JP2015231280A - Solar cell monitoring device and solar cell monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device for a solar battery and a monitoring system for the solar battery that can detect a fault of the solar battery as properly as possible even when a weather providing a small power generation amount of the solar battery continues.SOLUTION: A monitoring controller 13 determines on the basis of weather information whether fault diagnosis of a solar battery 9 in a diagnosis time zone is possible or not. When the fault diagnosis is determined to be possible, the monitoring controller 13 executes a fault diagnosis for detecting a fault of the solar battery 9 on the basis of power generation data, and when the fault diagnosis is determined to be impossible, the monitoring controller 13 does not execute the fault diagnosis. When a day on which the fault diagnosis is not executed continues and the number of these days exceeds an upper limit number of days, the monitoring controller 13 changes the diagnosis time zone.

Description

  The present invention generally relates to a solar cell monitoring device and a solar cell monitoring system, and more particularly to a solar cell monitoring device and a solar cell monitoring system that perform failure diagnosis.

  In recent years, photovoltaic power generation devices have been in the spotlight from the viewpoint of utilizing natural energy, and have been installed in various places due to increased awareness of energy saving and energy storage.

  For such a solar power generation device, the monitoring device measures the power generation amount of the solar cell (solar cell module) and performs failure diagnosis for detecting a failure of the solar cell based on the power generation amount (for example, patent) References 1 and 2). This conventional monitoring device executes a failure diagnosis of the solar cell when the amount of solar radiation is sufficient, and stops the failure diagnosis of the solar cell when the amount of solar radiation is insufficient due to cloudy weather or the like.

JP 2012-54401 A JP 2012-55090 A

  A conventional monitoring device determines a daily diagnostic time zone in advance, measures the amount of power generated by the solar cell during this diagnostic time zone, and performs fault diagnosis for detecting a solar cell fault based on the generated power. When the weather is raining or cloudy, the power generation amount of the solar cell is small and the accuracy of the failure diagnosis of the solar cell is lowered. Therefore, the monitoring device stops the failure diagnosis.

  However, when rainy weather or cloudy weather with a small amount of power generated by the solar battery continues for days, the failure diagnosis by the monitoring device is not performed for days. That is, when the weather with a small amount of power generation of the solar cell continues for many days, the failure of the solar cell cannot be detected, and the failure of the solar cell is not properly detected.

  The present invention has been made in view of the above-described reasons, and the purpose of the present invention is to monitor a solar cell that can detect a failure of the solar cell as appropriately as possible even in the case of weather in which the amount of power generated by the solar cell is low. It is to provide a device and a solar cell monitoring system.

  The monitoring device for a solar cell according to the present invention performs a fault diagnosis of the first acquisition unit that acquires power generation data related to the power generation amount of the solar cell, a second acquisition unit that acquires weather information regarding the weather, and a failure diagnosis of the solar cell. A first diagnosis time zone is set as a diagnosis time zone, and whether or not failure diagnosis of the solar cell is possible in the first diagnosis time zone is determined based on the weather information, and it is determined that the failure diagnosis is possible In this case, a failure diagnosis for detecting a failure of the solar cell is executed based on the power generation data acquired by the first acquisition unit in the first diagnosis time period, and it is determined that the failure diagnosis is impossible. A monitoring control unit that does not execute the failure diagnosis in the first diagnosis time zone, and the monitoring control unit is configured to perform the diagnosis time when the day on which the failure diagnosis is not executed exceeds a maximum number of days. Before the obi And changing to a different second diagnostic time period from the first diagnosis time zone.

  The solar cell monitoring system of the present invention includes the monitoring device of the present invention and a measuring instrument that generates the power generation data acquired by the first acquisition unit.

  As described above, the present invention has an effect that a failure of a solar cell can be detected as appropriately as possible even in the case where the weather with a small amount of power generated by the solar cell continues.

