Shielding cover, inversion equipment and inversion energy storage combined equipment

Abstract

The embodiment of the utility model provides a shielding case, inversion equipment and inversion energy storage combined equipment, the shielding case is applied to shielding an inversion module, the inversion module comprises an electromagnetic induction element, the shielding case comprises a metal shell and a metal cover, the metal shell forms an accommodating space, the inversion module is arranged in the accommodating space, and the metal cover is arranged in the accommodating space. A through hole communicated with the accommodating space is formed in the metal shell along the direction opposite to the top of the electromagnetic induction element; the metal cover is connected with the metal shell and covers the through hole, and the magnetic conductivity of the metal shell is larger than that of the metal cover. According to the arrangement, vibration and noise can be reduced, and meanwhile the requirement for electromagnetic shielding of the inductor is met.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a shielding cover, an inverter device, and an inverter-energy storage combination device. Background Technology

[0002] Electromagnetic induction components in inverter modules often require electromagnetic shielding. In related technologies, a shielding cover is set up to cover the inverter module to achieve the effect of electromagnetic shielding. However, due to the effect of the electromagnetic induction components, the shielding cover near the electromagnetic induction components will vibrate, resulting in a large amount of noise. Utility Model Content

[0003] In view of this, this application provides a shielding cover, an inverter device, and an inverter-energy storage combination device, which can reduce vibration and noise while meeting the requirements for electromagnetic shielding of inductors.

[0004] In a first aspect, one embodiment of this application provides a shielding cover applied to shield an inverter module, the inverter module including an electromagnetic induction element, the shielding cover including a metal shell and a metal cover, the metal shell forming an accommodating space, the inverter module being disposed within the accommodating space, the metal shell having a through hole communicating with the accommodating space along the direction directly opposite the top of the electromagnetic induction element; the metal cover being connected to the metal shell and covering the through hole, the permeability of the metal shell being greater than the permeability of the metal cover.

[0005] Because the coil of the electromagnetic induction element generates an alternating magnetic field when energized, the magnetism of the metal shell corresponding to the electromagnetic induction element is the strongest, resulting in the most severe vibration at that location. This application addresses this by creating a through hole on the top of the metal shell directly opposite the electromagnetic induction element and covering the through hole with a metal cover. Since the permeability of the metal shell is greater than that of the metal cover, the metal shell with higher permeability provides better electromagnetic shielding. On the other hand, since the permeability of the metal cover is lower than that of the metal shell, the metal cover, while providing electromagnetic shielding for the electromagnetic induction element, also generates less magnetism compared to the original magnetism of the metal shell. This reduces the force between the metal cover and the electromagnetic induction element, thereby reducing the attraction of the metal cover to the magnetic field generated by the highly magnetic metal shell and the coil of the electromagnetic induction element, thus reducing the vibration and noise of the shielding cover.

[0006] In at least one embodiment, the orthogonal projection of the metal cover along the covering direction completely covers the electromagnetic induction element.

[0007] In the above configuration, the metal cover can completely cover the area where the magnetic field of the electromagnetic induction element is strong, thereby minimizing the interaction force between the metal cover and the electromagnetic induction element and reducing vibration and noise.

[0008] In at least one embodiment, the shielding cover includes a mounting member located within a metal housing and configured to accommodate an electromagnetic induction element, with a metal cover connected to the mounting member.

[0009] Since the electromagnetic induction element is mounted on the mounting component, the connection between the metal cover and the mounting component helps to fix the position between the electromagnetic induction element and the metal cover. Combined with the connection between the metal cover and the metal shell, the connection stability of the metal shell, the metal cover and the electromagnetic induction element can be improved, thereby further reducing the vibration and noise of the shielding cover.

[0010] In at least one embodiment, the mounting member has a connecting post, and the shield includes a first fastener that passes through the metal cover and the connecting post to securely connect the metal cover and the mounting member.

[0011] The metal cover and the mounting piece can be detachably connected by the first fastener, which facilitates the disassembly and assembly of the electromagnetic induction element and makes it convenient for the maintenance of the electromagnetic induction element.

