In order to catch up with the last wave of 630, construction units of various projects are in full swing. However, the qualifications of construction contractors are uneven, and the level of professionalism of construction personnel will undoubtedly have a great impact on the quality of photovoltaic systems. The installation of the bracket to the inverter and the box-variable wiring all put forward high requirements for construction quality. So how to put a good quality control in the construction process? First, it is necessary to find a qualified and professional team of construction units. The second is to avoid layers of subcontracting of construction tasks as much as possible, and the third is to cooperate with suppliers such as good components and inverters.
The author previously learned about a PV power station in East China that had a negative effect on the entire photovoltaic system because of poor construction quality.
First, this plant uses a double glass assembly. Due to the fragility of glass components and unprofessional construction workers, many components are stamped and trampled in the installation process, which affects the duration of the grid connection and brings great impact to the owners. The loss, fortunately, the assembly factory technicians stationed, the professional training of construction personnel, only to avoid greater losses.
Second, the inverter to the AC combiner box wiring problem, this project uses a 40KW string inverter, a box with 1.6MW with 40 inverters, inverter to 8 into a The wire of the AC combiner box is a 3*120mm three-core coaxial cable. During the wiring, the constructor did not follow the electrical code and directly connected the three wires together as a phase, and the cable arrangement was disorderly, resulting in grid connection in the later period. At that time, serious eddy currents occurred, the cable bridge was shaken, and the inverter was frequently protected, causing a great loss of power generation to the owner.
Third, because of the 40KW machine used in this project, the front panel is designed with the upper and lower sides facing each other, and the AC side wiring is designed as an open cover connection. After the lower panel is opened, the entire cavity is exposed. Although the manufacturer claims that the machine is designed for IP65, after the wiring, the sealing of the machine and the integrity of the internal components are completely determined by the construction level and quality of the construction personnel. In the later period, it was also found that the construction of non-standard construction personnel, the panel screws were not pressed, the panel seals were broken, etc., leading to the phenomenon of influent water in individual inverters, which not only damaged the brand image of the inverter but also brought unnecessary to the owners. loss.
From the above cases, we can see that the construction quality is very important for the reliable and safe operation of photovoltaic systems. While an excellent inverter manufacturer strives to ensure product manufacturing quality, it must also pay attention to the friendly intelligence and maintenance-free design of products to minimize the impact of construction quality problems.
The SE 30KTL/SE 36KTL three-phase grid-connected photovoltaic grid-connected inverter launched by Shengnengjie Technology (Shenzhen) Co., Ltd. has made a good attempt in structural design. It adopts the integral molding of the cavity and the natural convection design. The IP65 protection class, AC side wiring for the drawer pull design, construction workers only need to pull out the wiring area, complete wiring, locking drawer ports, other electrical parts completely isolated. This design method not only well avoided the damage caused by non-standard construction, the risk of damage, but also improved the operability of the wiring, reflecting its friendly and intelligent design concept.
Photovoltaic industry as a green sunrise industry, her development is inseparable from the efforts of the photovoltaic industry, as a component supplier and inverter business need to improve the friendliness and operability of their products, and as a construction party need to manage their own construction Team, improve professional quality of construction personnel. Only if everyone forms such a joint force can green energy truly benefit millions of households.
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