How to improve the service life of the inverter?

发布日期:Summarize After the inverters are shipped in batches, they undergo quality inspections one after another, and their design life is almost the same. Therefore, system design, installation, and subsequent operation and maintenance are key factors. In order to improve the actual service life of the inverter, on the one hand, it is necessary to create a good operating environment for the inverter to protect it from wind, sun, and rain; on the other hand, it is necessary to conduct regular inspections to maintain the inverter’s The cooling air duct is unobstructed to avoid over-temperature derating and other failures.
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Input voltage and current parameters of the inverter

Improper matching of the inverter's input voltage and current parameters will also affect the life of the inverter. The higher the voltage or current the internal components of the inverter bear, the shorter the life of the components. Let’s take the MAX 100-125KTL3-X series inverter as an example. The input working voltage range of this series inverter is 200-1000V. If the voltage is too low, the current will be too high and close to the critical state. If the input voltage is too high, the current will decrease, but the voltage will be close to the critical state. In this case, not only the inverter’s power generation efficiency will be affected, but also the reverse Therefore, we generally recommend that the string input working voltage be configured to the rated voltage of about 600V. Considering the electrical parameter characteristics of the component under NOCT conditions, the string input working voltage is configured to about 650V, which can take into account the high efficiency of the inverter. And service life.

If the string input working voltage is configured to be around 800V, not only will the power generation efficiency be reduced, but the power devices and the current bus capacitor will be subjected to high voltage, and the life of the insulation layer will be reduced, which will affect the life of the inverter. If the string input working voltage is configured to 500V, the current will increase by 20% compared to the rated voltage. The heat of the inverter mainly comes from the current. If this is done, the heat will increase by 20%, and the temperature of the inverter will rise. Cause the service life to decrease.


In addition, although the current capacity ratio restrictions have been released in the project approval, excessive over-provisioning will cause the inverter to operate at full load for a long time, which will naturally affect the life of the inverter. For this reason, when we are designing the capacity ratio, in addition to In addition to economic factors, the life of the inverter must also be fully considered.

The external environment of inverter operation

The external environment in which the inverter operates is also an important factor affecting the life of the inverter. At present, the protection level of string inverters on the market can reach IP65 or even IP66. It is dustproof, rainproof, and has salt spray corrosion resistance. It can adapt to harsh external environments, but in places with serious pollution or dust In more places, because dirt falls on the radiator, it will affect the function of the radiator. Dust, leaves, sand and other fine objects may also enter the air duct of the inverter, which will also affect the heat dissipation and affect the service life. In this case, it is particularly important to clean up the dirt on the inverter or the cooling fan on a regular basis, so that the inverter has good heat dissipation conditions.

One end of the inverter is connected to the photovoltaic array and the other end is connected to the power grid. The power quality of the power grid will also affect the life of the inverter, especially in rural power grids where the voltage is unstable, fluctuating high and low, and the grid harmonics are high, which is easy to trigger the inverter. When the voltage exceeds the range, the inverter will stop running, and resume operation when the voltage is normal, but if it restarts frequently, the service life of the inverter will be reduced.

Summarize

After the inverters are shipped in batches, they undergo quality inspections one after another, and their design life is almost the same. Therefore, system design, installation, and subsequent operation and maintenance are key factors. In order to improve the actual service life of the inverter, on the one hand, it is necessary to create a good operating environment for the inverter to protect it from wind, sun, and rain; on the other hand, it is necessary to conduct regular inspections to maintain the inverter’s The cooling air duct is unobstructed to avoid over-temperature derating and other failures.
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