Photovoltaic grid-connected metering box

Abstract

The utility model provides a photovoltaic grid-connected metering box, which comprises a box body, the box body is composed of a plurality of side plates and a bottom plate, the box body internally comprises an incoming and outgoing line chamber, a metering chamber and a switch control chamber which are arranged from bottom to top, the side plates are provided with a plurality of heat dissipation holes, and the heat dissipation holes are respectively distributed in a first area, a second area and a third area of the side plates. A dustproof net is further arranged in the box body and at least covers the heat dissipation holes, a waterproof breathable film is further arranged on the side, back on to the interior of the box body, of the side plate, at least covers the heat dissipation holes, and the waterproof breathable film is made of expanded polytetrafluoroethylene. The metering chamber is internally provided with a photovoltaic meter, the photovoltaic meter is connected to a photovoltaic inverter arranged outside the box body, and the photovoltaic meter is also connected to a mains supply; the switch control room is provided with an isolation switch which is connected between the photovoltaic inverter and the photovoltaic meter. Based on the photovoltaic grid-connected metering box provided by the embodiment of the utility model, the grid-connected cost of a small photovoltaic system can be reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of electric power engineering, and in particular to a photovoltaic grid-connected metering box. Background Art

[0002] With the development of new energy technologies, photovoltaic power generation has become an important power generation method. The electricity generated by photovoltaic power generation generally needs to be connected to the mains through dedicated grid-connected equipment to supplement the power grid. However, traditional photovoltaic grid-connected equipment generally needs to be installed in a distribution room, which takes up a lot of space in the distribution room. When the user's distribution equipment is a bench transformer or the photovoltaic equipment is far away from the distribution room, a special distribution room needs to be built to install the photovoltaic grid-connected equipment. When the photovoltaic power generation is small, the cost of building a distribution room to install the photovoltaic grid-connected equipment is far higher than the benefits generated. The existing technology lacks a device that can provide grid-connected functions for small, decentralized photovoltaic systems at a low cost. Utility Model Content

[0003] The main purpose of the embodiment of the utility model is to provide a photovoltaic grid-connected metering box, which can reduce the cost of grid-connecting a small photovoltaic system.

[0004] The present invention provides a photovoltaic grid-connected metering box, which includes:

[0005] A box body, the box body is composed of a plurality of side panels and a bottom panel, the interior of the box body includes an inlet and outlet line chamber, a metering chamber and a switch control chamber arranged from bottom to top, the inlet and outlet line chamber, the metering chamber and the switch control chamber are respectively isolated by an isolation panel, the isolation panel is provided with a threading hole, the inner side wall of the threading hole is provided with a rubber sealing ring, the side panel is provided with a plurality of heat dissipation holes, the plurality of heat dissipation holes are respectively distributed in a first area, a second area and a third area of the side panel, the first area, the second area and the third area are respectively parts of the side panel of the box body corresponding to the inlet and outlet line chamber, the metering chamber and the switch control chamber, the aperture of the heat dissipation holes is not greater than 3 mm, the interior of the box body is further provided with a dustproof net, the dustproof net at least covers the heat dissipation holes, the side of the side panel facing away from the interior of the box body is further provided with a waterproof breathable membrane, the waterproof breathable membrane at least covers the plurality of heat dissipation holes, and the waterproof breathable membrane is formed of expanded polytetrafluoroethylene;

[0006] At least one wire outlet hole and at least one wire inlet hole are opened in the first area of the side plate, and the inner side walls of the wire outlet hole and the inner side walls of the wire inlet hole are provided with rubber sealing rings;

[0007] A photovoltaic meter is provided inside the metering chamber, and the photovoltaic meter is connected to a photovoltaic inverter provided outside the box via a cable passing through the wire hole and the wire inlet hole, and the photovoltaic meter is also connected to the mains electricity via a cable passing through the wire hole and the wire outlet hole;

[0008] The switch control room is provided with an isolating switch, and the isolating switch is connected between the photovoltaic inverter and the photovoltaic meter.

[0009] In some embodiments, a triangular top cover is provided on the top of the box body, and the bottom of the triangular top cover covers the top of the box body.

[0010] In some embodiments, the metering chamber is provided with a first door on the side facing the dial of the photovoltaic meter, the first door is provided with a meter observation window, the first door and the side panel are sealed, and a lead seal is provided at the connection between the first door and the side panel.