[0012] In at least one embodiment, the metal cover is disposed on the outside of the metal shell.

[0013] The above configuration facilitates the assembly of the metal cover from the outside of the metal shell, and the metal cover will not interfere with the electromagnetic induction element inside the metal shell.

[0014] In at least one embodiment, the shielding cover includes a second fastener, and a plurality of second fasteners are provided, each second fastener passing through the metal shell and the metal cover, the plurality of second fasteners being spaced apart circumferentially along the metal cover.

[0015] Multiple second fasteners form a fastening surface, thereby improving the connection stability between the metal shell and the metal cover to reduce the vibration and noise of the shield; and, the second fasteners enable a detachable connection between the metal cover and the metal shell, so as to facilitate the maintenance of the electromagnetic induction element located inside the metal shell.

[0016] In at least one embodiment, the metal shell is provided with a positioning post, which is disposed on the metal shell and protrudes from the outer surface of the metal shell, and the metal cover is provided with a positioning notch, with the positioning post and the positioning notch engaging in a limiting fit.

[0017] By setting positioning posts, the positioning notch of the metal cover and the limiting action of the positioning posts are used to position the metal cover during the assembly of the metal cover and the metal shell, thereby achieving rapid alignment and assembly of the metal cover and the metal shell and improving the assembly efficiency of the shielding cover.

[0018] In at least one embodiment, the hardness of the metal shell is greater than that of the metal cap.

[0019] On the one hand, the structure formed by a metal shell with high hardness is more stable. On the other hand, the hardness of the metal shell is greater than that of the metal cover. Under the same structural strength requirements, the wall thickness of the metal shell is thinner to reduce the overall volume of the shielding cover.

[0020] Secondly, embodiments of this application provide an inverter device, including an inverter module, a mounting housing, and the aforementioned shielding cover. The inverter module includes an electromagnetic induction element, which is disposed within the metal housing of the shielding cover; both the shielding cover and the inverter module are disposed within the mounting housing.

[0021] By applying the aforementioned shielding cover to the inverter equipment, the vibration and noise of the inverter equipment are reduced due to the reduction in vibration and noise of the shielding cover.

[0022] Thirdly, embodiments of this application provide an inverter energy storage combination device, including an inverter device and a battery pack; the battery pack is electrically connected to the inverter device.

[0023] By applying the aforementioned shielding cover to the inverter energy storage combination equipment, the vibration and noise of the inverter energy storage combination equipment are reduced due to the reduction of vibration and noise from the shielding cover. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0025] Figure 1 A schematic diagram of the appearance of an inverter device is provided for one embodiment of this application;

[0026] Figure 2 for Figure 1 Exploded view of the inverter equipment;

[0027] Figure 3 A schematic diagram of the shielding cover from a first perspective is provided for one embodiment of this application;

[0028] Figure 4 A schematic diagram of the structure of the metal cover of the shielding cover with an open through hole is provided in one embodiment of this application;

[0029] Figure 5 An exploded view of the first and second shells of the shielding cover is provided for one embodiment of this application;

[0030] Figure 6 An internal structural diagram of a shielding cover is provided for one embodiment of this application;

[0031] Figure 7 A second-view structural schematic diagram of a shielding cover provided according to an embodiment of this application;

[0032] Figure 8 A schematic diagram of the appearance of an inverter energy storage combination device is provided for one embodiment of this application.

[0033] Explanation of main component symbols

[0034] 100. Shielding cover; 200. Inverter equipment; 300. Inverter-energy storage combination equipment; 400. Inverter module; 401. Electromagnetic induction element; 500. Mounting housing; 600. Battery pack;

[0035] 10. Metal shell; 110. Through hole; 11. First shell; 111. Shell base plate; 12. Second shell; 120. Accommodation space;

[0036] 20. Metal cap; 210. Positioning notch;

[0037] 30. Mounting components; 31. Connecting posts;

[0038] 40. First fastener;

[0039] 50. Second fastener;

