KR100979848B1 - Washing apparatus of solar cell and control method for the same - Google Patents

Abstract

The present invention relates to a cleaning apparatus for a solar panel and a method of cleaning the same for removing the dust, snow, rainwater, and the like accumulated on the top of the solar panel to maximize the amount of power generation of the photovoltaic device. A washing apparatus for washing, comprising: a washing unit spraying a cleaning liquid while traveling in contact with an upper surface of the solar panel; Washing liquid supply means for supplying the washing liquid to the washing means; And washing unit moving means for driving the washing unit from one side of the solar panel to the opposite side while spraying the washing liquid in the washing unit to wash the upper surface of the solar panel.

According to the present invention, if the top surface of the solar panel is contaminated by snow, rainfall or dust without confirmation by the administrator, it is determined by each of them and automatically wash the top surface of the solar panel, when the outside temperature is high by spraying the cleaning liquid By lowering the temperature of the solar panel, the power generation efficiency of the solar panel is maximized.

Solar Panel, Cleaning, Cleaning Solution, Motor, Solenoid Valve, Temperature Sensor, Light Sensor

Description

Washing apparatus of solar cell and its cleaning method {Washing apparatus of solar cell and control method for the same}

The present invention relates to a solar panel cleaning apparatus and a method for cleaning the same, and specifically, to remove dust, snow, rainwater, etc. accumulated on the upper panel of the photovoltaic device, by cooling when the temperature of the solar panel is high, The present invention relates to a cleaning apparatus for a solar panel and a method of cleaning the same for maintaining the amount of power generated by the photovoltaic device to the maximum.

Recently, the global environmental problems such as global warming due to the use of fossil fuels and difficulty in treating nuclear wastes at nuclear power plants have emerged, and researches for utilizing the clean energy of nature have been actively conducted.

The use of natural energy is a method of using energy sources that can be used without harming the earth's environment such as solar power, tidal power, and wind power.

Here, photovoltaic power generation using solar cells is a technology for directly converting sunlight into electrical energy. The photovoltaic device converts light energy into electrical energy by photoelectric effect when sunlight is received.

Photovoltaic power generation is composed of a module consisting of a solar cell including a photoelectric conversion element, a storage battery and a power conversion inverter.

The solar power generation system is developing and using various devices to increase power generation efficiency, such as installing solar tracking devices for tracking solar cell modules according to the change in the amount of sunlight according to the season or the movement of the sun from morning to evening. to be.

In addition to the problem of power generation efficiency caused by the amount of sunlight or the movement of the sun, it is a problem to block sunlight or reduce the amount of sunlight from the outside of the photovoltaic system, and to accumulate dust, foreign matter, snow, and rain on the surface of the solar panel. And the like cause a problem of reducing the power production efficiency of the photovoltaic system.

The technology related to the cleaning device for cleaning the surface of such a photovoltaic power generation system is disclosed in Republic of Korea Patent Publication No. 2007-0015693.

That is, in the patent publication, as shown in FIG. 1, the solar panel 110 is installed on the upper part of the mobile house 115, and the cleaning unit 120 cleans the surface of the solar panel 110. It is provided. The washing means 120 includes a pump 113, a pipe 121 installed on one side of the solar cell frame 111, a plurality of nozzles 122, a pipe 121, and a pump arranged at equal intervals on the pipe 121. Consists of a connection hose 124 for connecting the 113. The pump 113 is controlled by the controller 112. When the operation button provided in the controller 112 is pressed, the pump 113 is operated and the washing water is supplied to the pipe 121 to supply the solar panel through each nozzle 122. 110) It is a technology for increasing the power generation efficiency of the solar panel 110 by removing the foreign matter and dust on the surface of the panel 110 while spraying high pressure to the surface.

However, in the technique disclosed in the above publication, when dust accumulates on the solar panel, water is simply sprayed to remove foreign substances or dust, but spraying is terminated irrespective of whether or not the foreign substances or dust are well cleaned. In addition to the occurrence, there is an inconvenience that the administrator must check whether the foreign matter or dust accumulated and spray by pressing the operation button.