[0011] In some embodiments, the inlet and outlet chamber is further provided with a circuit breaker, which is connected between the photovoltaic meter and the mains.

[0012] In some embodiments, the photovoltaic meter includes a metering transformer, which is connected between the mains and the photovoltaic inverter. The incoming and outgoing line room is also provided with a measuring transformer, which is used to measure the first current output by the photovoltaic inverter and control the circuit breaker to disconnect when the first current is greater than a first current threshold. The measuring transformer is connected between the metering transformer and the photovoltaic inverter.

[0013] In some embodiments, the inlet and outlet chamber is provided with a second door, the second door is sealed to the side panel, and a lead seal is provided at the connection between the second door and the side panel. The inlet and outlet chamber is also provided with a first inner door, and the measuring transformer is fixed to the door body of the first inner door.

[0014] In some embodiments, the switch control room is provided with a third door, the third door is sealed to the side panel, and a lead seal is provided at the connection between the third door and the side panel.

[0015] In some embodiments, the side panels are constructed of an aluminum alloy.

[0016] In some embodiments, the surface of the side panel is sprayed with a hydrophobic material, and the hydrophobic material includes at least one of polyvinyl chloride, fluororubber and polycarbonate.

[0017] In some embodiments, the width of the box is no greater than 50 centimeters, the length of the box is no greater than 80 centimeters, and the height of the box is no greater than 185 centimeters.

[0018] The embodiment of the present utility model proposes a photovoltaic grid-connected metering box, which includes: a box body, the box body is composed of multiple side panels and a bottom plate, the interior of the box body includes an inlet and outlet line chamber, a metering chamber and a switch control chamber arranged from bottom to top, the inlet and outlet line chambers, the metering chamber and the switch control chamber are isolated by isolation plates, the isolation plates are provided with threading holes, the inner side walls of the threading holes are provided with rubber sealing rings, the side plates are provided with multiple heat dissipation holes, and the multiple heat dissipation holes are respectively distributed in the first area, the second area and the third area of the side plates, the first area, the second area and the third area are respectively the parts of the side plates of the box body corresponding to the inlet and outlet line chambers, the metering chamber and the switch control chamber, the aperture of the heat dissipation holes is not more than 3 mm, and the interior of the box A dustproof net is also provided, which covers at least the heat dissipation holes. A waterproof and breathable membrane is also provided on the side of the side panel facing away from the inside of the box, which covers at least the multiple heat dissipation holes. The waterproof and breathable membrane is made of expanded polytetrafluoroethylene; the bottom plate is provided with at least one wire outlet hole and at least one wire inlet hole, and the inner side walls of the wire outlet hole and the inner side walls of the wire inlet hole are provided with rubber sealing rings; a photovoltaic meter is provided inside the metering chamber, and the photovoltaic meter is connected to a photovoltaic inverter provided outside the box through a cable passing through the wire threading hole and the wire inlet hole, and the photovoltaic meter is also connected to the mains through a cable passing through the wire threading hole and the wire outlet hole; the switch control room is provided with an isolating switch, and the isolating switch is connected between the photovoltaic inverter and the photovoltaic meter. By setting the photovoltaic meter inside the box, using cables to connect the two ends of the photovoltaic meter to the mains and the photovoltaic inverter respectively, the electricity generated by the photovoltaic power generation module is measured. At the same time, heat dissipation holes are opened on the side panels of the box, a dust-proof net covering the heat dissipation holes is set inside, and a waterproof and breathable membrane made of expanded polytetrafluoroethylene is set on the side panels. As a result, the box can have good dust and water resistance and good heat dissipation performance. The photovoltaic grid-connected metering box can be deployed independently outdoors without the need to build a distribution room. Small photovoltaic systems can be connected to the grid through the photovoltaic grid-connected metering box, thereby reducing the cost required for grid connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a side structural diagram of a photovoltaic grid-connected metering box proposed in an embodiment of the present utility model;

[0020] Figure 2 This is a front view of a photovoltaic grid-connected metering box proposed in an embodiment of the present utility model;

[0021] Figure 3 This is a front view of a photovoltaic grid-connected metering box proposed in an embodiment of the present utility model;

[0022] Figure 4 This is an electrical connection diagram of a photovoltaic grid-connected metering box proposed in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and should not be understood as limiting the embodiments of the present invention.