It is a block diagram which shows the system configuration | structure of embodiment. It is a flowchart which shows the failure diagnosis process of embodiment. It is a flowchart which shows the failure diagnosis process of embodiment. It is explanatory drawing which shows the diagnostic time slot | zone of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a block diagram showing a configuration of a solar cell monitoring system (hereinafter referred to as a monitoring system) using a solar cell monitoring device 1 (hereinafter referred to as a monitoring device 1).

  The monitoring system includes a monitoring device 1 and a measuring instrument 2 as main components, and the monitoring device 1 performs a failure diagnosis for detecting a failure of the solar cell 9. Furthermore, the monitoring system preferably includes a weather server 3 and a notification terminal 4.

  The solar cell 9 is installed on a detached house, an apartment house, a rooftop of a building, a garden, or the like, and is composed of a plurality of solar cell modules. The solar cell 9 generates direct-current power by irradiating the panel with sunlight, and outputs the generated direct-current power to the power conditioner 8. The power conditioner 8 converts the DC power output from the solar cell 9 into AC power and supplies the AC power to the power system 7. The electric power system 7 is an electric power path for supplying electric power to an electric device (not shown), and is configured by a commercial electric power system, for example.

  In FIG. 1, the monitoring system includes a plurality of sets of a power conditioner 8 and solar cells 9, and the monitoring device 1 sets each of the plurality of solar cells 9 as a target of failure diagnosis.

  The monitoring device 1 includes a first acquisition unit 11, a second acquisition unit 12, a monitoring control unit 13, and a notification unit 14. The monitoring device 1 preferably further includes a shadow data storage unit 15.

  The measuring instrument 2 includes a measuring unit 21 and a current detector 22. The current detector 22 is provided corresponding to each of the plurality of solar cells 9 and measures the output current of each of the solar cells 9. The measurement unit 21 measures the generated power of each of the solar cells 9 based on the measurement value of the current detector 22, generates power generation data based on the measurement result, and outputs the generated power data to the first acquisition unit 11. The measuring unit 21 is housed in the monitoring device 1, but may be provided outside the monitoring device 1. The measuring instrument 2 may be configured to measure the output power of each of the plurality of power conditioners 8.

  The first acquisition unit 11 acquires (receives) the power generation data generated by the measuring instrument 2.

  The second acquisition unit 12 is connected to a wide area network 100 such as the Internet via a router or the like (not shown). The weather server 3 is connected to the wide area network 100, and the weather server 3 can store the weather information related to the weather and distribute the weather information via the wide area network 100. The second acquisition unit 12 can access the weather server 3 and acquire (receive) weather information from the weather server 3.

  The weather information is information related to the weather for each region (for example, for each municipality). The weather server 3 holds in advance information (address, region, etc.) relating to the installation location of the monitoring device 1 that is permitted to access in association with identification information (IP address, etc.) of the monitoring device 1. Therefore, the weather server 3 can distribute the weather information corresponding to the installation location (address, region, etc.) of the access source monitoring device 1 to the monitoring device 1.

  Further, the weather information includes information on current weather and forecast information on future weather. The current weather information is information such as the current amount of solar radiation and temperature. The forecast information relating to the future weather is forecast information such as the amount of solar radiation and temperature from the present to an arbitrary time in the future, and the forecast period is set according to an instruction from the monitoring device 1. In addition, the information on the amount of solar radiation and the temperature can be substituted with weather information such as sunny weather, cloudy weather, and rainy weather.

  The monitoring control unit 13 performs failure diagnosis for detecting a failure of the solar cell 9 based on the power generation data acquired by the first acquisition unit 11 and the weather information acquired by the second acquisition unit 12.

  A notification terminal 4 that can be operated by a monitor such as an end user, an administrator, or a management company of the solar battery 9 is also connected to the wide area network 100, and the monitoring device 1 can communicate with the notification terminal 4. become. The notification terminal 4 includes a configuration in which a personal computer and a dedicated terminal are used, and a configuration in which a portable information terminal such as a mobile phone, a smartphone, and a tablet is used, and any configuration may be used.