In addition, there is no countermeasure against the case where snow accumulates on the surface of the solar panel or when rain water is deposited.

In addition, in the solar panel, when the temperature of the outside air is increased by 1 ° C based on 25 ° C as a standard, the power generation efficiency decreases by 0.5%.

Therefore, an object of the present invention is to solve the above-mentioned problems, and if the power generation efficiency of the photovoltaic power generation system falls without the administrator's confirmation, is it caused by the temperature of the outside air, or is it caused by pollution, snow, or rainfall on the top of the solar panel? To determine and to provide a cleaning device and a method of cleaning the solar power system for automatically cleaning the upper surface of the solar panel.

In addition, another object of the present invention is to provide a washing apparatus and a method for cleaning the solar power generation system that can be washed clean even if the contamination on the top of the solar panel is serious.

In addition, another object of the present invention is a washing apparatus of the solar power generation system that can clean the upper part of the solar panel to clean the upper part of the solar panel when the cleaning device is not clean after washing the top of the solar panel and its To provide a cleaning method.

In addition, another object of the present invention is to compare the output voltage of the photovoltaic panel with a reference value cleaning of the solar power generation system does not clean the solar panel when the sensor that detects contamination, snow, rainfall on the top of the solar panel abnormal operation It is to provide an apparatus and a cleaning method thereof.

In addition, another object of the present invention is to provide a washing device of the solar power system to have the maximum power generation efficiency by lowering the temperature of the solar panel by automatically operating the cleaning device when the temperature of the solar panel rises above a certain temperature and It is to provide a cleaning method.

In the cleaning apparatus for a solar panel according to the present invention for achieving the above object, the cleaning device for cleaning the upper surface of the solar panel, washing unit for spraying the cleaning liquid while driving in contact with the upper surface of the solar panel; Washing liquid supply means for supplying the washing liquid to the washing means; Washing unit moving means for driving the washing unit from one side of the solar panel to the opposite side while spraying the washing liquid in the washing unit to wash the upper surface of the solar panel; Characterized in that it comprises a.

In addition, in the washing apparatus of the solar panel according to the present invention, the washing unit moving means is attached to the rollers at both ends of the washing unit, the guide that the roller runs on one side and sides other than the opposite side of the solar panel Rail is installed, characterized in that it comprises a drive source for driving the washing unit.

In addition, in the apparatus for cleaning a solar panel according to the present invention, the cleaning unit is formed with a plurality of injection holes for spraying the cleaning liquid, the lower portion is characterized in that it comprises a brush in contact with the upper surface of the solar panel.

In addition, in the cleaning apparatus for a solar panel according to the present invention, the cleaning apparatus comprises: a state sensing unit for sensing a state of the solar panel related to power generation efficiency of the solar panel; A memory unit which stores a reference value related to the power generation efficiency; A state determination unit comparing the value input from the state detection unit with a reference value stored in the memory unit; A control unit for controlling the washing liquid supply means and the washing unit moving means; The control unit, if the power generation efficiency is determined to be less than the reference value in the state determination unit, characterized in that the control unit for supplying the cleaning liquid supplying the cleaning liquid and driving the cleaning unit moving means.

In the solar cell cleaning apparatus according to the present invention, the memory unit has a rated output value of the solar panel, a reference value for the temperature of the solar panel, and an upper surface of the solar panel as a reference value related to power generation efficiency. Or store each reference value (rated voltage value of the solar panel or rated output voltage value of the inverter) as to whether or not it is contaminated by dust, and wherein the status determination unit is each input value inputted from the state sensing unit and the memory unit. It is characterized by comparing the respective reference values stored in the judgment.