[0040] 60. Positioning post. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0043] Inverter modules include electromagnetic induction elements. Generally, a shield is used to cover the inverter module to achieve electromagnetic shielding of the electromagnetic induction elements. However, the coil current of the electromagnetic induction element is a sinusoidal alternating current. The changing current of the coil generates a changing magnetic field. Due to the changing magnetic field of the electromagnetic induction element, the shield near the electromagnetic induction element will generate changing eddy currents and form an eddy current magnetic field outside the shield. The shield is generally made of metal. Under the influence of the external magnetic field, the magnetic domains inside the metal tend to be aligned, resulting in local magnetization of the metal. The magnetized part of the metal interacts with the changing magnetic field generated by the coil of the electromagnetic induction element. That is, the metal and the electromagnetic induction element generate a continuous alternating attractive and repulsive force, which causes the metal to deform repeatedly or to collide with the electromagnetic induction element, thus generating vibration and noise.

[0044] In some embodiments, by setting a non-metallic part in the area of ​​the shield corresponding to the electromagnetic induction element, the location is not subject to the magnetization effect generated by the electromagnetic induction element when it is energized, thereby solving the noise problem caused by the vibration of the shield. However, the setting of non-metallic parts cannot meet the requirements for electromagnetic shielding of the electromagnetic induction element, affecting the electromagnetic shielding effect of the shield on the electromagnetic induction element.

[0045] An embodiment of this application provides a shielding cover for shielding an inverter module. The inverter module includes an electromagnetic induction element. The shielding cover includes a metal shell and a metal cover. The metal shell surrounds and encloses the inverter module. A through hole is provided on the top of the metal shell opposite to the electromagnetic induction element. The metal cover is connected to the metal shell and covers the through hole. The magnetic permeability of the metal shell is greater than that of the metal cover.

[0046] Understandably, since the coil of the electromagnetic induction element generates an alternating magnetic field when energized, the magnetism of the metal shell corresponding to the position of the electromagnetic induction element is the greatest, resulting in the most severe vibration at that position. This application addresses this by creating a through hole on the top of the metal shell directly opposite the electromagnetic induction element and covering the through hole with a metal cover. Because the permeability of the metal shell is greater than that of the metal cover, on the one hand, the metal shell with higher permeability has a better electromagnetic shielding effect; on the other hand, because the permeability of the metal cover is lower than that of the metal shell, while satisfying the electromagnetic shielding effect for the electromagnetic induction element, the metal cover generates lower magnetism relative to the original magnetism generated by the metal shell. This reduces the interaction force between the metal cover and the electromagnetic induction element, thereby reducing the attraction force of the metal cover to the magnetic field generated by the highly magnetic metal shell and the coil of the electromagnetic induction element, thus reducing the vibration and noise of the shielding cover.

[0047] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0048] Please see Figure 1 , Figure 2 and Figure 8 One embodiment of this application provides a shielding cover 100, an inverter device 200, and an inverter-storage combination device 300.

[0049] Among them, the inverter equipment 200 is used to convert DC and AC power; the inverter energy storage combination equipment has the functions of storing and discharging electricity, which can be used for household backup power, production unit backup power, outdoor work, outdoor entertainment, etc.

[0050] Please see Figure 2 and Figure 5In some embodiments, the inverter device 200 includes a shield 100, an inverter module 400, and a mounting housing 500. The inverter module 400 includes an electromagnetic induction element 401, which is disposed inside the shield 100. Both the shield 100 and the inverter module 400 are disposed inside the mounting housing 500.

[0051] Please see Figure 5 and Figure 8 In some embodiments, the inverter energy storage combination device 300 includes an inverter device 200 and a battery pack 600, which are electrically connected. The inverter device 200 includes a shield 100 and an inverter module 400. The inverter module 400 includes an electromagnetic induction element 401, which is disposed inside the shield 100.

[0052] For example, the inverter module 400 generally also includes electrical components such as control circuit boards and power devices to achieve the conversion of DC and AC power through the inverter module 400.

