Independent power supply system, panel foundation, box foundation, and construction method for independent power supply system

Abstract

This simplifies the wiring work between solar panels, which are also used as paving material, and energy storage devices. [Solution] This disclosure provides an independent power supply system comprising a solar panel that also serves as a paving material and a current collection box that houses a power storage device, wherein the system comprises a box foundation having a space for housing DC power cables and a panel foundation having a recess for housing the power cable wiring groove, and the panel foundation and the box foundation are connected such that their end faces are directly attached to each other.

Description

Technical Field

[0001] The present disclosure relates to an independent power supply system, a foundation for panels, a foundation for boxes, and a construction method for an independent power supply system.

Background Art

[0002] Patent Document 1 describes a solar panel that can be laid on a road as a paving plate by using tempered glass roughened by sandblasting as a surface material. Patent Document 2 describes a paving technique in which a flat plate with a panel, in which a solar panel and a lower frame are joined, is continuously laid on a road by providing a wire groove in the lower frame.

Prior Art Documents

Patent Documents

[0003]

Patent Document Ⅰ

Patent Document Ⅱ

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, the DC power output by a solar panel is stored in a power storage device once and then supplied to a load. However, Patent Documents 1 and 2 do not assume a suitable wiring method for a solar panel and a power storage device that are also used as a paving material. In view of such conventional problems, an object of the present disclosure is to simplify the wiring work between a solar panel and a power storage device that are also used as a paving material.

Means for Solving the Problems

[0005] An independent power supply system according to one aspect of the present disclosure comprises a solar panel that also serves as a paving material and a current collection box that houses a power storage device, wherein the system comprises a box foundation having a space for housing DC power cables and a panel foundation having a recess for housing the power cable wiring groove, and the panel foundation and the box foundation are connected such that their end faces are directly attached to each other. [Effects of the Invention]

[0006] According to this disclosure, the wiring work between solar panels, which are also used as paving material, and energy storage devices can be simplified. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing an example of an independent power supply system installation. [Figure 2] This is an exploded perspective view showing an example of the structure of each component of an independent power supply system. [Figure 3] This is a cross-sectional view showing an example of the cross-sectional structure of an independent power supply system. [Figure 4] This is a cross-sectional view showing another example of the cross-sectional structure of an independent power supply system. [Figure 5] This is an exploded perspective view showing a modified example of a box base. [Figure 6] This is an exploded perspective view showing a modified example of a box base. [Figure 7] This is a cross-sectional view showing another example of the cross-sectional structure of an independent power supply system. [Figure 8] This is a plan view showing an example of the wiring route for a power generation unit. [Figure 9] This is a plan view showing another example of the wiring route for a power generation unit. [Figure 10] These are a plan view and a front view showing a modified example of the inspection cover. [Figure 11] These are a plan view and a front view showing a modified version of the installation cover. [Modes for carrying out the invention]

[0008] <Summary of the embodiments of this disclosure> The embodiments of this disclosure are outlined below. (1) The independent power supply system of this embodiment comprises a solar panel that also serves as a paving material and a current collection box that houses a power storage device, and further comprises a box foundation having a space for housing DC power cables and a panel foundation having a recess for housing the power cable wiring groove, wherein the panel foundation and the box foundation are connected such that their end faces are directly attached to each other.

[0009] According to the independent power supply system of this embodiment, the panel foundation and the box foundation are connected so that their end faces are directly attached to each other. Therefore, when running power cables between the two foundations, it becomes unnecessary to bury the power cables using cable protection conduits. Therefore, the wiring work between solar panels, which are also used as paving material, and energy storage devices can be simplified.

[0010] (2) In the independent power supply system of this embodiment, the box foundation comprises a foundation body that opens upward and a lid member that closes the opening of the foundation body, and the lid member may have a through hole for allowing the power cable to pass in the vertical direction and a gutter for allowing the power cable to pass in the horizontal direction. In this way, a cover member having through holes and gutters can be used as a member that defines the wiring route of power cables.

[0011] (3) In the independent power supply system of this embodiment, the cover member may include an installation cover portion having the through hole and an inspection cover portion which is a cover material that closes off the portion of the opening of the foundation body other than the portion that is closed off by the installation cover portion. In this way, the portion of the foundation's enclosure below the inspection cover can be used as an inspection area for checking the wiring of power cables.