In addition, the cleaning method of the solar panel according to the present invention for achieving the above object is a washing unit for spraying the cleaning liquid while driving in contact with the upper surface of the solar panel; Washing liquid supply means for supplying the washing liquid to the washing means; Washing unit moving means for driving the washing unit from one side of the solar panel to the opposite side while spraying the washing liquid in the washing unit to wash the upper surface of the solar panel; A method for cleaning a solar panel comprising: a temperature comparison step of determining whether a temperature of the solar panel exceeds a reference value; A pollution discrimination step of determining whether the upper surface of the solar panel is contaminated by snow, rain or dust when the temperature is lower than a reference value; In the temperature comparison step, when the temperature of the solar panel exceeds a reference value or when it is determined that the upper surface of the solar panel is contaminated in the contamination discrimination step, the cleaning solution supply means supplies the cleaning solution to the cleaning unit while the cleaning solution is supplied. It characterized in that it comprises a; washing step of moving the secondary means.

In addition, the method for cleaning a solar panel according to the present invention further includes a power generation output efficiency sensing step of determining whether the power generation of the solar panel is greater than the rated voltage, if the power generation is less than the rated output in the power generation output efficiency detection step; Characterized in that proceeds to the temperature sensing step.

In addition, the cleaning method of the solar panel according to the present invention is characterized in that the cleaning unit moving means to run from one side of the solar panel to the opposite side.

In addition, the cleaning method of the solar panel according to the present invention is characterized in that the cleaning unit moving means proceeds to the contamination discrimination step after proceeding to the opposite side.

As described above, in the solar cell cleaning apparatus and the cleaning method thereof according to the present invention, when the outside temperature is high automatically without the administrator's confirmation, by spraying the cleaning liquid to cool the solar panel, the power generation efficiency of the solar panel is maximized. It is effective to make.

In addition, the solar panel cleaning apparatus and the cleaning method according to the present invention, if the upper surface of the solar panel is contaminated by snow, rainfall or dust, etc., respectively, by determining this, by automatically washing the upper surface of the solar panel, It is effective to maximize the power generation efficiency.

In addition, the cleaning apparatus and the cleaning method of the solar panel according to the present invention has the effect that can be washed clean even if the contamination of the solar panel upper surface is serious.

In addition, the cleaning device and the method of cleaning the solar panel according to the present invention has the effect that the cleaning device is continuously operated when the cleaning is not cleaned after cleaning the top of the solar panel to clean the top of the solar panel. .

In addition, the washing apparatus and the washing method of the solar panel according to the present invention has the effect that does not wash the solar panel when the sensor for detecting the contamination by snow, rainfall or dust on the upper solar panel abnormal operation.

Hereinafter, a preferred embodiment of a solar panel washing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing the concept of a solar panel washing apparatus according to the present invention, Figure 3 is a detailed view of the washing unit in the washing apparatus of the solar panel according to the present invention.

In FIG. 2, reference numeral 10 denotes a solar cell panel, and the solar cell panel 10 denotes S1... It consists of several blocks or one block partitioned by S12.

Guide rails 12 for guiding the rollers 16 mounted on the washing unit 30 to be described later are provided on the upper and lower sides of the solar panel 10. In addition, the right side of the solar panel 10 is provided with a rotating shaft 26 fixed to both sides as pulleys 22 and 23, and both sides as pulleys 24 and 25 also on the left side of the solar panel 10. The fixed rotating shaft 27 is provided.

The rotary shafts 26 and 27 are fixed by bearings, not shown, and one end of the rotary shaft 26 on the right side is connected to the micro motor 21 and the like via a reduction gear not shown. In addition, belts 28 are fitted into pulleys 22 and 23 fixed to both ends of the rotation shaft 26 on the right side and pulleys 24 and 25 fixed to both ends of the rotation shaft 27 on the left side.

And both ends of the washing unit 30 is fixed to the upper belt 28 and the lower belt 28 by the fastening means 29, fastening means 29 fixed to both ends of the washing unit 30 and The rollers 14 and 16 are attached to the lower portion of the washing unit 30 in the adjacent position, and the upper and lower belts 28 are moved by the driving force generated from the driving source such as the micromotor 21. The washing unit 30 fixed to the 28 has rollers 14 and 16 rolled along the guide rails 12 from the left side to the right side of the solar panel 10 or from a driving source such as the micro motor 21. When rotated in the direction is moved from the right side of the solar panel 10 to the left side.