  The notification unit 14 is connected to a wide area network 100 such as the Internet via a router or the like (not shown), and can transmit a result of failure diagnosis of the solar cell 9 by the monitoring control unit 13 to the notification terminal 4. The notification terminal 4 displays the result of failure diagnosis received from the monitoring device 1 on the screen, and also performs voice notification if necessary.

  Hereinafter, failure diagnosis of the solar cell 9 by the monitoring device 1 will be described using the flowcharts of FIGS. 2 and 3. The failure of the solar cell 9 includes deterioration of the solar cell 9, a state where foreign matter is present on the panel surface of the solar cell 9, and the like.

  First, the monitoring control unit 13 basically performs a failure diagnosis process for the solar cell 9 every day. And the monitoring control part 13 has determined the diagnostic time zone which is a time zone which performs failure diagnosis of the solar cell 9, and sets the diagnostic time zone set by default as the diagnostic time zone T1 (first diagnostic time zone). ). This diagnosis time zone T1 is set, for example, to a time zone including the southern sky time, or from 11:30 to 12:30 in the daytime (see FIG. 4), and the second acquisition unit 12 The information of T1 is read from a memory (not shown) provided in the monitoring control unit 13 (S1). Then, when the current time reaches the start time of the diagnosis time zone T1 (S2), the second acquisition unit 12 acquires the weather information of the diagnosis time zone T1 (S3). In the diagnosis time zone T1, it is preferable that no shadow is generated on the panel surface of the solar cell 9.

  The monitoring control unit 13 determines whether or not failure diagnosis of the solar cell 9 in the diagnosis time zone T1 is possible based on the weather information in the diagnosis time zone T1 (S4). It is preferable that the monitoring controller 13 determines whether or not failure diagnosis of the solar cell 9 is possible in the diagnosis time period T1 based on at least information on the amount of solar radiation.

  Specifically, the monitoring control unit 13 estimates the power generation amount (estimated power generation amount) of the solar cell 9 in the diagnosis time zone T1 based on the information on the solar radiation amount and the temperature, and calculates the estimated power generation amount in the diagnosis time zone T1. Pa (T1). Here, the amount of power generated by the solar cell 9 is the amount of power generated by the solar cell 9. In general, the amount of power generated by the solar cell 9 depends on the amount of solar radiation and the temperature. The amount of power generation increases as the amount of solar radiation increases and the temperature decreases. Then, the monitoring control unit 13 determines whether or not the estimated power generation amount Pa (T1) is equal to or greater than the threshold value K1. The threshold value K1 is set to the minimum power generation amount that the solar cell 9 can stably generate power, and is set according to the rated output, type, and the like of the solar cell 9. Then, the monitoring control unit 13 determines that failure diagnosis is possible if the estimated power generation amount Pa (T1) is equal to or greater than the threshold value K1. In addition, it is preferable that the monitoring control part 13 estimates the electric power generation amount of the solar cell 9 in consideration of each condition of the installation direction and installation angle of the solar cell 9 and shadow information described later.

  When the monitoring control unit 13 determines that the failure diagnosis in the diagnosis time zone T1 is possible, the power generation amount (measured power generation amount) in the diagnosis time zone T1 is calculated based on the power generation data acquired by the first acquisition unit 11. Measurement is performed (S5), and this measured power generation amount is defined as Pb (T1).

  Then, the monitoring control unit 13 performs failure diagnosis based on the actually measured power generation amount Pb (T1) (S6). Specifically, the monitoring controller 13 compares the actually measured power generation amount Pb (T1) with the threshold value K2. The monitoring control unit 13 determines that the solar cell 9 is normal if the measured power generation amount Pb (T1) is equal to or greater than the threshold value K2, and if the measured power generation amount Pb (T1) is less than the threshold value K2, the solar cell 9 is determined. Is determined to be malfunctioning. The threshold value K2 is set to, for example, the estimated power generation amount Pa (T1) or a value obtained by multiplying the estimated power generation amount Pa (T1) by a constant less than 1.