[0053] Please see Figure 3 , Figure 4 and Figure 5 In some embodiments, the shielding cover 100 includes a metal shell 10 and a metal cover 20, combined with Figure 6 As shown, the metal shell 10 forms a receiving space 120, and the inverter module 400 is disposed in the receiving space 120. Along the direction directly opposite the top of the electromagnetic induction element 401, the metal shell 10 has a through hole 110 communicating with the receiving space 120. It can be understood that since the coil of the electromagnetic induction element 401 generates an alternating magnetic field when energized, the magnetism of the metal shell 10 at the position corresponding to the electromagnetic induction element 401 is the greatest, which makes the vibration at the position of the metal shell 10 corresponding to the electromagnetic induction element 401 the most severe. This application reduces the magnetism generated by the metal shell 10 itself in the corresponding area of ​​the electromagnetic induction element 401 by opening the through hole 110 directly opposite the top of the electromagnetic induction element 401.

[0054] Furthermore, the metal cover 20 is connected to the metal shell 10, and the metal cover 20 covers the through hole 110. The magnetic permeability of the metal shell 10 is greater than that of the metal cover 20. While satisfying the electromagnetic shielding effect on the electromagnetic induction element 401, the metal cover 20 generates a lower magnetic field than the original magnetic field generated by the metal shell 10, so as to reduce the interaction force between the metal cover 20 and the electromagnetic induction element 401. This reduces the attraction force of the metal cover 20 to the highly magnetic metal shell 10 and the coil magnetic field of the electromagnetic induction element 401, thereby reducing the vibration and noise of the shielding cover 100.

[0055] The term "top" in "top of electromagnetic induction element 401" does not restrict the mounting direction of electromagnetic induction element 401, but refers to the relative direction. For example, one end of electromagnetic induction element 401 is mounted on a circuit board, and the other end is the top of electromagnetic induction element 401.

[0056] In electromagnetism, permeability reflects the degree of magnetization of a material in response to an applied magnetic field, indicating the material's response characteristics to a magnetic field. In this embodiment, the permeability of the metal shell 10 is greater than that of the metal cover 20, meaning that the metal shell 10 is magnetized to a higher degree in the same magnetic field than the metal cover 20. In other words, the metal cover 20 can weaken this magnetic field response (the degree of magnetization), thereby reducing the vibration and noise of the shielding cover 100.

[0057] Please see Figure 3 , Figure 6 and Figure 7 In some embodiments, the metal casing 10 includes a first casing 11 and a second casing 12, with a casing substrate 111 disposed between the first casing 11 and the second casing 12. The casing substrate 111 is configured to mount the electromagnetic induction element 401. The second casing 12 has the aforementioned through hole 110 and covers the electromagnetic induction element 401. The first casing 11 and the second casing 12 are respectively connected to the casing substrate 111. Some electrical components of the inverter module 400 are installed between the first casing 11 and the casing substrate 111, and other electrical components of the inverter module 400 are installed between the second casing 12 and the casing substrate 111. This results in electrical components being provided on both sides of the casing substrate 111 in the thickness direction, making the structural distribution of multiple electrical components on both sides of the casing substrate 111 in the thickness direction uniform, thereby rationally arranging multiple electrical components of the inverter module 400.

[0058] In some embodiments, the first shell 11 and the second shell 12 are detachably connected to the shell substrate 111 to facilitate the disassembly, assembly, and maintenance of the inverter module 400.

[0059] In some embodiments, the projection of the metal cover 20 along the direction of the through hole 110 completely covers the electromagnetic induction element 401, so that the metal cover 20 can completely cover the area where the magnetic field of the electromagnetic induction element 401 is strong, thereby minimizing the force between the metal cover 20 and the electromagnetic induction element 401 and reducing vibration and noise.

[0060] Please see Figure 4 and Figure 5In some embodiments, the shielding cover 100 includes a mounting member 30 located within the metal housing 10 and configured to house the electromagnetic induction element 401. A metal cover 20 is connected to the mounting member 30. Since the electromagnetic induction element 401 is mounted on the mounting member 30, the connection between the metal cover 20 and the mounting member 30 helps to fix the relative position between the electromagnetic induction element 401 and the metal cover 20. Combined with the connection between the metal cover 20 and the metal housing 10, the connection stability of the metal housing 10, the metal cover 20, and the electromagnetic induction element 401 can be improved, thereby further reducing the vibration and noise of the shielding cover 100.