[0012] (4) In the independent power supply system of this embodiment, the play may be formed in at least one of the inspection lid portion and the installation lid portion. The reason is that, for example, when the lid member is divided into an inspection lid portion and an installation lid portion, in order to draw the power cable from the panel foundation into the inside of the foundation main body, it is necessary to form a play in either or both of the two lid portions.

[0013] (5) In the independent power supply system of this embodiment, the inspection lid portion may be a steel fitting lid that is reinforced by a plurality of reinforcing ribs and the groove portion formed between the adjacent reinforcing ribs functions as the play. In this way, compared with the case of using precast concrete, the inspection lid portion can be made thinner, so that the upper surface of the inspection lid portion can be made flush with the paving surface.

[0014] (6) In the independent power supply system of this embodiment, the side wall of the foundation main body may have a knockout portion in which the outer surface is a flat surface and the inside of the side wall is thinned. In this way, by forming a crushing portion on site in the knockout portion, the insertion position of the power cable can be lowered downward. Therefore, even when the play is at a depth where a plurality of power cables cannot pass through, a wiring path can be secured by on-site construction.

[0015] (7) In the independent power supply system of this embodiment, the power collection box may have a bottom plate formed with a cable insertion hole joined to the through hole. In this way, the power cable can be drawn from the box foundation into the power collection box through the wiring path via the through hole and the cable insertion hole. For this reason, wiring can be performed without exposing the power cable outside the box.

[0016] (8) In the independent power supply system of this embodiment, the current collection box may have a multi-story structure including a lower box and an upper box, the lower box may house the energy storage device, and the upper box may house a connection unit having at least one outlet for which power is supplied from the energy storage device. In this way, the connection unit housed in the upper box can be used, for example, as an emergency charging spot.

[0017] (9) The panel foundation of this embodiment is one of the devices that constitute the subcombination of the independent power supply systems described in (1) to (8) above. Therefore, the panel foundation of this embodiment provides the same effects and advantages as the independent power supply systems described in (1) to (8) above.

[0018] (10) The box base of this embodiment is the other device that constitutes the subcombination of the independent power supply system described in (1) to (8) above. Therefore, the box base of this embodiment provides the same effects as the independent power supply systems described in (1) to (8) above.

[0019] (11) The construction method of this embodiment is the construction method of the independent power supply system described in (1) to (8) above. Therefore, the construction method of this embodiment provides the same effects and advantages as the independent power supply systems described in (1) to (8) above.

[0020] <Details of the embodiments of this disclosure> The embodiments of this disclosure will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0021] [Overall configuration of the independent power supply system] Figure 1 is a perspective view showing an example of the installation state of the independent power supply system 100. As shown in Figure 1, the independent power supply system 100 is installed in a predetermined location 200 where commercial power outdoor cables are not routed.

[0022] The installation location 200 in the diagram is a part of the sidewalk of a public road. The sidewalk is constructed, for example, by laying rectangular paving blocks 210 on compacted ground. However, the installation location 200 may be a corner of a plaza, such as an open-air parking lot or a sports field, in addition to a sidewalk on a public road. In other words, the installation location 200 can be arbitrarily selected as long as sunlight shines directly on the ground.

[0023] The independent power supply system 100 (hereinafter sometimes abbreviated as "system 100") comprises a power generation unit 10, a current collection box 20, and a base 40 for the box. In this specification, the X, Y, and Z directions shown in the figures are defined as follows: X direction: The front-to-back direction of the current collection box 20. The front side is considered positive. Y direction: The left-right direction of the current collection box 20. When viewed from the front, the right side is considered positive. Z-direction: Vertical direction. The upper side is considered positive.

[0024] The power generation unit 10 comprises a panel foundation 60 and a solar panel 80 that is also used as paving material and supported by the panel foundation 60. The power generation unit 10 is constructed so that the light-receiving surface of the solar panel 80 coincides with the road surface height GL of the installation site 200. In the system 100 shown in Figure 1, a total of 12 panel foundations 60 are used, and these panel foundations 60 are arranged in two rows in the X direction and six rows in the Y direction. However, the above number and arrangement can be arbitrarily determined depending on the amount of stored energy and the amount of sunlight.