  The notification unit 14 performs a notification process for transmitting the result of the failure diagnosis by the monitoring control unit 13 to the notification terminal 4 (S7). The notification terminal 4 displays the received failure diagnosis result on the screen, and performs voice notification if necessary.

  Further, if the monitoring control unit 13 determines in step S4 that the estimated power generation amount Pa (T1) is less than the threshold value K1 and failure diagnosis in the diagnosis time zone T1 is impossible, the diagnosis control in the diagnosis time zone T1 is performed. Do not execute. However, when rainy and cloudy weather continues and days when failure diagnosis is impossible in the diagnosis time period T1 continue for many days, failure monitoring by the monitoring control unit 13 is not performed for many days.

  Therefore, the monitoring control unit 13 determines whether or not the day (diagnosis stop date) on which the failure diagnosis in the diagnosis time period T1 is impossible has continued beyond the upper limit number of days (S8). Then, when the duration of the diagnosis stop date is equal to or less than the upper limit number of days, the monitoring control unit 13 ends the failure diagnosis process on the current day and restarts the failure diagnosis process on the next day. The upper limit number of days is arbitrarily determined, and the specific number of days is not limited. Moreover, you may set an upper limit day separately for every solar cell 9 to be diagnosed.

  On the other hand, the monitoring control unit 13 performs a resetting process for setting a new diagnosis time zone during the day in order to retry the failure diagnosis during the day when the number of days for which the diagnosis is stopped exceeds the upper limit number of days. (S9).

  FIG. 3 shows a flowchart of the resetting process.

  In the resetting process, the monitoring control unit 13 preferably reads the shadow data from the shadow data storage unit 15 (S11). Shadow data is data indicating the time transition of the occurrence of shadows at the place where the solar cell 9 is installed. The sun data is taken into account in consideration of the sunrise time, sunset time, solar altitude, arrangement of surrounding buildings and structures, etc. The time change of the shadow which covers the panel surface of the battery 9 is shown. Since the occurrence state of the shadow varies depending on the season, the shadow data indicates the time transition of the occurrence state of the shadow over one year. The monitoring control unit 13 has a calendar function, and reads shadow data corresponding to the date of the day from the shadow data storage unit 15. In addition, since the situation of surrounding buildings and structures may change, it is preferable to regularly update shadow data by external writing or the like.

  Then, based on the shadow data, the monitoring control unit 13 is a time zone in which the panel surface of the solar cell 9 is not covered with shadow over the same time length as the diagnostic time zone T1 after the diagnostic time zone T1 of the day. (Candidate time zone) is extracted (S12). In addition, the time slot | zone when the panel surface of the solar cell 9 is not covered with a shadow is a time slot | zone when more than the predetermined ratio of the panel surface of the solar cell 9 is not covered with a shadow. And the monitoring control part 13 determines the presence or absence of a candidate time slot | zone (S13). If there is no candidate time zone, the monitoring control unit 13 ends the failure diagnosis process on the current day and restarts the failure diagnosis process on the next day.

  If there is a candidate time zone, the monitoring control unit 13 sets the candidate time zone closest to the current time as a new diagnostic time zone T2 (second diagnostic time zone) (S14) (see T21 in FIG. 4). Then, when the current time is in the diagnosis time zone T2 (S15), the second acquisition unit 12 acquires weather information in the diagnosis time zone T2 (S16).

  The monitoring control unit 13 determines whether or not failure diagnosis of the solar cell 9 in the diagnosis time zone T2 is possible based on the weather information in the diagnosis time zone T2 (S17). Specifically, the monitoring control unit 13 estimates the power generation amount (estimated power generation amount) of the solar cell 9 in the diagnosis time zone T2 based on the information on the solar radiation amount and the temperature, and calculates the estimated power generation amount in the diagnosis time zone T2. Pa (T2). Then, the monitoring control unit 13 determines whether or not the estimated power generation amount Pa (T2) is equal to or greater than the threshold value K1. Then, the monitoring control unit 13 determines that failure diagnosis is possible if the estimated power generation amount Pa (T2) is equal to or greater than the threshold value K1.