[0024] In the description of the embodiments of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0025] In the description of the embodiments of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of the embodiments of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the embodiments of the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 The first embodiment of the present invention provides a photovoltaic grid-connected metering box, comprising:

[0028] The box body is composed of multiple side panels 110 and a bottom panel 120. The inside of the box body includes an inlet and outlet chamber 130, a metering chamber 140 and a switch control chamber 150 arranged from bottom to top. The inlet and outlet chamber 130, the metering chamber 140 and the switch control chamber 150 are separated by an isolation plate 160. The isolation plate 160 is provided with a threading hole 170. The inner wall of the threading hole 170 is provided with a rubber sealing ring. The side panel 110 is provided with multiple heat dissipation holes, which are respectively distributed on the first and second sides of the side panel 110. The first, second, and third regions are portions of the side panels 110 of the box corresponding to the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150, respectively. The diameter of the heat dissipation holes is no greater than 3 mm. A dust screen is provided inside the box, covering at least the heat dissipation holes. A waterproof breathable membrane is provided on the side of the side panel 110 facing away from the inside of the box, covering at least a plurality of heat dissipation holes. The waterproof breathable membrane is made of expanded polytetrafluoroethylene.

[0029] At least one wire outlet hole and at least one wire inlet hole are provided in the first area of the side panel 110, and rubber sealing rings are provided on the inner side walls of the wire outlet hole and the inner side walls of the wire inlet hole;

[0030] A photovoltaic meter 180 is provided inside the metering chamber 140. The photovoltaic meter 180 is connected to a photovoltaic inverter outside the box via a cable passing through the wire hole 170 and the wire inlet hole. The photovoltaic meter 180 is also connected to the mains electricity via a cable passing through the wire hole 170 and the wire outlet hole.

[0031] The switch control room 150 is provided with an isolating switch 190 , which is connected between the photovoltaic inverter and the photovoltaic meter 180 .

[0032] In one embodiment, the side panels 110 and the bottom panel 120 are connected to each other to form a rectangular box. A plurality of isolation panels 160 are provided inside the box parallel to the bottom panel 120. The edges of the isolation panels 160 are directly connected to the side panels 110 constituting the box, thereby isolating the box formed by the side panels 110 into three spaces, which are, from bottom to top, the inlet and outlet chamber 130, the metering chamber 140, and the switch control chamber 150. The inlet and outlet chamber 130 is located at the bottom of the box. In the area corresponding to the inlet and outlet chambers 130, the side panels 110 are provided with outlet holes and inlet holes. The outlet holes and inlet holes are used to allow cables to pass through the box body, thereby establishing a connection between the components inside the box and the external circuit. At the same time, the isolation plate 160 is provided with threading holes 170, so that cables can pass through the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150, thereby connecting the components inside the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150. In this embodiment, the box body of the photovoltaic grid-connected metering box is isolated into three functional chambers: the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150, thereby isolating different electrical components in different functional chambers. Each functional chamber is only responsible for the corresponding function. When a corresponding operation needs to be performed, the user only needs to operate in the corresponding functional chamber. Furthermore, by isolating the interior of the cabinet into three functional compartments, the metering, external wiring, and circuit control components are separated, preventing interference between these components. This reduces external interference with the photovoltaic meter 180 from the circuits in the incoming and outgoing wiring compartment 130 and the switching control compartment, thereby ensuring the accuracy of the photovoltaic meter 180. Furthermore, if a malfunction occurs in a functional compartment, such as excessive moisture in a compartment causing a circuit failure, this moisture can be prevented from affecting components in other compartments and potentially causing a larger electrical fault.

[0033] In one embodiment, a photovoltaic meter 180 is installed within metering chamber 140. The input of photovoltaic meter 180 is connected to a photovoltaic inverter outside the box via a cable passing through cable entry holes and cable holes 170. The output of photovoltaic meter 180 is connected to the mains electricity via a cable passing through cable holes 170 and cable exit holes. Photovoltaic meter 180 measures the electricity generated by the photovoltaic system and input into the mains electricity, thereby performing metering. Switch control chamber 150 is equipped with an isolating switch 190, which can be a knife switch. Isolating switch 190 is connected between the photovoltaic inverter and photovoltaic meter 180. The user controls whether the electricity generated by the photovoltaic system is connected to the grid by operating isolating switch 190.