In addition, the left and right sides of the solar panel 10 are provided with limit switches or proximity switches 78 and 77 for stopping the movement of the washing unit 30, and the washing unit 30 includes the solar panel 10. When the switch is moved to the left side or the end of the right side, the switches 78 and 77 are switched to stop the micromotor 21.

The cleaning part 30 provided in this way is provided with the cleaning liquid supplied from the water supply source or the cleaning liquid supply 40 (hereinafter, "water" or "washing liquid" are called "cleaning liquid") by the operation of the solenoid valve 42. It is supplied to the washing unit 30 through (44). Here, the cleaning liquid is supplied by the operation of the solenoid valve 42 while the washing unit 30 drives the micro motor 21 to clean the solar panel 10.

As the cleaning unit 30 moves in contact with the surface of the solar panel 10, snow, rain, dust, etc. accumulated on the upper surface of the solar panel 10 are washed.

And a temperature sensor 73 for sensing the temperature of the solar panel 10 to be described later and the light amount sensor 75 for detecting the amount of light reflected on the solar panel 10 is installed around the solar panel 10. .

Hereinafter, the structure of the washing unit 30 will be described with reference to FIG.

In FIG. 3, 32 is a metal steel pipe which has a hollow part, and has a several injection hole 34 in which the cleaning liquid can be sprayed in the lower part. The lower part of the metal steel pipe 32 is provided with a groove fixing brush 38 for fixing the brush 36, and the brush 36 can be inserted into or removed from the groove of the brush fixing part 38 so that the brush If 36 is worn out, it can be replaced with a new brush 36.

And since the injection holes 34 are bored on both sides of the brush fixing part 38, even if the washing unit 30 is washed while moving from the right side to the left side or the left side to the right side of the solar panel 10, the solar panel 10 The upper surface of the can be cleaned thoroughly.

Hereinafter, a circuit for automatically washing the solar panel according to the present invention will be described.

4 is a block diagram for automatically washing the solar panel according to the present invention.

In Figure 4, 60 is a memory unit for storing the reference value of the state according to the rated output voltage, temperature and the type of pollution of the solar panel 10, 61 is a reference value for the rated output of the solar panel 10 The first recording area, 62 is a second recording area for storing the value of the reference temperature at which the power generation efficiency of the solar panel 10 is greatly reduced, and 63 is the amount of light when snow is accumulated on the solar panel 10. A third recording area for storing the reference value, 64 is a fourth recording area for storing the reference value of the amount of light when rain water is buried in the solar panel 10, 65 is a dust when accumulated on the solar panel 10 The fifth recording area stores a reference value of the amount of light.

In addition, after the fifth recording area, data obtained by converting the output voltage of the battery cell of the solar panel 10, the temperature detected by the temperature sensor 73, and the light amount detected by the light quantity sensor 75 into digital values is stored. It is a recording area.

The memory unit 60 may be composed of one semiconductor memory such as a ROM, a RAM, a PROM, or the like, and the first recording area 61 to the fifth recording area 65 may include read only memory such as a ROM or a PROM. The recording area next to the fifth recording area 65 may be a random memory that can be easily updated whenever necessary, such as RAM or SRAM.

In FIG. 4, 50 is a microprocessor unit, and is provided with the state determination part 52 which judges the state of the control part 51 and the solar panel 10. As shown in FIG.

The state determination unit 52 is a reference value for the rated output of the solar panel 10 stored in the first recording area 61 in the memory unit 60 through the control unit 51 and the battery cells of the current solar panel 10. Compares the voltage output from the reference value, and compares the reference value of the temperature of the solar panel 10 stored in the second recording area 62 with the current temperature of the solar panel 10 input from the temperature sensor 73. do. And a light quantity reference value when snow accumulates in the solar panel 10 stored in the third recording region 63, a light quantity reference value when rain water is applied to the solar panel 10 stored in the fourth recording region 64, and The reference value of each light quantity when dust is accumulated in the solar panel 10 stored in the recording area 65 of 5 and the value of the light quantity converted from the light quantity sensor 75 according to the change of the situation of the solar panel 10 are compared. do.