  When the monitoring control unit 13 determines that the failure diagnosis in the diagnosis time zone T2 is possible, the power generation amount (measured power generation amount) in the diagnosis time zone T2 is determined based on the power generation data acquired by the first acquisition unit 11. Measurement is performed (S18), and this actually measured power generation amount is defined as Pb (T2).

  Then, the monitoring control unit 13 performs failure diagnosis based on the actually measured power generation amount Pb (T2) (S19). Specifically, the monitoring control unit 13 compares the actually measured power generation amount Pb (T2) with the threshold value K3. The monitoring control unit 13 determines that the solar cell 9 is normal if the measured power generation amount Pb (T2) is equal to or greater than the threshold value K3, and if the measured power generation amount Pb (T2) is less than the threshold value K3, the solar cell 9 is determined. Is determined to be malfunctioning. The threshold value K3 is set to, for example, the estimated power generation amount Pa (T2) or a value obtained by multiplying the estimated power generation amount Pa (T2) by a constant less than 1.

  The notification unit 14 performs a notification process for transmitting the result of the failure diagnosis by the monitoring control unit 13 to the notification terminal 4 (S20). The notification terminal 4 displays the received failure diagnosis result on the screen, and performs voice notification if necessary.

  If the monitoring control unit 13 determines in step S17 that failure diagnosis in the diagnosis time period T2 is impossible, the monitoring control unit 13 does not execute failure diagnosis in the diagnosis time period T2, and returns to step S11 to perform resetting processing. Start again. And if there exists a candidate time slot | zone, the monitoring control part 13 will set the candidate time slot | zone nearest to the present | current time to the new diagnostic time slot | zone T2 (refer T22 of FIG. 4), and will perform the same process as the above.

  That is, the monitoring device 1 described above includes a first acquisition unit 11, a second acquisition unit 12, and a monitoring control unit 13. The first acquisition unit 11 acquires power generation data related to the power generation amount of the solar cell 9. The second acquisition unit 12 acquires weather information related to the weather. The monitoring control unit 13 sets a diagnosis time zone T1 (first diagnosis time zone) as a diagnosis time zone in which the failure diagnosis of the solar cell 9 is performed, and the failure of the solar cell 9 in the diagnosis time zone T1 based on the weather information. Determine whether diagnosis is possible. When the monitoring control unit 13 determines that the failure diagnosis is possible, the monitoring control unit 13 executes a failure diagnosis that detects a failure of the solar cell 9 based on the power generation data acquired by the first acquisition unit 11 in the diagnosis time period T1. To do. Further, when the monitoring control unit 13 determines that the failure diagnosis is impossible, the monitoring control unit 13 does not execute the failure diagnosis in the diagnosis time period T1. Then, when the day when failure diagnosis is not performed exceeds the upper limit number of days, the monitoring control unit 13 changes the diagnostic time zone to a diagnostic time zone T2 (second diagnostic time zone) different from the diagnostic time zone T1. .

  Therefore, the monitoring device 1 changes the diagnostic time zone from the diagnostic time zone T1 to the diagnostic time zone T2 when the weather (rainy weather, cloudy weather, etc.) with a small amount of power generated by the solar battery 9 continues, and thus performs a fault diagnosis. Can increase opportunities to do. That is, the monitoring device 1 can detect the failure of the solar cell 9 as appropriately as possible even when the weather with a small amount of power generated by the solar cell 9 continues. Furthermore, since the monitoring device 1 does not transmit a failure diagnosis result with low accuracy to the notification terminal 4, communication traffic can be suppressed.

