
3. When multiple inverters are installed together, sufficient distance shall be reserved between inverters to avoid mutual influence.