[0034] In one embodiment, since the side panel 110 is provided with a wire inlet and a wire outlet, this will cause the box to be connected to the outside, and dust and water vapor outside the box can enter the inside of the box through the wire inlet and the wire outlet, reducing the dust and water proof performance of the box. Based on this, in the present disclosure, the inner side walls of the wire inlet and the wire outlet are provided with rubber sealing rings. When the cables are passed through the wire inlet and the wire outlet, they will fit tightly with the rubber sealing rings, thereby sealing the wire inlet and the wire outlet.

[0035] In one embodiment, the isolation plate 160 is provided with wire holes 170. These wire holes make it impossible to effectively isolate multiple functional rooms. Based on this, in the present disclosure, the inner wall of the wire hole 170 is provided with a rubber sealing ring. When the cable passes through the wire hole 170, it fits tightly with the rubber sealing ring, thereby sealing the wire hole 170 and ensuring that different functional rooms are isolated from each other.

[0036] In one embodiment, the side panel 110 is provided with a plurality of heat dissipation holes, which are respectively distributed in the first, second, and third regions of the side panel 110. The first, second, and third regions correspond to the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150 on the side panel 110, respectively. It is understood that the components and cables and other electrical equipment within the box generate heat during use. Since the inlet and outlet chambers 130, the metering chamber 140, and the switch control chamber 150 are isolated from each other, each chamber will generate a certain amount of heat, causing the temperature of the corresponding functional chamber to rise, which may cause damage to the components. Based on this, in the present disclosure, by providing multiple heat dissipation holes at positions corresponding to each functional chamber on the side panel 110, the heat generated within each functional chamber can be dissipated to the outside of the box through the heat dissipation holes, thereby preventing damage to the components within the box. In this embodiment, the diameter of the heat dissipation holes is no greater than 3 mm. This diameter can ensure a certain degree of heat dissipation performance while also providing a certain degree of waterproof and dustproof effect. However, when the photovoltaic grid-connected meter box needs to be placed in an open-air environment, the 3 mm aperture alone is often unable to effectively prevent dust, water vapor, and even rainwater from entering the box through the heat dissipation holes and causing failures of the photovoltaic grid-connected meter box. Based on this, in this embodiment, a dustproof net is also provided inside the box, and the dustproof net at least covers all the heat dissipation holes, thereby preventing dust from accumulating on the components inside the box. At the same time, the heat dissipation holes are covered on the outside of the side panel 110 by a waterproof and breathable membrane made of expanded polytetrafluoroethylene. The waterproof and breathable membrane can isolate water vapor in the air and has good air permeability to ensure that the photovoltaic grid-connected meter box can dissipate heat to the outside through the heat dissipation holes. As a result, the photovoltaic grid-connected meter box can have better dustproof and waterproof performance and heat dissipation performance. The photovoltaic grid-connected meter box can be directly installed outdoors. At this time, the photovoltaic grid-connected meter box is directly installed near a dispersed small photovoltaic system without the need to build a distribution room, thereby reducing the cost of grid-connecting the small photovoltaic system.

[0037] Reference Figure 1 In one embodiment, a triangular top cover 210 is provided on the top of the box, and the bottom of the triangular top cover 210 covers the top of the box. In this embodiment, by providing the triangular top cover 210 on the top of the box, rainwater or other forms of water falling from above the box can flow down along the top cover, and will not remain on the top of the box to form water accumulation and corrode the box. In some embodiments, the bottom area of the triangular top cover 210 is larger than the area of the top of the box. After the triangular top cover 210 is fixed to the top of the box, the edge of the bottom of the triangular top cover 210 does not contact the top of the box. In this way, when rainwater or other water flows fall from the triangular top cover 210, they will not flow to the ground along the surface of the side panel 110.