  Moreover, it is preferable that the monitoring control unit 13 determines whether or not failure diagnosis of the solar cell 9 is possible in the diagnosis time zone T2 (second diagnosis time zone) based on weather information. When the monitoring control unit 13 determines that the failure diagnosis is possible, the monitoring control unit 13 executes the failure diagnosis in the diagnosis time zone T2. When the monitoring control unit 13 determines that the failure diagnosis is impossible, the monitoring control unit 13 further sets the diagnosis time zone T2. Change to time zone.

  Therefore, the monitoring device 1 can set a diagnosis time zone T2 suitable for failure diagnosis.

  Moreover, it is preferable that the monitoring apparatus 1 is provided with the shadow data storage part 15 which stored the shadow data which shows the time transition of the generation | occurrence | production state of the shadow in the installation place of the solar cell 9. FIG. In this case, the monitoring control unit 13 sets a time zone in which no shadow is generated at the installation location of the solar cell 9 as a diagnostic time zone T2 (second diagnostic time zone).

  In the solar cell 9, the amount of power generation decreases as the proportion of shadows generated on the panel surface increases. Therefore, if the ratio of the shadow generated on the panel surface of the solar cell 9 is large, the power generation amount of the solar cell 9 can be suppressed even when the conditions of the amount of solar radiation and the temperature are favorable. This makes it difficult to diagnose failures. Therefore, the monitoring device 1 can perform accurate failure diagnosis by setting a time zone in which the ratio of shadows generated on the panel surface of the solar cell 9 is small as the diagnostic time zone T2.

  The weather information preferably includes information on the amount of solar radiation applied to the solar cell 9. In this case, the monitoring control unit 13 determines whether failure diagnosis is possible based on at least the amount of solar radiation.

  Since the solar cell 9 increases the amount of power generation as the amount of solar radiation to be irradiated increases, a more accurate failure diagnosis becomes possible as the amount of solar radiation increases. Therefore, the monitoring device 1 can accurately determine whether or not failure diagnosis is possible by determining whether or not failure diagnosis is possible based on at least the amount of solar radiation.

  In addition, when the day on which failure diagnosis is not performed exceeds the upper limit number of days, the monitoring control unit 13 predicts a day on which failure diagnosis is possible based on weather information, and the notification unit 14 relates to the predicted date. It is preferable to transmit information to the outside.

  Specifically, when the day when failure diagnosis is not performed exceeds the upper limit number of days, the second acquisition unit 12 accesses the weather server 3 and receives long-term weather information from the weather server 3 (for example, from one week to Long-term forecast information until 3 weeks later). And the monitoring control part 13 estimates the generation | occurrence | production condition of the day (diagnosis possible day) when the electric power generation amount of the solar cell 9 becomes more than threshold value K1 based on each long-term forecast information of solar radiation amount and temperature. Then, the notification unit 14 transmits the prediction result of the diagnosis possible date by the monitoring control unit 13 to the notification terminal 4. The notification terminal 4 displays the received diagnosis possible date prediction result on the screen, and also performs voice notification if necessary.

  Therefore, the end users, the managers, the managers, etc. of the solar battery 9 can grasp in advance the days when the probability that the fault diagnosis can be performed is high. In other words, the monitoring device 1 can give the monitor a sense of security even when days when failure diagnosis cannot be performed continue.

  Moreover, the above-mentioned monitoring system is provided with the monitoring apparatus 1 and the measuring device 2 which produces | generates the electric power generation data which the 1st acquisition part 11 acquires.

  Therefore, the monitoring system can detect the failure of the solar cell 9 as appropriately as possible even when the weather with a small amount of power generated by the solar cell 9 continues.

  In the above-described monitoring system, the measuring instrument 2 generates power generation data for each of the plurality of solar cells 9, and the monitoring control unit 13 of the monitoring device 1 determines whether each of the plurality of solar cells 9 has a failure. It is preferable to do. In this case, the monitoring system can detect each failure of the plurality of solar cells 9 as appropriately as possible.

