Electric work machine

Abstract

To provide an electric work machine that can maintain good machine body balance during work even when a large-capacity (large) battery unit is used.SOLUTION: A hydraulic excavator as an electric work machine includes a lower traveling body, an upper rotating body located above the lower traveling body and rotatable relative to the lower traveling body, an electric motor disposed on the upper rotating body, a battery unit disposed on the upper rotating body and storing power for driving the electric motor, and a junction box for relaying power supplied from the battery unit to the electric motor. The upper rotating body has a rotating frame at its bottom. The battery unit is disposed on the rotating frame below a driver's seat. The junction box is disposed above the battery unit.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electric work machine. [Background technology]

[0002] BACKGROUND ART Conventionally, a hydraulic excavator has been proposed in which a hydraulic pump is driven by an electric motor, and hydraulic oil is supplied from the hydraulic pump to a hydraulic actuator to drive the hydraulic actuator (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-211394 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the battery for driving the electric motor is located at the rear end of the upper rotating body. The battery is located higher on the upper rotating body than the electric motor and the hydraulic pump. With this arrangement, the heavy battery is located higher, raising the center of gravity of the hydraulic excavator. As a result, it becomes difficult to maintain good balance of the hydraulic excavator when driving the hydraulic actuator to perform work. In particular, when using a large-capacity battery (for example, a battery unit in which multiple batteries are integrated), if the battery unit is located high on the upper rotating body, or if the battery unit is positioned off-center in the left-right direction, it becomes even more difficult to maintain good balance of the machine.

[0005] The present invention has been made to solve the above problems, and its object is to provide an electric work machine that can maintain good machine balance during work even when a large-capacity (large) battery unit is used. [Means for solving the problem]

[0006] An electric work machine according to one aspect of the present invention comprises a lower running body, an upper rotating body located above the lower running body and rotatable relative to the lower running body, an electric motor arranged on the upper rotating body, a battery unit arranged on the upper rotating body and storing power for driving the electric motor, and a junction box relaying power supplied from the battery unit to the electric motor, wherein the upper rotating body has a rotating frame at its bottom, the battery unit is arranged on the rotating frame below the driver's seat, and the junction box is arranged above the battery unit. [Effects of the Invention]

[0007] Even when using a large-capacity (large) battery unit, the aircraft can maintain good balance during operation. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a schematic configuration of a hydraulic excavator, which is an example of an electric work machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram schematically showing the configuration of a control system and a hydraulic system of the hydraulic excavator. [Figure 3] FIG. 2 is a plan view schematically showing the arrangement of components in an engine room of an upper rotating body of the hydraulic excavator. [Figure 4] FIG. 2 is a perspective view schematically showing the arrangement of components in the engine room. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes an embodiment of the present invention with reference to the drawings.

[0010] [1. Electric working machines] 1 is a side view showing a schematic configuration of a hydraulic excavator (electric excavator) 1, which is an example of an electric work machine according to this embodiment. The hydraulic excavator 1 includes a lower traveling body 2, a work implement 3, and an upper rotating body 4.

[0011] Here, directions are defined as follows: The direction in which the operator (pilot, driver) seated in the driver's seat 41a of the upper rotating body 4 faces is defined as the forward direction, and the opposite direction is defined as the rearward direction. Therefore, when the upper rotating body 4 is not rotating relative to the undercarriage 2 (swing angle 0°), the fore-and-aft direction of the upper rotating body 4 coincides with the direction in which the undercarriage 2 moves forward and backward. Also, the left side as seen from the operator seated in the driver's seat 41a is defined as the "left," and the right side is defined as the "right." Furthermore, the direction of gravity, which is perpendicular to the fore-and-aft and left-and-right directions, is defined as the up-and-down direction, with the upstream side of the direction of gravity defined as the "up" and the downstream side as the "down." In the drawings, the upper rotating body 4 is shown in a non-swinging state relative to the undercarriage 2, and as necessary, the forward direction is indicated by the symbols "F," "rearward" by the symbol "B," "right" by the symbol "R," "left" by the symbol "L," "up" by the symbol "U," and "down" by the symbol "D."