[0038] Reference Figures 1 to 3 In some embodiments, the metering chamber 140 is provided with a first door 310 on the side facing the dial of the photovoltaic meter 180. The first door 310 is provided with a meter observation window 320. The first door 310 is sealed to the side panel 110, and a lead seal is provided at the connection between the first door 310 and the side panel 110. It is understood that in this case, the side panel 110 and the first door 310 are sealed together to form the metering chamber 140. The first door 310 is provided on the side facing the dial of the photovoltaic meter 180 and is provided with a meter observation window 320. It is understood that the meter observation window 320 is made of a transparent material, allowing a user to directly observe the data on the dial of the photovoltaic meter 180 in the metering chamber 140 through the meter observation window 320 from outside the chamber. It is understood that a rubber sealing strip may be provided at the connection between the side panel 110 and the first door 310 to ensure a sealed connection between the first door 310 and the side panel 110 when closed. One side of the first door 310 may be connected to the side panel 110 via a hinge, and the other side may be fixed to the side panel 110 via a lead seal. In this way, if a meter malfunctions, the user can remove the lead seal to open the first door 310 and inspect the photovoltaic meter 180. Furthermore, the user can determine whether the data in the photovoltaic meter 180 has been tampered with by checking whether the lead seal is broken.

[0039] Reference Figure 1 In some embodiments, a circuit breaker 410 is provided in the inlet and outlet chamber 130. The circuit breaker 410 is connected between the photovoltaic meter 180 and the mains power. Specifically, it can be a molded case circuit breaker 410. When the current output to the mains power is abnormal, it indicates that the internal circuit of the photovoltaic grid-connected meter box is short-circuited. At this time, the circuit breaker 410 is disconnected to disconnect the circuit and avoid electric shock accidents.

[0040] Reference Figure 1In some embodiments, the photovoltaic meter 180 includes a metering transformer. The photovoltaic meter 180 includes a metering transformer, which is connected between the mains and the photovoltaic inverter. The incoming and outgoing line chamber 130 is also provided with a measuring transformer 510. The measuring transformer 510 is used to measure the first current output by the photovoltaic inverter and control the circuit breaker 410 to disconnect when the first current is greater than the first current threshold. The measuring transformer 510 is connected between the metering transformer and the photovoltaic inverter. It is understandable that the metering transformer and the measuring transformer 510 are both current transformers. The metering transformer is used to measure the electrical energy input to the mains, while the measuring transformer 510 is used to measure the current output by the photovoltaic inverter and control the circuit breaker 410 to disconnect when the current is too large to prevent circuit damage caused by excessive current.

[0041] Reference Figure 1 In some embodiments, the inlet / outlet compartment 130 is provided with a second door 610, which is sealed to the side panel 110. A lead seal is provided at the connection between the second door 610 and the side panel 110. The inlet / outlet compartment 130 is further provided with a first inner door 620, and the measuring transformer 510 is fixed to the door body of the first inner door 620. Thus, a user can inspect the circuit breaker 410 and the measuring transformer 510 in the inlet / outlet compartment 130 by opening the second door 610.

[0042] Reference Figure 1 In some embodiments, the switch control room 150 is provided with a third door 710. The third door 710 is sealed to the side panel 110, and a lead seal is provided at the connection between the third door 710 and the side panel 110. By providing the third door 710, when a user needs to disconnect the photovoltaic inverter from the mains, they can directly open the third door 710 and operate the isolating switch 190 in the switch control room 150 to disconnect the photovoltaic inverter from the mains and stop grid connection. Alternatively, when the photovoltaic grid-connected meter box needs to be repaired and maintained, the third door 710 can be opened and the isolating switch 190 can be disconnected to disconnect the photovoltaic grid-connected meter box circuit, ensuring the safety of maintenance personnel. Furthermore, by providing a lead seal at the connection between the third door 710 and the side panel 110, it is possible to determine whether the switch control room 150 has been forcibly opened by others.

[0043] In some embodiments, the side panels 110 are made of aluminum alloy. Since aluminum alloy has a high heat dissipation coefficient, the box can utilize the heat dissipation capacity of the aluminum alloy material itself to dissipate part of the heat inside the box.

[0044] In some embodiments, the surface of side panel 110 is coated with a hydrophobic material, which includes at least one of polyvinyl chloride, fluororubber, and polycarbonate. By coating the surface of side panel 110 with the hydrophobic material, the hydrophobic properties of the material are utilized to repel water molecules in the air, thereby improving the waterproof performance of side panel 110 and preventing water vapor from corroding side panel 110.

[0045] In some embodiments, the box has a width of no greater than 50 centimeters, a length of no greater than 80 centimeters, and a height of no greater than 185 centimeters. Thus, the box occupies a small area and can be conveniently deployed near a photovoltaic system without occupying excessive land. Furthermore, the box is relatively low in height, allowing for easy opening of the door to install, replace, or repair components within the box during installation or maintenance of the photovoltaic grid-connected metering box.