[0061] Please see Figure 4 , Figure 5 and Figure 6 In some embodiments, the mounting member 30 has a connecting post 31, and the shield 100 includes a first fastener 40, which passes through the metal cover 20 and the connecting post 31 to fix the metal cover 20 and the mounting member 30 together.

[0062] When installing the electromagnetic induction element 401, the metal cover 20 is separated from the connecting post 31 of the mounting component 30. After the electromagnetic induction element 401 is installed, the metal cover 20 and the connecting post 31 of the mounting component 30 are connected by the first fastener 40. It can be seen that the metal cover 20 and the mounting component 30 can be detachably connected by the first fastener 40, which facilitates the disassembly and assembly of the electromagnetic induction element 401 and makes it convenient for the maintenance of the electromagnetic induction element 401.

[0063] For example, the first fastener 40 may be one of screws and bolts to enable a detachable connection between the mounting piece 30 and the metal cover 20.

[0064] In some embodiments, multiple first fasteners 40 and multiple connecting posts 31 are provided, and each of the multiple first fasteners 40 and each of the multiple connecting posts 31 are fixedly connected in a one-to-one correspondence; the multiple connecting posts 31 are spaced apart along the circumferential direction of the mounting member 30 to form a fastening surface, thereby improving the connection stability between the metal cover 20 and the mounting member 30.

[0065] In some embodiments, the metal cover 20 is located outside the metal housing 10 to facilitate assembly operation of the metal cover 20 from the outside of the metal housing 10, and the metal cover 20 does not interfere with the electromagnetic induction element 401 of the inverter module 400 inside the metal housing 10.

[0066] Please see Figure 4 , Figure 5 and Figure 6In some embodiments, the shielding cover 100 includes a second fastener 50, and multiple second fasteners 50 are provided. Each second fastener 50 passes through the metal shell 10 and the metal cover 20. The multiple second fasteners 50 are spaced apart along the circumference of the metal cover 20 to form a fastening surface, thereby improving the connection stability between the metal shell 10 and the metal cover 20 and reducing the vibration and noise of the shielding cover 100. In addition, the second fasteners 50 enable the metal cover 20 and the metal shell 10 to be detachably connected, so as to facilitate the maintenance of the electromagnetic induction element 401 located in the metal shell 10.

[0067] For example, the second fastener 50 is one of screws and bolts to enable a detachable connection between the metal housing 10 and the metal cover 20.

[0068] In some embodiments, the metal shell 10 is provided with a positioning post 60, which is disposed on the metal shell 10 and protrudes from the outer surface of the metal shell 10. The metal cover 20 is provided with a positioning notch 210, which is matched with the positioning post 60. By providing the positioning post 60, when assembling the metal cover 20 and the metal shell 10, the positioning notch 210 of the metal cover 20 and the positioning post 60 are matched to position the metal cover 20, thereby realizing the rapid alignment and assembly of the metal cover 20 and the metal shell 10 and improving the assembly efficiency of the shielding cover 100.

[0069] In some embodiments, the positioning post 60 is a stud, which is used to fix it to the circuit board; wherein, the circuit board may be the circuit board that comes with the inverter device 200 or the inverter energy storage combination device, or it may be the circuit board of an external device.

[0070] In some embodiments, the hardness of the metal shell 10 is greater than that of the metal cover 20. The metal shell 10 with greater hardness generally has greater strength. It is understandable that the metal shell 10 is installed over the inverter module 400, that is, the metal shell 10 has a frame structure. The frame structure with greater hardness and strength is more stable.

[0071] Understandably, since the hardness of the metal cover 20 is lower than that of the metal shell 10, in order for the structural strength of the metal cover 20 to reach the same level as that of the metal shell 10, the wall thickness of the metal cover 20 needs to be greater than that of the metal shell 10. If both the metal shell 10 and the metal cover 20 are made of materials with low hardness, the volume of the entire shielding cover 100 will be larger. Therefore, the hardness of the metal shell 10 is greater than that of the metal cover 20. Under the same structural strength requirements, the wall thickness of the metal shell 10 is thinner in order to reduce the overall volume of the shielding cover 100.