[0012] The lower traveling structure 2 is equipped with a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, to move the hydraulic excavator 1 forward and backward. The lower traveling structure 2 is provided with a blade 23 for performing ground leveling work and a blade cylinder 23a. The blade cylinder 23a is a hydraulic cylinder that rotates the blade 23 up and down.

[0013] The work implement 3 includes a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, the arm 32, and the bucket 33, it is possible to perform work of excavating earth and sand, etc.

[0014] The boom 31 is rotated by a boom cylinder 31a. The base end of the boom cylinder 31a is supported on the front part of the upper rotating body 4 and is movable so as to be telescopic. The arm 32 is rotated by an arm cylinder 32a. The base end of the arm cylinder 32a is supported on the tip part of the boom 31 and is movable so as to be telescopic. The bucket 33 is rotated by a bucket cylinder 33a. The base end of the bucket cylinder 33a is supported on the tip part of the arm 32 and is movable so as to be telescopic. The boom cylinder 31a, arm cylinder 32a, and bucket cylinder 33a are constituted by hydraulic cylinders.

[0015] The upper rotating body 4 is located above the lower traveling body 2 and is provided so as to be able to rotate relative to the lower traveling body 2 via a rotation bearing (not shown). A control unit 41, a rotation frame 42, a rotation motor 43, an engine room 44, etc. are arranged on the upper rotating body 4. The upper rotating body 4 rotates via the rotation bearing when driven by the rotation motor 43, which is a hydraulic motor.

[0016] A hydraulic pump 71 (see FIG. 2) is disposed on the upper rotating body 4. The hydraulic pump 71 is driven by an electric motor 61 (see FIG. 2) inside the engine room 44. The hydraulic pump 71 supplies working oil (pressurized oil) to hydraulic motors (e.g., left and right travel motors 22, swing motor 43) and hydraulic cylinders (e.g., blade cylinder 23a, boom cylinder 31a, arm cylinder 32a, bucket cylinder 33a). The hydraulic motors and hydraulic cylinders that are driven by the supply of working oil from the hydraulic pump 71 are collectively referred to as hydraulic actuators 73 (see FIG. 2).

[0017] A driver's seat 41a is disposed in the control section 41. Various levers 41b are disposed around the driver's seat 41a. When an operator sits on the driver's seat 41a and operates the levers 41b, the hydraulic actuator 73 is driven. This allows the lower traveling body 2 to travel, the blade 23 to perform ground leveling work, the work implement 3 to perform excavation work, the upper rotating body 4 to rotate, and so on.

[0018] A battery unit 53 (e.g., a lithium-ion battery unit) is disposed on the upper rotating body 4. The battery unit 53 stores power for driving the electric motor 61. The battery unit 53 may be configured by combining multiple batteries into a unit, or may be configured by a single battery cell. The upper rotating body 4 is also provided with a power supply port (not shown). The power supply port is connected to a commercial power source 51, which is an external power source, via a power supply cable 52. This allows the battery unit 53 to be charged.

[0019] The upper revolving body 4 is further provided with a lead battery 54. The lead battery 54 outputs a low-voltage (e.g., 12 V) DC voltage. The output from the lead battery 54 is supplied as a control voltage to, for example, a blower fan F (see FIG. 3) and a system controller 67 (see FIG. 2), which will be described later.

[0020] The hydraulic excavator 1 may be configured to use a combination of hydraulic equipment such as the hydraulic actuator 73 and an actuator driven by electricity. Examples of the actuator driven by electricity include an electric travel motor, an electric cylinder, and an electric swing motor.

[0021] [2. Control and hydraulic system configuration] 2 is a block diagram showing a schematic configuration of the control system and hydraulic system of the hydraulic excavator 1. The hydraulic excavator 1 includes an electric motor 61, a charger 62, an inverter 63, a PDU (Power Drive Unit) 64, a junction box 65, a DC-DC converter 66, and a system controller 67. The system controller 67 is configured as an electronic control unit also known as an ECU (Electronic Control Unit), and performs electrical control of each part of the hydraulic excavator 1.