[0025] The box foundation 40 is positioned on the negative X-direction side of the power generation unit 10 and is directly connected without gaps to some of the panel foundations 60 of the power generation unit 10. The bottom of the current collection box 20 is fixed to the upper surface of the box base 40. When fixing the bottom, a watertight condition is ensured by, for example, a sealing material. The depth dimension (X-direction dimension) of the current collection box 20 is less than half the same-direction dimension of the box base 40.

[0026] The current collection box 20 is positioned on the negative side within the X-direction range of the box base 40. As a result, a relatively large empty space is formed in the X-direction positive side of the box base 40 as viewed from the current collection box 20. This empty space corresponds to the space above the inspection cover 44, which will be described later.

[0027] [Structure of the current collection box] Figure 2 is an exploded perspective view showing an example of the structure of each component of the independent power supply system 100. As shown in Figure 2, the current collection box 20 has a multi-story structure (a two-story structure in the example shown) including a lower box 21 and an upper box 22 that are stacked vertically.

[0028] The lower box 21 has a lower case 23 that opens at the front and a lower door 24 that is attached to the opening of the lower case 23 by hinges. The lower case 23 has multiple shelves of different heights. A power storage device 27 for storing the electricity generated by the solar panel 80 is placed on one of the shelves. A distribution board 28 leading to the power storage device 27 is provided on the back of the lower case 23. Power cables (not shown) are connected to the distribution board 28 and routed into the upper box 22.

[0029] An inverter 29 may be provided on the shelf of the lower case 23. The inverter 29 converts the DC supplied from the energy storage device 27 into AC of a predetermined voltage (e.g., 100V) and supplies the converted AC to the connection unit 32 provided in the upper case 25. The lower case 23 has a bottom plate with a cable insertion hole 23A formed therein, which is joined to the through hole 45 of the installation cover 46 described later. Therefore, the power cable can be pulled from the current collection box 20 to the box foundation 40 via the through hole 45 and the cable insertion hole 23A.

[0030] In this way, power cables can be routed using wiring paths that are not exposed outside the box, enabling highly weather-resistant wiring. The lower case 23 is joined to the upper surface of the box foundation 40 (specifically, the upper surface of the installation lid 46) in a non-removable and watertight manner using anchor bolts or adhesive. However, the lower case 23 may be joined to the box foundation 40 in a detachable manner.

[0031] The upper box 22 has an upper case 25 that opens at the front, and an upper door 26 that is attached to the opening of the upper case 25 by hinges. The upper door 26 is a glass door, and the interior of the upper case 25 is visible from the outside. The upper case 25 includes a mounting platform 31 on which multiple electronic devices such as smartphones and tablet PCs 30 can be mounted, and a connection unit 32 that includes DC outlets such as USB® ports and AC outlets.

[0032] DC power is supplied directly from the energy storage device 27 to the DC outlets included in the connection unit 32, and AC power is supplied from the inverter 29 to the AC outlets included in the connection unit 32. Therefore, by placing an electronic device such as a mobile terminal 30 on the mounting base 31 of the upper case 25 and connecting the electronic device to the outlet of the connection unit 32, the electronic device can be charged by power supplied from the energy storage device 27 or inverter 29.

[0033] According to the current collection box 20 of this embodiment, charging can be performed by power supply from the energy storage device 27 that stores electricity generated by solar power generation, so even if a major power outage occurs due to an earthquake or typhoon, electronic devices such as the mobile terminal 30 can be charged. Furthermore, the connection unit 32 may be provided with only one type of outlet, rather than both DC and AC outlets. Also, the power generated by a power generation unit installed in a location other than the road surface may be stored in the energy storage device 27 of the current collection box 20.

[0034] [Structure of the foundation for the box] As shown in Figure 2, the box foundation 40 has a foundation body 41 that opens upward and a lid member 42 that closes the upper opening of the foundation body 41. The internal space of the foundation body 41 functions as a space for housing a DC power cable 90 (see Figure 3) that leads to a power storage device 27, which is installed in the lower case 23 of the current collection box 20. The box foundation 40 and the lid member 42 are both made of precast concrete and are molded in a concrete block manufacturing plant.

[0035] The foundation body 41 has a square planar shape on its outer perimeter. Therefore, all the side walls of the foundation body 41 have the same width dimension. Also, the outer surface of the side walls of the foundation body 41 is flat. A knockout section 41A is formed on the side wall of the foundation body 41 by thinning the inner wall of the side wall. The knockout section 41A is a concrete portion that can be broken with a manual tool such as a hammer. The knockout section 41A extends from the bottom plate of the foundation body 41 to the upper edge of the side wall.