[0072] For example, the metal shell 10 is an iron shell and the metal cover 20 is an aluminum cover; wherein, the iron shell can be iron or its alloys, and the aluminum cover can be aluminum or its alloys.

[0073] For example, the iron shell can be made of SGCC (Steel Hot-dip Galvanized Coil) galvanized steel sheet; the aluminum cover can be made of AL5052 aluminum alloy.

[0074] During the manufacturing process of the shielding cover 100, it was found that aluminum metal requires a wall thickness of 1.0 mm to ensure the structural strength of the shielding cover 100, while the wall thickness of iron metal can be set to 0.6 mm. It can be seen that under the same structural strength requirements, the wall thickness of iron metal is less than that of aluminum metal, and the magnetic permeability of iron metal is higher than that of aluminum metal. By setting the metal shell 10 as an iron shell and the metal cover 20 as an aluminum cover, the aluminum cover can not only meet the electromagnetic shielding requirements of the electromagnetic induction element 401, but also reduce the generation of magnetism, so as to improve the problem of severe vibration and noise of the shielding cover 100. At the same time, the combination of iron shell and aluminum cover can reduce the overall volume of the shielding cover 100.

[0075] Furthermore, aluminum is more expensive than iron, and its salt spray resistance is inferior to that of iron. For example, in salt spray tests of AL5052 aluminum alloy and SGCC (Steel Hot-dip Galvanized Coil) galvanized steel sheet, the SGCC galvanized steel sheet showed initial corrosion after 120 hours, while under the same test conditions, the untreated AL5052 aluminum alloy typically showed initial corrosion after 72 hours. To achieve the same salt spray resistance as SGCC galvanized steel sheet, AL5052 aluminum alloy would need to undergo anodizing, which would further increase costs. Therefore, if the metal shell 10 were also made of aluminum, the cost would be high. The iron shell with an aluminum cover design in this application reduces the manufacturing cost of the shielding cover 100 to some extent.

[0076] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A shielding cover for shielding an inverter module, the inverter module including an electromagnetic induction element, characterized in that, The shielding cover includes: A metal shell forms a receiving space, and the inverter module is disposed in the receiving space. Along the direction directly opposite the top of the electromagnetic induction element, the metal shell has a through hole communicating with the receiving space. A metal cap, which is connected to and covers the through hole of the metal shell, wherein the magnetic permeability of the metal shell is greater than that of the metal cap.

2. The shielding cover according to claim 1, characterized in that, The projection of the metal cover along the direction in which the through hole is covered completely covers the electromagnetic induction element.

3. The shielding cover according to claim 1, characterized in that, The shielding cover includes: A mounting component, located within the metal housing and configured to accommodate the electromagnetic induction element, is connected to the metal cover.

4. The shielding cover according to claim 3, characterized in that, The mounting component has a connecting post, and the shielding cover includes: A first fastener passes through the metal cover and the connecting post to securely connect the metal cover and the mounting component.

5. The shielding cover according to any one of claims 1 to 4, characterized in that, The metal cover is disposed on the outside of the metal shell.

6. The shielding cover according to any one of claims 1 to 4, characterized in that, The shielding cover includes: Multiple second fasteners are provided, each of which passes through the metal shell and the metal cover, and the multiple second fasteners are spaced apart circumferentially along the metal cover.

7. The shielding cover according to any one of claims 1 to 4, characterized in that, The metal shell is provided with a positioning post, which is disposed on the metal shell and protrudes from the outer surface of the metal shell. The metal cover is provided with a positioning notch, and the positioning post and the positioning notch are matched for limiting.

8. The shielding cover according to any one of claims 1 to 4, characterized in that, The hardness of the metal shell is greater than that of the metal cap.

9. An inverter device, characterized in that, include: The shielding cover according to any one of claims 1 to 8; An inverter module includes an electromagnetic induction element, which is disposed inside the metal shell of the shielding cover; The mounting housing, the shield, and the inverter module are all housed within the mounting housing.

10. An inverter-energy storage combination device, characterized in that, include: The inverter device according to claim 9; A battery pack, which is electrically connected to the inverter.

Images