[0022] The electric motor 61 is driven by electric power supplied from the battery unit 53 via a junction box 65 and an inverter 63. The electric motor 61 is configured as a permanent magnet motor or an induction motor.

[0023] The charger 62 converts the AC voltage supplied from the commercial power supply 51 shown in FIG. 1 via the power supply cable 52 into a DC voltage. The inverter 63 converts the DC voltage supplied from the battery unit 53 into an AC voltage and supplies it to the electric motor 61. This causes the electric motor 61 to rotate. The supply of the AC voltage (current) from the inverter 63 to the electric motor 61 is performed based on a rotation command output from a system controller 67.

[0024] The PDU 64 is a battery control unit that controls an internal battery relay to control input and output of the battery unit 53. The junction box 65 includes a charger relay, an inverter relay, a fuse, etc. The voltage output from the charger 62 is supplied to the battery unit 53 via the junction box 65. The voltage output from the battery unit 53 is also supplied to the inverter 63 via the junction box 65.

[0025] The DC-DC converter 66 reduces the high voltage (e.g., 300 V) DC voltage supplied from the battery unit 53 to a low voltage (e.g., 12 V). The voltage output from the DC-DC converter 66 is supplied to the blower fan F, the system controller 67, etc., in the same manner as the output from the lead battery 54.

[0026] A plurality of hydraulic pumps 71 are connected to the rotary shaft (output shaft) of the electric motor 61. The plurality of hydraulic pumps 71 include variable displacement pumps and fixed displacement pumps. In FIG. 2, only one hydraulic pump 71 is shown as an example. Each hydraulic pump 71 is connected to a hydraulic oil tank 74 that stores hydraulic oil. The hydraulic pump 71 supplies hydraulic oil in the hydraulic oil tank 74 to a hydraulic actuator 73 via a control valve 72. This drives the hydraulic actuator 73. The control valve 72 is a directional switching valve that controls the flow direction and flow rate of the hydraulic oil supplied to the hydraulic actuator 73.

[0027] As described above, the hydraulic excavator 1 of this embodiment includes at least the electric motor 61, the hydraulic pump 71, and the battery unit 53, which are arranged on the upper rotating body 4 (see FIG. 1). The hydraulic excavator 1 also includes the hydraulic actuator 73 that is driven by the supply of hydraulic oil from the hydraulic pump 71.

[0028] [3. Layout of components inside the engine room] 3 and 4 are a plan view and a perspective view, respectively, that schematically show the arrangement of each component in the engine room 44 of the upper rotating body 4. Note that for simplicity, each component is shown as a simple rectangular parallelepiped or cylindrical shape in FIGS. 3 and 4, but the actual shape may differ from these. Also, FIGS. 3 and 4 omit the illustration of a seat mount. The seat mount constitutes the upper wall of the engine room 44 and is a base that forms the base of the driver's seat 41a shown in FIG. 1. Also, for convenience, FIG. 4 omits the illustration of the blower fan F and heat exchanger HE shown in FIG. 3.

[0029] The upper rotating body 4 has a rotating frame 42 at its bottom. The rotating frame 42 constitutes the bottom plate of the upper rotating body 4. The battery unit 53 described above is disposed on the rotating frame 42. The electric motor 61 and hydraulic pump 71 described above are also disposed on the rotating frame 42 (shifted from the battery unit 53). In particular, the electric motor 61 and hydraulic pump 71 are disposed side by side in the left-right direction of the upper rotating body 4 on the rotating frame 42.

[0030] More specifically, the battery unit 53 is disposed on the left side on the revolving frame 42. Meanwhile, the electric motor 61 and the hydraulic pump 71 are disposed on the right side of the battery unit 53 and are disposed side by side in the left-right direction. In other words, on the revolving frame 42, the battery unit 53 is disposed on one side in the left-right direction, and the electric motor 61 and the hydraulic pump 71 are disposed on the other side in the left-right direction relative to the battery unit 53. The output shaft of the electric motor 61 and the input shaft of the hydraulic pump 71 are positioned along the left-right direction.

[0031] Note that there are support structures such as vibration-damping rubber, stays, and housings between the battery unit 53, electric motor 61, and hydraulic pump 71 and the rotating frame 42, but these support structures are not shown in the drawings.