[0036] A support column 41B is formed in the center of the bottom plate of the foundation body 41. The support column 41B functions as a support post foundation that supports the cover member 42 (specifically, the inspection cover 44 and the installation cover 46, which will be described later) from below. The support column 41B is, for example, a part that is integrated with the base plate of the foundation body 41 from the time of molding. However, the support column 41B may be a concrete or steel block separate from the base plate of the foundation body 41.

[0037] The cover member 42 is divided into an inspection cover portion 44 having a gutter 43 on its edge and an installation cover portion 46 having a through hole 45 inside. The installation cover portion 46 is a cover material sized to encompass the bottom surface of the current collection box 20. The inspection cover portion 44 is a cover material that closes off the portion of the opening in the foundation body 41 that is not closed off by the installation cover portion 46.

[0038] Specifically, the planar shapes of the inspection cover section 44 and the installation cover section 46 are, for example, rectangles formed by dividing the foundation body 41 exactly in half. Therefore, the inspection cover portion 44 closes the portion of the foundation body 41 that is closer to the power generation unit 10 (the positive X-direction side in the illustrated example). The installation cover portion 46 closes the portion of the foundation body 41 that is further away from the power generation unit 10 (the negative X-direction side in the illustrated example).

[0039] The gutter 43 of the inspection cover 44 is a notch with a depth that allows power cables to pass through horizontally. Specifically, the gutter 43 is a notch that connects the edge surface and the bottom surface of the inspection cover 44 (see Figure 3). The through-hole 45 in the mounting cover 46 is a vertical hole of a size that allows power cables to pass through in the vertical direction. Specifically, the through-hole 45 is an elongated hole that penetrates through the thickness direction of the mounting cover 46, approximately in the center (see Figure 3).

[0040] The inspection cover section 44 is detachably attached to the upper end surface of the side wall of the foundation body 41 and the upper end surface of the support column section 41B by anchor bolts or the like. A seal is applied to the joint surface to ensure watertightness. The installation cover portion 46 is joined to the upper end surface of the side wall of the foundation body 41 and the upper end surface of the support column portion 41B in a non-removable and watertight manner by anchor bolts or adhesive. However, the installation cover portion 46 may also be joined to the foundation body 41 in a detachable manner.

[0041] [Structure of solar panels and their foundations] As shown in Figure 2, the solar panel 80 comprises a panel body 81 having multiple cells inside, a junction box 82 attached to the bottom surface of the panel body 81, and a pair of power cables 83 extending from the junction box 82. Connectors are attached to the ends of the power cables 83. The planar shape of the panel body 81 is square.

[0042] The panel foundation 60 consists of a precast concrete slab and is formed into a square shape by dividing the planar shape of the box foundation 40 into four sections. The panel base 60 has a receiving recess 61 with a depth slightly greater than the thickness of the panel body 81. The planar shape of the receiving recess 61 is a square, with the dimensions of each side being approximately the same as those of the panel body 81.

[0043] The bottom surface of the housing recess 61 has a central recess 62 capable of housing a junction box 82 and a plurality (four in the illustrated example) of wiring grooves 63 capable of housing power cables 83. Each wiring groove 63 is a groove that extends from the central recess 62 to the edge surface of the panel foundation 60. Therefore, when the solar panel 80 is placed on the panel base 60, the junction box 82 fits into the central recess 61 and the power cable 83 fits into the wiring groove 63, allowing the panel body 81 to be fitted into the housing recess 61.

[0044] Although not shown in the illustration, a cushion plate, for example made of rubber or plastic, is interposed between the bottom surface of the housing recess 61 and the back surface of the panel body 81. This cushion plate functions as a buffer to prevent the solar panel 80 from being damaged by the weight of passersby.

[0045] [An example of a cross-sectional structure of an independent power supply system] Figure 3 is a cross-sectional view showing an example of the cross-sectional structure of the independent power supply system 100. As shown in Figure 3, the foundation body 41 of the box foundation 40 is installed on top of a mortar layer 220 that is constructed on the bottom surface of the excavated ground.