The state determination unit 52 outputs the result determined by comparing as described above to the control unit 51.

In Fig. 4, reference numeral 71 denotes an input terminal of a voltage output from the battery cells forming the blocks S1 ... S12 of the solar panel 10, and this voltage value is converted into a digital value by the A / D converter 72. And the output to the control unit 51, the temperature and light output from the temperature sensor 73 and the light amount sensor 75 installed around the solar panel 10 is also digital by the A / D conversion unit (74) (76) Each value is converted to a value and output to the control unit 51. The controller 51 temporarily stores each digital value input from the battery cell voltage input terminal 71, the temperature sensor 73, and the light quantity sensor 75 in the sixth to eighth recording areas, and stores these values as follows. According to the flowchart of FIG. 5 described in FIG. 5, the state determination unit 52 may read the file at the required time.

In FIG. 4, the limit switches 77 and 78 are installed at the left and right sides of the solar panel 10 as described above, and output the limits for the movement of the washing unit 30 to the controller 51. .

In Fig. 4, 20 includes a micromotor 21 and a solenoid valve 42 as a drive device. Of course, the control unit 51 and the micromotor 21 or the solenoid valve 42 of the drive device 20 includes an interface (not shown).

FIG. 5 is a flowchart illustrating an operation of the solar panel cleaning apparatus shown in FIGS. 2 and 4.

Washing unit 30 for spraying the cleaning liquid while driving in contact with the upper surface of the solar panel 10, cleaning liquid supply means (40) (42) (44) for supplying the cleaning liquid to the cleaning unit 30 and the sun Washing unit moving means for driving the washing unit 30 from one side of the solar panel 10 to the opposite side while spraying the cleaning liquid from the washing unit 30 to wash the upper surface of the panel 10 In the method for cleaning a solar panel comprising a, the rated output voltage (A) of the battery cells (S1 ... S12), the reference temperature value (B) for the proper output of the solar panel 10, the eyes of the solar panel 10 The light quantity reference value (C) at the time of the accumulation, the light quantity reference value (D) when rain water is deposited on the solar panel 10, and the light quantity reference value (E) when dust is accumulated on the solar panel 10, are stored in the memory unit 60. The data is stored in the first to fifth recording areas 61 to 65, respectively (step S10).

Next, the state determination unit 52 starts from the reference value A of the rated output voltage, the battery cell voltage, and the voltage input terminal 71 that should normally be output from the battery cells S1 ... S12 stored in the first recording area 61. The input voltage is converted into a digital value through the A / D converter 72 to receive the value stored in the sixth recording area from the controller 51 to determine whether the generation of the solar panel 10 is normal or not. If not, the process proceeds to the next step and, if normal, the determination is continuously performed (step S20).

If it is not normal in step S20, the state determination unit 52 is a reference value (B) for the temperature of the solar panel 10 stored in the second recording area 62 and the solar panel (input from the temperature sensor 73) ( The current temperature of 10) is converted into a digital value through the A / D converter 74 to receive the value stored in the seventh recording area from the controller 51 to determine whether the temperature of the solar panel 10 is higher than the reference value. In the case where the reference value is higher than the reference value, a signal is output to the control unit 51 so as to operate the driving device 20. When the reference value is lower than the reference value, the process proceeds to the next step (step S30).

The state determination unit 52 is inputted from the reference value C of the amount of light when the snow accumulates in the solar panel 10 stored in the third recording area 63 and the amount of light sensor 74 when the reference value is lower than the reference value in step S30. The amount of light incident on the solar panel 10 is converted into a digital value through the A / D converter 76 to receive the value stored in the eighth recording area from the controller 51. If it is greater than or equal to the reference value, the controller 51 outputs a signal to the controller 51 to operate the driving device 20, and if it is larger than the reference value, proceeds to the next step (step S40).