[0032] By arranging the electric motor 61, hydraulic pump 71 and battery unit 53 on the same rotating frame 42, the center of gravity of the hydraulic excavator 1 can be lowered compared to a configuration in which the battery unit 53 is arranged above the electric motor 61, even when a large (large-capacity) battery unit 53 is used.

[0033] Furthermore, by arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction on the revolving frame 42, it is possible to achieve a weight balance in the left-right direction. More specifically, if the battery unit 53 is increased in size (capacity), the weight of the battery unit 53 becomes greater than the weight of the electric motor 61 alone and the weight of the hydraulic pump 71 alone. However, it is possible to make the total weight of the electric motor 61 and the hydraulic pump 71 close to the weight of the battery unit 53. Therefore, when the battery unit 53 is positioned to the left of the center on the revolving frame 42 as described above, it is possible to achieve a weight balance between the left and right sides of the revolving frame 42 by arranging the electric motor 61 and the hydraulic pump 71 side by side (side by side in the left-right direction) to the side (for example, on the right side) of the battery unit 53.

[0034] In this way, even when a large-capacity (large) battery unit 53 is used, the center of gravity of the hydraulic excavator 1 can be kept low and the weight can be balanced between the left and right sides. Therefore, even when work is performed by driving the hydraulic actuator 73, the body balance of the hydraulic excavator 1 can be maintained well, and work can be performed well with the hydraulic excavator 1 in a stable posture.

[0035] Furthermore, by arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction on the revolving frame 42, even when a large battery unit 53 is used, the electric motor 61, the hydraulic pump 71, and the battery unit 53 can be efficiently arranged together in a limited space on the revolving frame 42 (for example, rearward on the revolving frame 42 as shown in FIG. 3 ). As a result, even when a large battery unit 53 is used, it is possible to avoid an increase in the size of the revolving frame 42 as much as possible, and therefore an increase in the size of the hydraulic excavator 1 as well.

[0036] Note that the electric motor 61 and the hydraulic pump 71 may be arranged in front of the battery unit 53 on the rotating frame 42. Even in this case, it is possible to achieve a balanced weight in the left-right direction by, for example, arranging the battery unit 53 in the center in the left-right direction and arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction so that the total center of gravity of the electric motor 61 and the hydraulic pump 71 is in the center in the left-right direction. As a result, similar to the above, it is possible to maintain good machine balance of the hydraulic excavator 1 during work.

[0037] In particular, in a configuration like this embodiment in which the battery unit 53 is disposed on one side in the left-right direction on the revolving frame 42 and the electric motor 61 and hydraulic pump 71 are disposed on the other side in the left-right direction, arranging the electric motor 61 and the hydraulic pump 71 side by side in the left-right direction makes it easier to achieve a left-right weight balance on the revolving frame 42. Therefore, a configuration in which the electric motor 61 and the hydraulic pump 71 are disposed side by side in the left-right direction is very effective.

[0038] 1, if the operator's seat 41a where the operator sits is located, for example, forward of the battery unit 53, it becomes necessary to form the revolving frame 42 long in the front-to-rear direction in order to position the operator's seat 41a and the battery unit 53, which are aligned in the front-to-rear direction, on the same revolving frame 42. This leads to an increase in the size of the hydraulic excavator 1.

[0039] In this regard, in this embodiment, as shown in Fig. 1, the operator's seat 41a is located above the battery unit 53. In this configuration, the operator's seat 41a and the battery unit 53 are positioned so as to overlap each other when viewed from above, which makes it possible to shorten the length of the rotating frame 42 in the front-to-rear direction. As a result, the hydraulic excavator 1 can be made more compact.

[0040] [4. Placement of electrical equipment] The charger 62, inverter 63, PDU 64, and DC-DC converter 66 are examples of electrical equipment EC. The electrical equipment EC is disposed in the engine room 44 together with the electric motor 61, hydraulic pump 71, and battery unit 53. The engine room 44 has the above-mentioned rotating frame 42 at its bottom. That is, the rotating frame 42 is the bottom of the upper rotating body 4 and also the bottom of the engine room 44.