[0046] The embodiments described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are also applicable to similar technical problems.

[0047] It will be understood by those skilled in the art that Figures 1 to 4 The technical solutions shown in the figures do not constitute a limitation on the embodiments of the present invention, and may include more or fewer components than shown in the figures, or combine certain components, or different components.

[0048] The terms "first," "second," "third," "fourth," and so on (if any) in the specification of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can be implemented in orders other than those illustrated or described herein.

[0049] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A photovoltaic grid-connected metering box, characterized in that: The photovoltaic grid-connected metering box includes: A box body, the box body is composed of a plurality of side panels and a bottom panel, the interior of the box body includes an inlet and outlet line chamber, a metering chamber and a switch control chamber arranged from bottom to top, the inlet and outlet line chamber, the metering chamber and the switch control chamber are respectively isolated by an isolation panel, the isolation panel is provided with a threading hole, the inner side wall of the threading hole is provided with a rubber sealing ring, the side panel is provided with a plurality of heat dissipation holes, the plurality of heat dissipation holes are respectively distributed in a first area, a second area and a third area of the side panel, the first area, the second area and the third area are respectively parts of the side panel of the box body corresponding to the inlet and outlet line chamber, the metering chamber and the switch control chamber, the aperture of the heat dissipation holes is not greater than 3 mm, the interior of the box body is further provided with a dustproof net, the dustproof net at least covers the heat dissipation holes, the side of the side panel facing away from the interior of the box body is further provided with a waterproof breathable membrane, the waterproof breathable membrane at least covers the plurality of heat dissipation holes, and the waterproof breathable membrane is formed of expanded polytetrafluoroethylene; At least one wire outlet hole and at least one wire inlet hole are opened in the first area of the side plate, and the inner side walls of the wire outlet hole and the inner side walls of the wire inlet hole are provided with rubber sealing rings; A photovoltaic meter is provided inside the metering chamber, and the photovoltaic meter is connected to a photovoltaic inverter provided outside the box via a cable passing through the wire hole and the wire inlet hole, and the photovoltaic meter is also connected to the mains electricity via a cable passing through the wire hole and the wire outlet hole; The switch control room is provided with an isolating switch, and the isolating switch is connected between the photovoltaic inverter and the photovoltaic meter.

2. The photovoltaic grid-connected metering box according to claim 1, characterized in that: A triangular top cover is provided on the top of the box body, and the bottom of the triangular top cover covers the top of the box body.

3. The photovoltaic grid-connected metering box according to claim 1, characterized in that: The metering chamber is provided with a first door on the side facing the dial of the photovoltaic meter, the first door is provided with a meter observation window, the first door and the side panel are sealed, and a lead seal is provided at the connection between the first door and the side panel.

4. The photovoltaic grid-connected metering box according to claim 1, characterized in that: The inlet and outlet chamber is also provided with a circuit breaker, which is connected between the photovoltaic meter and the mains.

5. The photovoltaic grid-connected metering box according to claim 4, characterized in that: The photovoltaic meter includes a metering transformer, which is connected between the mains and the photovoltaic inverter. The incoming and outgoing line room is also provided with a measuring transformer, which is used to measure the first current output by the photovoltaic inverter and control the circuit breaker to disconnect when the first current is greater than a first current threshold. The measuring transformer is connected between the metering transformer and the photovoltaic inverter.

6. The photovoltaic grid-connected metering box according to claim 5, characterized in that: The inlet and outlet line chamber is provided with a second door, the second door is sealed and connected to the side panel, and a lead seal is provided at the connection between the second door and the side panel. The inlet and outlet line chamber is also provided with a first inner door, and the measuring transformer is fixed to the door body of the first inner door.

7. The photovoltaic grid-connected metering box according to claim 1, characterized in that: The switch control room is provided with a third door, the third door is sealed and connected to the side panel, and a lead seal is provided at the connection between the third door and the side panel.

8. The photovoltaic grid-connected metering box according to claim 1, characterized in that: The side panels are made of aluminum alloy.

9. The photovoltaic grid-connected metering box according to claim 1, characterized in that: The width of the box is not greater than 50 centimeters, the length of the box is not greater than 80 centimeters, and the height of the box is not greater than 185 centimeters.

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