[0046] The panel foundation 60 for the power generation unit 10 is installed on the subsoil layer 230 of the ground, similar to the case of the pavement blocks 210. The subsoil layer 230 is, for example, a compacted sandy layer, but it may also be a layer containing mortar components. When the solar panels 80 are mounted in the receiving recesses 61 (see Figure 2) of the panel foundations 60, the two are integrated to have approximately the same thickness as the pavement blocks 210. Therefore, each solar panel 80 of the power generation unit 10 is installed so that its light-receiving surface coincides with the road surface height GL.

[0047] Some of the multiple panel foundations 60 and the box foundation 40 (inspection cover section 44 in Figure 3) are connected to each other at their end faces in a "direct connection" state. A "direct connection" state is a connection state in which there is no protective conduit for the power cable, and includes, for example, the following states. State 1: A state in which two adjacent members in the X direction are connected without any intervening material. State 2: A state in which two adjacent members in the X direction are connected via a thin intervening material such as a joint filler. The joint filler may be either wet or dry.

[0048] As shown in Figure 3, the wiring groove 63 of the panel foundation 60, which is directly attached to the inspection cover 44, communicates with the gutter 43 of the inspection cover 44. Therefore, the power cable 83 of the solar panel 80 can reach the inside of the foundation body 41 via the gutter 43. Inside the base body 41, a relay power cable 90 is connected to the power cable 83. The power cable 90 can reach the inside of the lower case 23 via the through hole 45 and the cable insertion hole 23A, and is connected to the energy storage device 27 inside the lower case 23.

[0049] In the cross-sectional structure of Figure 3, if the depth of the gutter 43 of the inspection cover 44 is too shallow to allow, for example, multiple power cables 83 to pass through, the knockout portion 41A may be broken to secure space for the power cables 83 to pass through. As shown in Figure 3, if the panel foundation 60 and the box foundation 40 are connected so that their end faces are directly attached to each other, then when running power cables 83 between the two foundations 60 and 40, it becomes unnecessary to bury the power cables 83 using cable protection conduits such as flexible pipes. Therefore, the wiring work between the solar panels 80 and the energy storage device 27 becomes simpler.

[0050] [Installation method for an independent power supply system] Referring to Figure 3, an example of the installation method for the independent power supply system 100 will be described. The installation method for the independent power supply system 100 in this embodiment includes, for example, the following steps. Step 1: The ground is excavated to a predetermined depth, the foundation body 41 is placed on top of the mortar layer 220 applied to the bottom of the excavation, and the excavation is backfilled. Step 2: The base layer 230 is constructed until it reaches the outer surface of the side wall of the foundation body 41.

[0051] Step 3: Install the paving blocks 210 and the panel foundations 60 on top of the base layer 230. The installation position of the panel foundation 60 is such that its own wiring groove 63 is in communication with the wiring groove 63 of the adjacent panel foundation 60. The installation position of the panel foundation 60 for bringing the power cable 83 into the box foundation 40 is such that it is close to the inspection cover portion 44 so that their end faces are directly attached, and the wiring groove portion 63 and the gutter 43 are in communication with each other.

[0052] Step 4: Multiple solar panels 80 connected in series are fitted into corresponding recesses 61 of multiple panel bases 60. At this time, the power cables 83 are housed in the wiring grooves 63. Step 5: The power cables 83 are temporarily gathered inside the main foundation 41. Step 6: Attach the installation cover 46 to the opening of the base body 41, and fix the current collection box 20 on top of the installation cover 46.

[0053] Step 7: The power cable 90 leading to the energy storage device 27 inside the current collection box 20 is pulled into the interior of the foundation body 41 by passing it through the through hole 45 and the cable insertion hole 23A. Step 8: Inside the base body 41, connect the connector of power cable 83 to the connector of power cable 90. Step 9: Install the inspection cover 44 into the opening of the foundation body 41. At this time, multiple power cables 83 are consolidated so that they all pass through the gutter 43 of the inspection cover 44.

[0054] [Another example of the cross-sectional structure of an independent power supply system] Figure 4 is a cross-sectional view showing another example of the cross-sectional structure of the independent power supply system 100. The cross-sectional structure of Figure 4 differs from the cross-sectional structure of Figure 3 in the following respects. Otherwise, it is the same as the cross-sectional structure of Figure 3. Difference 1: The upper end surface of the foundation body 41 is approximately at the same height as the road surface GL. Difference 2: No gutter 43 is formed in the inspection cover portion 44. Difference 3: A break section 41C for cable passage is formed in the knockout section 41A of the foundation body 41. The break section 41C is formed by workers during the construction of the system 100.