[0041] As shown in FIG. 3, a blower fan F is disposed on the side of the engine room 44. The blower fan F circulates air between the inside and outside of the engine room 44. The blower fan F is disposed inside a bonnet 44a that covers the side of the engine room 44. The blower fan F is configured, for example, as an exhaust fan that exhausts air inside the engine room 44 to the outside, but it may also be an intake fan that takes air outside the engine room 44 into the inside. In other words, the blower fan F may be of either an exhaust type or an intake type.

[0042] A heat exchanger HE is disposed on the revolving frame 42 at a position facing the blower fan F. The heat exchanger HE includes a radiator that exchanges heat with the cooling medium and an oil cooler that exchanges heat with the hydraulic oil. The air generated by driving the blower fan F is directed at the heat exchanger HE, whereby the cooling medium and the hydraulic oil are cooled through heat exchange. In this embodiment, the cooling medium is supplied to the battery unit 53. That is, the battery unit 53 is water-cooled. The electric motor 61, the charger 62, the inverter 63, the PDU 64, and the DC-DC converter 66 are air-cooled.

[0043] In this embodiment, the blower fan F and the electrical equipment EC are located on the right side of the battery unit 53. In other words, the blower fan F and the electrical equipment EC are located on the same side of the battery unit 53 in the left-right direction as the electric motor 61 and the hydraulic pump 71.

[0044] In this configuration, an air flow can be created by driving the blower fan F, for example, on the right side of the battery unit 53 in the engine room 44. The air flowing by driving the blower fan F can then be directed at the electrical equipment EC arranged on the right side of the battery unit 53, thereby cooling the electrical equipment EC. Therefore, even if the battery unit 53 is large, it is possible to cool the electrical equipment EC.

[0045] 3, the revolving frame 42 has an opening 42P that communicates with the interior of the engine room 44. The position where the opening 42P is formed in the revolving frame 42 is not particularly limited, but for example, the opening 42P is formed in the revolving frame 42 at a position below the hydraulic pump 71.

[0046] In this configuration, when the blower fan F is driven, air is drawn into the engine room 44 from below the engine room 44 through the opening 42P, and the drawn-in air can be discharged to the outside of the engine room 44 from the side of the engine room 44 via the blower fan F. This air flow can efficiently cool the electrical equipment EC in the engine room 44.

[0047] In particular, from the viewpoint of cooling the electrical equipment EC, it is best to expose the electrical equipment EC to as fresh outside air as possible. As described above, by positioning the opening 42P in the revolving frame 42 below the hydraulic pump 71 that overlaps with the inverter 63, the air (cooling air) sucked in from below through the opening 42P flows upward, passing over the electrical equipment EC such as the inverter 63, and is then discharged by the blower fan F. This improves the cooling effect of the electrical equipment EC.

[0048] The above-described electrical equipment EC may include a first electrical equipment EC1. The first electrical equipment EC1 is an electrical equipment located rearward of the electric motor 61 in the engine room 44. In the example of FIGS. 3 and 4, the charger 62, the PDU 64, and the DC-DC converter 66 are located rearward of the electric motor 61 in the engine room 44, and all of these correspond to the first electrical equipment EC1. Note that any one or two of the charger 62, the PDU 64, and the DC-DC converter 66 may be located rearward of the electric motor 61 as the first electrical equipment EC1.

[0049] By arranging the first electrical component EC1 in this manner, the space behind the electric motor 61 in the engine room 44 can be effectively utilized.

[0050] In particular, the first electrical component EC1 includes at least one of the charger 62, the PDU 64, and the DC-DC converter 66. In this case, by arranging at least one of the charger 62, the PDU 64, and the DC-DC converter 66 behind the electric motor 61, the space behind the electric motor 61 can be used effectively.

[0051] The above-described electrical equipment EC may include a second electrical equipment EC2. The second electrical equipment EC2 is an electrical equipment located above at least one of the electric motor 61 and the hydraulic pump 71 in the engine room 44. In the example of Fig. 3 and Fig. 4, the inverter 63 is located above the electric motor 61 and the hydraulic pump 71 in the engine room 44, and corresponds to the second electrical equipment EC2.