The state determination unit 52 inputs from the reference value D and the light amount sensor 74 of the light quantity when the rainwater is buried in the solar panel 10 stored in the fourth recording area 64 when it is larger than the reference value in step S40. The amount of light incident on the solar panel 10 is converted into a digital value through the A / D converter 76 to receive the value stored in the eighth recording area from the controller 51. It is judged whether or not it is larger than this reference value D, and when it is below the reference value, a signal is outputted to the control part 51 to operate the drive device 20, and when it is larger than the reference value, the process proceeds to the next step (step S50).

If the state determination unit 52 is larger than the reference value in step S50, the reference value E and the light amount sensor 74 of the amount of light when the dust accumulates on the solar panel 10 stored in the fifth recording area 65. The amount of light incident on the solar panel 10 input from the digital signal is converted into a digital value through the A / D converter 76 to receive the value stored in the eighth recording area from the controller 51 and enter the solar panel 10. If the amount of light to be determined is greater than or equal to the reference value E, and if the reference value is less than or equal to the reference value, a signal is output to the control unit 51 to operate the driving device 20. .

The control unit 51 sends a signal to the drive unit by a signal to operate the drive unit including the micro motor 21 and the solenoid valve 42 from the state determination unit 52 in steps S30 to S60, and the drive unit is the solenoid valve. (42) is opened to supply the cleaning liquid, and the micro motor 21 is driven to move the washing section 30 from the left side to the right side or from the right side to the left side of the solar panel 10, thereby The surface is washed (step S70).

In step S70, the washing unit 30 moves from the left side to the right side or from the right side to the left side of the solar panel 10, and then contacts the limit switch or the proximity switch 78 installed at the left side or the right side of the solar panel 10. In the proximity, the switch 78 sends a signal to the control unit 51 to send a signal to the drive unit 20 in order to stop the operation of the drive unit from the control unit 51, thereby driving the solenoid 20. The valve 42 is locked, the micromotor 41 is stopped, and the polarity of the power supplied to the micromotor 21 is reversed so that the rotation of the micromotor 21 can be reversed for the next cleaning. The flow then advances to step S30 (step S80). Although the polarity of the power supplied to the micro-motor 21 is changed after washing here, step S70 may be advanced so that it may be changed at the washing start stage, ie, the time of starting a drive unit.

As described above, the process proceeds to step S30 by repeating the process of continuously washing the solar panel 10 unless the contamination such as snow, rain, dust, etc. is completely removed, thereby completely washing the solar panel 10.

In addition, since the step S20 detects the power generation efficiency of the solar panel 10 and proceeds to a later step, the solar panel 10 is not washed when the temperature sensor 72 or the light quantity sensor 74 abnormally operates.

As mentioned above, this invention is not limited to the said Example.

That is, in the above embodiment, the washing unit 30 has been described as washing the upper surface of the solar panel 10 while moving from the left side to the right side or from the right side to the left side of the solar panel 10, but is not limited thereto. The washing unit 30 may wash the upper surface of the solar panel 10 while moving from the upper side to the lower side or the lower side of the solar panel 10.

In addition, although the washing part 30 has the step S20 which wash | cleans when the voltage output from solar cells is not normal, this step S20 may be skipped and the temperature of the solar panel 10 is more than a predetermined temperature. Has a step S30 for operating the drive device, but this step can also be omitted.

In addition, the snow, rain, and dust accumulated on the solar panel 10 was described as a process of washing by the washing unit 30, but it is configured to determine whether the contamination by one light quantity reference value encompassing snow, rain, dust. If it detects snow, rain, and dust through the light quantity sensor, but omits it, and it is lower than the voltage reference value by the output voltage generated from the battery cell, it is considered that snow, rain, and dust have accumulated on the solar panel 10. It can also be configured to judge.