[0055] In the cross-sectional structure of Figure 4, the contact surface of the foundation body 41 can be set higher compared to the cross-sectional structure of Figure 3, because a fracture section 41C is formed in the foundation body 41. Therefore, there is an advantage in that the amount of excavation of the ground can be reduced compared to the cross-sectional structure of Figure 3. Furthermore, since it is no longer necessary to form a gutter 43 in the inspection cover section 44, there is also the advantage of reducing the manufacturing cost of the box foundation 40.

[0056] [Variations of foundations for boxes] Figures 5 and 6 are exploded perspective views showing modified examples of the box base 40. As shown in Figures 5 and 6, a key feature of the modified box foundation 40 is that the inspection cover 44 is made of steel. Specifically, the inspection cover 44 shown in Figures 5 and 6 consists of a fitted cover 52 that can be fitted into a support frame 51 provided on the foundation body 41.

[0057] The support frame 51 has a U-shaped frame structure in plan view, which is made by connecting one end of a pair of left and right L-shaped steels 51L and 51R with another L-shaped steel. The fitted cover 52 is a square steel plate sized to fit perfectly into the support frame 51, with multiple parallel reinforcing ribs 52A protruding from its underside. The grooves formed between adjacent reinforcing ribs 52A function as gutters 43 for allowing power cables 83 to pass horizontally.

[0058] As shown in Figures 5 and 6, in the modified box foundation 40, two support frames 51, 51 are fixed adjacent to each other in the Y direction at the opening in the side wall of the foundation body 41. When the fitted cover 52 is attached to the support frame 51, the fitted cover 52 is fitted onto the support frame 51 from above with the reinforcing rib 52A oriented parallel to the pair of left and right L-shaped steel beams 51L, 51R. The orientation of the tips of the two support frames 51, 51 may be the same or different.

[0059] Specifically, as shown in Figure 5, the tips of both support frames 51, 51 may be pointed towards the positive X direction. Alternatively, as shown in Figure 6, the tip of one support frame 51 may be pointed towards the positive X direction, and the tip of the other support frame 51 may be pointed towards the positive Y direction. Although not shown in the figure, the tip of one support frame 51 may be pointed towards the negative Y direction, and the tip of the other support frame 51 may be pointed towards the positive Y direction.

[0060] [Another example of the cross-sectional structure of an independent power supply system] Figure 7 is a cross-sectional view showing another example of the cross-sectional structure of the independent power supply system 100. The cross-sectional structure of Figure 7 differs from the cross-sectional structure of Figure 3 in the following respects. Otherwise, it is the same as the cross-sectional structure of Figure 3. Difference 1: The inspection cover section 44 consists of the fitted cover 52 shown in Figures 5 and 6. Difference 2: The upper surface of the fitted cover 52 coincides with the road surface height GL.

[0061] Since the fitted cover 52 is a steel plate reinforced with reinforcing ribs 52A, its thickness can be reduced compared to a concrete cover. Therefore, the upper surface of the fitted cover 52 can be lowered to the same level as the road surface height GL, similar to the solar panel 80. Furthermore, the groove formed between the reinforcing ribs 52A, 52A functions as a gutter 43 that allows the power cable 83 to pass horizontally, which has the advantage of ensuring the passage of the power cable 83 while making the inspection cover 44 thinner.

[0062] [Power cable wiring routes] Figure 8 is a plan view showing an example of the wiring route of the power cable 83. Figure 9 is a plan view showing another example of the wiring route of the power cable 83. The dashed lines in the figures indicate the reinforcing ribs 52A. In Figures 8 and 9, the three solar panels 80A, 80B, and 80C are assumed to be a first panel group connected in series, and the three solar panels 80C, 80D, and 80E are assumed to be a second panel group connected in series.

[0063] In the example shown in Figure 8, the reinforcing ribs 52A of the two fitted covers 52, 52 that close off the foundation body 41 are both oriented in the X direction. In this case, the power cable 83 for the first group of panels is routed from the solar panel 80C into the foundation body 41. The power cable 83 for the second group of panels is routed from the solar panel 80D into the foundation body 41.