[0052] By arranging the second electrical equipment EC2 in this manner, the space above at least one of the electric motor 61 and the hydraulic pump 71 in the engine room 44 can be effectively utilized.

[0053] In particular, the second electrical component EC2 includes the inverter 63. By arranging the inverter 63 as described above, the space above at least one of the electric motor 61 and the hydraulic pump 71 can be effectively utilized.

[0054] The first electrical component EC1 is not limited to at least one of the charger 62, the PDU 64, and the DC-DC converter 66. The second electrical component EC2 is not limited to the inverter 63. In other words, the positions of the charger 62, the PDU 64, the inverter 63, and the DC-DC converter 66 can be changed as appropriate. Therefore, at least one of the charger 62, the PDU 64, and the DC-DC converter 66 can also be the second electrical component EC2. Similarly, the inverter 63 can also be the first electrical component EC1.

[0055] [5. Hydraulic component layout] 3, the hydraulic oil tank 74 described above is disposed in front of the hydraulic pump 71 in the engine room 44. On the other hand, the control valve 72 described above is disposed in front of the battery unit 53 in the engine room 44.

[0056] Such an arrangement of the hydraulic oil tank 74 and the control valve 72 makes it possible to effectively utilize the available space at the front of the engine room 44. Furthermore, within the engine room 44, the hydraulic system components excluding the hydraulic pump 71 are located at the front, and the battery unit 53 and the electrical equipment EC are located at the rear. In other words, the hydraulic system components and the electrical system components can be arranged to be separated in the fore-and-aft direction. With this arrangement, even if the hydraulic system components become hot during use of the hydraulic excavator 1, it is possible to reduce the risk of the heat from those components being transferred to the battery unit 53 and the electrical equipment EC and causing adverse effects.

[0057] In the above, a hydraulic excavator 1, which is a construction machine, has been described as an example of an electric work machine, but the electric work machine is not limited to the hydraulic excavator 1 and may be other construction machines such as a wheel loader. Furthermore, the electric work machine may be agricultural machinery such as a combine harvester or a tractor.

[0058] Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these, and the invention can be expanded or modified without departing from the spirit of the invention. [Industrial Applicability]

[0059] The present invention can be used in work machines such as construction machines and agricultural machines. [Explanation of symbols]

[0060] 1. Hydraulic excavator (electric powered work machine) 2 Undercarriage 4 Upper rotating body 41a Driver's seat 42 Swivel frame 42P opening 44 Engine Room 53 Battery Unit 61 Electric motor 62 Charger 63 Inverter 64 PDU (Battery Control Unit) 65 Junction Box 66 DC-DC converter 71 Hydraulic pump 72 Control valve 73 Hydraulic Actuator 74 Hydraulic oil tank F. Blower fan EC electrical components EC1 First Electrical Equipment EC2 Second Electrical Equipment

Claims

1. a lower running body; an upper rotating body located above the lower traveling body and rotatable relative to the lower traveling body; an electric motor disposed on the upper rotating body; a battery unit disposed on the upper rotating body and configured to store power for driving the electric motor; a junction box that relays the power supplied from the battery unit to the electric motor, The upper rotating body has a rotating frame at its bottom, the battery unit is disposed on the rotating frame below the driver's seat, The junction box is disposed above the battery unit.

2. The electric work machine according to claim 1 , wherein the junction box is disposed above the battery unit and to the rear of the battery unit.

3. The electric work machine according to claim 1 or 2, wherein the junction box is disposed at a position overlapping the battery unit in a top view.

4. The electric working machine according to claim 1 , wherein the electric motor is disposed below the junction box.

5. an inverter that converts the electric power of the battery unit and supplies the converted electric power to the electric motor; The electric work machine according to claim 1 , wherein the inverter is disposed opposite the battery unit.

6. The electric work machine according to claim 5 , wherein the inverter is disposed laterally of the battery unit.

7. The electric work machine according to claim 5 or 6, wherein the electric motor is disposed below the inverter.

8. The electric working machine according to claim 5 , wherein the junction box is disposed rearward of the inverter.

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