In the case of not knowing the operating mechanism of the solar inverter, some improper practices will lead to the output limitation of the solar inverter, affect the power generation income, and even affect the service life of the solar inverter. The following are several typical phenomena:
(1) Make a “protective cover” for the solar inverter
Error: Some users install a shield to protect the solar inverter, but this not only does not protect the machine, but also affects the heat dissipation of the machine. Especially in the hot summer, the installation of protective cover is easy to cause the surrounding working environment temperature is too high, resulting in the solar inverter overheating derating, output power is limited, power generation income will also be affected.
Correct: String inverters are IP65 or above and do not require additional overall protection. Therefore, we only suggest two points here: first, when the string inverter is installed, some protective roofs can be installed on its upper part to avoid direct rain; In addition, when installing multiple string inverters, pay attention to the spacing of solar inverters to ensure sufficient heat dissipation space, and perform construction as recommended in the installation manual as possible.
(2)To configure too many components, think that the more equipped, the more electricity will be generated
The configuration of the solar inverter component needs to consider its maximum output power. For example, the maximum output power of the solar inverter is set to 5.5kVA. Even if the input side inputs 6KW power, its output will not reach 6KW, only 5.5KW at most, that is to say, the output power is limited.
Considering the impact of system loss, we usually recommend different overmatching ratios for different regions. Because, if the solar inverter is overmatched too high, it will not only waste the system cost, but also make the solar inverter long time overload operation, resulting in reduced service life.
(3)Use a DC combiner box for confluence
Centralized inverters will add a combiner box on the DC side, which is mainly to connect the components of the square array in series and parallel, and add lightning protection, fuse, DC switch and other protection devices, and then unified connected to the DC cabinet side of the solar inverter.
The string inverter directly eliminates the DC combiner box, and puts Units such as the lightning protection and overcurrent protection in the machine, which greatly reduces the workload of construction and maintenance.
But some users still use centralized old thinking to configure:
Error: The number of DC terminals on the input side of the solar inverter directly determines how much power components can be configured. Some users ignore the current limit conditions on the input side, and connect the components in parallel before connecting to the solar inverter, which causes the input current to be too large and burns the fuse, and even damages the terminals, which affects the revenue of power generation.
Correct: It is necessary to fully consider the power on the input side of the solar inverter, that is, the current limit. Generally, the maximum input current of the module is about 9-10A, the double-sided module is slightly larger, and only about 11-12A, and the DC input side current of the solar inverter is mostly about 12.5A, so you need to pay special attention when configuring.
Knowing more about solar inverters can prevent similar phenomena from happening. If you have any questions about the inverter, please contact us directly.