[0064] In the example shown in Figure 9, of the two fitted covers 52, 52 that close the foundation body 41, the reinforcing rib 52A of the left fitted cover 52 is oriented in the X direction, and the reinforcing rib 52A of the right fitted cover 52 is oriented in the Y direction. In this case, the power cable 83 for the first group of panels is routed from the solar panel 80C to the foundation body 41. The power cable 83 for the second group of panels is routed from the solar panel 80F into the foundation body 41.

[0065] Thus, according to the box foundation 40 of this embodiment, the direction in which the power cable 83 is taken into the foundation body 41 can be changed by changing the orientation of the reinforcing rib 52A (gutter 43) of the fitted cover 52.

[0066] [Modified view of the inspection cover] Figure 10 shows a modified example of the inspection cover section 44, including a plan view and a front view. The inspection cover section 44 in Figure 10 is a rectangular concrete cover that divides the foundation body 41 exactly in half. In this respect, it is similar to the inspection cover section 44 in Figure 2, but the inspection cover section 44 in Figure 10 differs from the inspection cover section 44 in Figure 2 in that it has gutters 43 not only on the edge surface extending in the Y direction, but also on both the left and right edge surfaces extending in the X direction.

[0067] As shown in Figure 10, by forming a gutter 43 on the edge extending in the Y direction, power cables 83 can be drawn in not only from adjacent panel foundations 60 in the Y direction but also from adjacent panel foundations 60 in the X direction. Therefore, there is an advantage in that the degree of freedom in the arrangement pattern of the solar panels 80 and the wiring path of the power cables 83 that can be selected in the design of system 100 is increased.

[0068] [Modified view of the installation cover] Figure 11 shows a modified example of the installation cover portion 46, as well as a plan view and a front view. The mounting cover portion 46 in Figure 11 differs from the mounting cover portion 46 in Figure 2 in the following respects. Difference 1: It is rectangular (specifically square) in shape, the same size as the main foundation 41. Difference 2: Guts 43 are formed on all four edges. Difference 3: An inspection window 47 is formed on the positive side in the X direction when viewed from the through hole 45. The inspection window 47 functions as a receiving frame for a steel or concrete inspection cover.

[0069] As shown in Figure 11, if the installation cover portion 46 is made into a rectangle the same size as the foundation body 41 and gutters 43 are formed on all four sides, power cables 83 from the panel foundations 60 adjacent to all sides of the installation cover portion 46 can be routed into the foundation body 41. Therefore, there is an advantage in that the degree of freedom in the arrangement pattern of the solar panels 80 and the wiring path of the power cables 83 that can be selected in the design of system 100 is increased.

[0070] [Other variations] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments described above, and includes all modifications within the scope equivalent to the configurations described in the claims.

[0071] In the embodiment described above, a dummy pavement, formed in the same planar shape as the panel body 81 of the solar panel 80, may be fitted into some of the multiple panel foundations 60 that constitute the power generation unit 10. In this case, the desired design can be applied to the appearance of the power generation unit 10 by arranging the solar panels 80 and dummy pavement slabs, for example, in an alternating pattern.

[0072] In the above embodiment, a display device such as a liquid crystal panel that displays the remaining charge of the power storage device 27 may be provided on the wall or door portion of the current collection box 20. In the above-described embodiment, a speaker may be attached to the wall or door portion of the current collection box 20, and information such as the presence of charging facilities or emergency alerts during disasters may be transmitted from the speaker.

[0073] In the above-described embodiment, the box foundation 40 functions not only as a foundation to support the current collection box 20, but also as a "consolidation box" that pulls in and consolidates the power cables 83 of the multiple solar panels 80 included in the power generation unit 10. Therefore, in the disclosure of the above embodiments, "foundation for the box" may be read as "integration box." Accordingly, the above embodiments also include the independent power supply system described below.

[0074] [Note 1] An independent power system equipped with solar panels that also serve as paving material, A collection box having a space for housing DC power cables leading to the solar panels, The panel base comprises a recess for housing the power cable wiring groove formed therein, The panel foundation and the aggregation box are connected in an independent power supply system such that their end faces are directly attached to each other.