1 is a view showing a washing apparatus of a conventional solar panel,

2 is a view showing the concept of a washing apparatus of a solar panel according to the present invention,

3 is a detailed view of the washing unit in the washing apparatus of the solar panel according to the present invention,

4 is a block diagram for automatically washing the solar panel according to the present invention,

5 is a flow chart for explaining the operation of the washing apparatus of the solar panel according to the present invention;

* Description of the symbols according to the main parts of the drawings *

10: solar panel 20: driving device

21: motor 22, 23, 24, 25: pulley

26, 27: rotating shaft 28: belt

30: washing unit 40: water source

50: microprocessor unit 60: memory unit

Claims (9)

1. A washing unit spraying the cleaning liquid while traveling in contact with the upper surface of the solar panel;

   Cleaning solution supply means for supplying the cleaning solution to the cleaning means;

   In the washing apparatus of the solar panel comprising a washing unit moving means for driving the washing unit from one side of the solar panel to the opposite side while spraying the cleaning liquid in the washing unit to wash the upper surface of the solar panel,

   The washing device is

   A state detecting unit detecting a state of the solar panel related to power generation efficiency of the solar panel;

   A memory unit configured to store a rated output value of the solar panel, a reference value for the temperature of the solar panel, and a reference value for a contaminated state of an upper surface of the solar panel;

   A state determination unit comparing the value input from the state detection unit with a reference value stored in the memory unit;

   A control unit for controlling the washing liquid supply means and the washing unit moving means;

   The controller determines that the cleaning solution supplying means is configured to determine that the output of the solar panel is less than the rated output, the temperature of the solar panel exceeds a reference value, or the upper surface of the solar panel is contaminated. The cleaning apparatus of the solar panel, characterized in that for supplying a cleaning liquid, and controlling to drive the cleaning unit moving means.
2. The method of claim 1,

   The cleaning unit moving means has rollers attached to both ends of the cleaning unit, and guide rails for driving the rollers are installed at sides other than one side and the opposite side of the solar panel, and includes a driving source for driving the cleaning unit. ;

   It further includes a limit switch or a proximity switch installed on one side and the opposite side of the solar panel for detecting the end of the running of the cleaning unit;

   When the cleaning unit contacts or approaches the switch, when the switch sends a driving stop signal to the control unit, the control unit stops the operation of the driving source, and the power supplied to the driving source so that the operation of the driving source is reversed. Washing device for a solar panel, characterized in that for changing the polarity of the.
3. The method of claim 1,

   The cleaning unit has a hollow portion, the cleaning device for a photovoltaic power generation system, characterized in that it comprises a metal tube formed with a nozzle for injecting the cleaning liquid and a brush fixed to the lower portion of the metal tube in contact with the upper surface of the solar panel. .
4. delete
5. The method of claim 1,

   The reference value for the contaminated state of the upper surface of the solar panel stored in the memory unit is a respective reference value for whether the upper surface of the solar panel is contaminated by snow, rain or dust,

   The state determination unit compares each input value input from the state detection unit with each reference value for determining whether it is contaminated by snow, rain or dust stored in the memory unit, and determines the solar power generation system. Washing equipment.
6. A washing unit spraying the cleaning liquid while traveling in contact with the upper surface of the solar panel;

   Washing liquid supply means for supplying the washing liquid to the washing unit;

   Washing unit moving means for driving the washing unit from one side of the solar panel to the opposite side while spraying the washing liquid in the washing unit to wash the upper surface of the solar panel;

   In the washing method of the cleaning apparatus of the solar panel comprising a control unit for controlling the cleaning liquid supply means and the cleaning unit moving means,

   Generating output efficiency detection step of determining whether the output of the solar panel is less than the rated value;

   A temperature comparison step of determining whether a temperature of the solar panel exceeds a reference value when the output of the solar panel is less than a rated output value in the power generation output efficiency detection step;

   A pollution discrimination step of determining whether the upper surface of the solar panel is contaminated if the temperature is less than or equal to a reference value;

   A washing step of moving the cleaning part moving means while the cleaning liquid supplying means supplies the cleaning part to the cleaning part by the control of the controller when it is determined that the upper surface of the solar panel is contaminated in the contamination determining step;

   Method for cleaning a solar panel comprising a.
7. delete
8. The method of claim 6,

   The washing unit moving unit is a cleaning method of a solar panel, characterized in that for driving from one side of the solar panel to the opposite side.
9. The method of claim 8,

   The cleaning unit of claim 1, wherein the washing unit moving to the opposite side after proceeding to the contamination discrimination step.

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