  Moreover, the monitoring control part 13 acquires the information of the solar radiation amount irradiated to the panel surface of the solar cell 9 based on weather information, and compares the solar radiation amount irradiated to the panel surface of the solar cell 9 with a threshold value. Thus, the possibility of failure diagnosis of the solar cell 9 may be determined. In this case, the monitoring control unit 13 determines that failure diagnosis is possible if the amount of solar radiation is equal to or greater than the threshold value. Further, the monitoring control unit 13 may correct the solar radiation amount with the temperature (for example, multiply the solar radiation amount by a coefficient proportional to the air temperature), and compare the corrected solar radiation amount with a threshold value.

  Further, the monitoring control unit 13 uses the power generation amount (estimated power generation amount and actual power generation amount) used for the failure diagnosis process of the solar cell 9 as the power generation amount in the diagnosis time zone, the average value of the power generation in the diagnosis time zone, and the diagnosis time. Any peak value of the generated power in the band may be used. That is, the power generation amount may be in the form of a time integral value, an average value, or a peak value of the generated power of the solar cell 9, and the threshold value to be compared with the power generation amount is set according to the form of the power generation amount.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

DESCRIPTION OF SYMBOLS 1 Monitoring apparatus 11 1st acquisition part 12 2nd acquisition part 13 Monitoring control part 14 Notification part 15 Shadow data memory | storage part 2 Measuring instrument 3 Weather server 4 Notification terminal 7 Electric power system 8 Power conditioner 9 Solar cell

Claims (7)

A first acquisition unit for acquiring power generation data relating to the power generation amount of the solar cell;
A second acquisition unit for acquiring weather information about the weather;
A first diagnosis time zone is set as a diagnosis time zone for performing a failure diagnosis of the solar cell, and it is determined whether or not the failure diagnosis of the solar cell in the first diagnosis time zone is possible based on the weather information, If it is determined that a failure diagnosis is possible, a failure diagnosis is performed to detect a failure of the solar cell based on the power generation data acquired by the first acquisition unit in the first diagnosis time period, and the failure When it is determined that diagnosis is impossible, a monitoring control unit that does not execute the failure diagnosis in the first diagnosis time zone,
The monitoring control unit changes the diagnostic time zone to a second diagnostic time zone different from the first diagnostic time zone when a day when the failure diagnosis is not performed exceeds the upper limit number of days. Solar cell monitoring device.   The monitoring control unit determines whether or not the failure diagnosis of the solar cell in the second diagnosis time zone is possible based on the weather information, and determines that the failure diagnosis is possible, the second diagnosis time 2. The solar cell according to claim 1, wherein when the failure diagnosis is performed in a band and it is determined that the failure diagnosis is impossible, the second diagnosis time zone is changed to another time zone. Monitoring device. A shadow data storage unit storing shadow data indicating a time transition of the occurrence state of the shadow at the installation location of the solar cell;
The solar cell monitoring device according to claim 1, wherein the monitoring control unit sets a time zone in which no shadow is generated at the installation location of the solar cell as the second diagnostic time zone.   4. The weather information includes information on an amount of solar radiation applied to the solar cell, and the monitoring control unit determines whether or not the failure diagnosis is possible based on at least the amount of solar radiation. The monitoring apparatus of the solar cell in any one. It has a notification unit that communicates with the outside,
When the day when the failure diagnosis is not performed exceeds the upper limit number of days, the monitoring control unit predicts the day on which the failure diagnosis is possible based on the weather information, and the notification unit predicts this The information regarding a day is transmitted to the said outside. The monitoring apparatus of the solar cell in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.   A monitoring system for a solar cell, comprising: the monitoring device according to claim 1; and a measuring instrument that generates the power generation data acquired by the first acquisition unit. The said measuring device produces | generates the said electric power generation data of each of the said several solar cell, The said monitoring control part of the said monitoring apparatus determines the presence or absence of each failure of the said some solar cell, It is characterized by the above-mentioned. Item 7. The solar cell monitoring system according to Item 6.

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