[0075] In the above-described embodiment, the box foundation 40 functions not only as a foundation to support the current collection box 20, but also as an inspection section for the power cables 83 and 90 that converge at the current collection box 20. Therefore, the above-described embodiment also includes the independent power supply system described below.

[0076] [Note 2] A current collection box that houses a power storage device powered by solar panels, An independent power supply system comprising a box foundation laid on the ground, The aforementioned box foundation is A foundation body with an opening at the top, which has a space for housing DC power cables, The foundation body has a cover member that closes the opening, The aforementioned lid member is The installation cover portion on which the current collection box is installed, An independent power supply system including an inspection cover that is opened during internal inspection of the foundation body. [Explanation of symbols]

[0077] 10 power generation units 20 Current collection box 21 Lower box 22 Top box 23 Lower case 23A Cable insertion hole 24 Lower door 25 Upper case 26 Upper door 27 Energy storage devices 28 Distribution boards 29 Inverter 30 Mobile devices 31 Mounting platform 32 connection units 40 Box Base 41 Foundation 41A Knockout section 41B Strut part 41C Fracture 42 Lid member 43 Gutter 44 Inspection cover section 45 through holes 46 Installation lid part 47 Inspection window section 51 Support frame 52 Snap-on lid 52A Reinforcement Rib 60 Panel Foundation 61 Receiving recess 62 Central recess 63 Wiring groove section 80 solar panels 80A~80F Solar Panels 81 Panel body 82 Junction Box 83 Power Cables 90 Power Cables 100 independent power supply systems 200 Installation locations 210 Paving blocks 220 Mortar layer 230 Base layer

Claims

1. An independent power supply system comprising solar panels that also serve as paving material, and a current collection box that houses a power storage device, A box foundation having space for housing DC power cables, The panel base comprises a recess for housing the power cable wiring groove formed therein, An independent power supply system in which the panel foundation and the box foundation are connected such that their end faces are directly attached to each other.

2. The aforementioned box foundation is It comprises a foundation body that opens upward and a cover member that closes the opening of the foundation body, The aforementioned lid member is The independent power supply system according to claim 1, further comprising a through hole for allowing the power cable to pass in the vertical direction and a gutter for allowing the power cable to pass in the horizontal direction.

3. The aforementioned lid member is The installation cover having the aforementioned through hole, The independent power supply system according to claim 2, further comprising an inspection cover, which is a cover material that closes off the portion of the opening of the foundation body other than the portion that is closed off by the installation cover.

4. The aforementioned gutter is, The independent power supply system according to claim 3, formed in at least one of the inspection cover portion and the installation cover portion.

5. The inspection cover portion is, The independent power supply system according to claim 4, comprising a steel snap-in cover reinforced with a plurality of reinforcing ribs, wherein the grooves formed between adjacent reinforcing ribs function as the gutter.

6. The side walls of the aforementioned foundation body are An independent power supply system according to any one of claims 1 to 5, wherein the outer surface is a flat surface and the inner side of the side wall is thinned to form a knockout portion.

7. The aforementioned current collection box is An independent power supply system according to any one of claims 2 to 5, having a bottom plate in which a cable insertion hole is formed to be joined to the aforementioned through hole.

8. The aforementioned current collection box is It is a multi-story structure including a lower box and an upper box. The lower box contains, The aforementioned energy storage device is housed in, The upper box contains, The independent power supply system according to claim 7, comprising a connection unit having at least one outlet supplied with power from the energy storage device.

9. A panel foundation used in an independent power supply system that includes solar panels that also serve as paving material, and a current collection box that houses a power storage device, A recessed area for housing a DC power cable with a wiring groove formed therein, A panel foundation comprising an end face that is directly connected to the end face of a box foundation having a space for housing the power cable.

10. A box foundation used in an independent power supply system comprising solar panels that also serve as paving material and a current collection box that houses a power storage device, The space for housing DC power cables, A box foundation comprising an end face that is directly connected to the end face of a panel foundation having a recess for housing a wiring groove for the power cable.

11. A method for constructing an independent power supply system comprising solar panels that also serve as paving material, and a current collection box that houses a power storage device, The first step is to lay a foundation for a box that has space for housing DC power cables, The second step includes laying a panel foundation having a recess for housing the power cable wiring groove, The second step described above is: A method for constructing an independent power supply system, comprising the step of connecting the panel foundation and the box foundation such that their end faces are directly attached to each other.

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