10 On-site Checks for Low Power Output | How to Isolate the Causes

Table of Contents

• When power generation is low, the order of on-site checks is important

• On-site check 1: Use power generation data to identify the time periods of decreased output

• On-site check 2: Narrow down the abnormal range by comparing with equipment under the same conditions

• On-site check 3: Isolate weather, solar irradiance conditions, and seasonal variation

• On-site check 4: Check for dirt and deposits on the panel surfaces

• On-site check 5: Check for shading from weeds, trees, and structures

• On-site check 6: Check generation differences at the string level

• On-site check 7: Inspect connection points, cables, and wiring routes

• On-site check 8: Check the shutdown history of power conversion equipment and any output curtailment

• On-site check 9: Check for temperature rise, poor ventilation, and the equipment's surrounding environment

• On-site check 10: Identify recurrence factors from drainage, topography, and inspection records

• Approach to improving power generation after isolating causes

• Summary

When power output is low, the order of on-site checks is important

When you feel the power output of a solar power generation system is low, the first important thing is not to assume a single cause. Even in situations where output has dropped, is not rising as expected, or is lower than the same month of the previous year, the cause varies by site. Dirt on the panel surface, bird droppings and fallen leaves, shading from weeds or trees, abnormalities at the string level, faults in connections, cable damage, shutdown of conversion equipment, output curtailment, temperature rise, poor drainage, and other factors can combine to reduce generation.

To increase power output, you should not try to increase the solar irradiance itself, but aim to convert the received solar irradiance into electricity with as little waste as possible. In practical terms, improving power output means finding where the electricity that should be generated is being lost and taking measures to reduce those generation losses. If you decide on countermeasures based only on visible dirt or weeds at the site, you can miss the actual causes, and cleaning or weeding may not restore the power output.

A common pitfall during on-site inspections is addressing abnormalities in the order of their appearance. Cleaning the panels because they are dirty, removing weeds because the grass has grown, or suspecting the equipment because it looks old—such judgments are necessary in some situations. However, if the main cause of reduced power generation is brief stoppages of the conversion equipment or faults in connection points, cleaning alone will not provide sufficient improvement. Conversely, even if you suspect the equipment, the actual cause may be shadows cast by weeds in the morning and evening.

Therefore, when power generation is low, it is important to establish the order of on-site inspections and isolate the causes. First, use power generation data to check when, at which equipment, and what kind of decline is occurring. Next, distinguish whether the variation is a natural change due to weather or season, or a generation loss that can be improved on-site. Then, in order, check the panel surfaces, shading, strings, connection points, conversion equipment, thermal environment, drainage, and inspection records. Having this process increases the accuracy of on-site checks and makes it easier to select measures that will improve power generation.

On-site Check 1: Verify the time periods showing declines in power generation data

When power generation is low, the first thing to check is the generation data, not the panels on site. If you only look at monthly or annual generation figures, you can't tell when the generation loss is occurring. Even if the overall generation is similarly low, the possible causes differ depending on whether it's low only in the morning, the midday peak fails to develop, it drops early in the evening, or there's a sudden dip during the daytime.

If morning generation is low, shadows from trees on the east or southeast, slopes, weeds, surrounding structures, or adjacent equipment may be involved. If it is low in the evening, check shadows on the west or southwest, surrounding terrain, and tree growth. If the midday peak does not reach expected levels, possible causes include dirt on the panel surface, temperature rise, limitations of the power conversion equipment, output curtailment, equipment shutdowns, or string-level abnormalities. If the generation curve suddenly drops during a sunny day, it is necessary to cross-check the power conversion equipment’s shutdown history and alarm logs with the time.

When reviewing power generation data, use the generation curve from sunny days as the baseline whenever possible. On cloudy or rainy days, generation can fluctuate significantly due to cloud movement, making it difficult to determine whether an issue is caused by equipment abnormalities or by weather. If the sunny-day data shows a drop at the same time slot every time, fixed shading or equipment-side limitations become more suspect. If the generation curve does not rise smoothly and shows unnatural dips or plateaus, you should raise the priority of an on-site inspection.

It is important to align the timing of on-site inspections with the power generation data. If generation is low in the morning, visiting the site only at noon won’t allow you to confirm morning shadows. If a site’s output drops in the evening, you need to check evening shadows and the surrounding terrain, or you may overlook the cause. By identifying the time of the drop from the generation data before going to the site, you can reduce wasted inspections and narrow down the cause more quickly.

On-site Inspection 2: Narrow Down the Range of Abnormalities by Comparing with Equipment under Identical Conditions

To identify the cause of low power output, the total value for the entire power plant alone is insufficient. Even if there appears to be no major anomaly at the plant level, it may be that only certain rows, certain strings, or the sections connected to certain conversion devices have low output. Such partial generation losses may be inconspicuous in monthly totals, but if they persist over a long period they can result in significant losses.

When comparing, it is important to look at installations under the same conditions. If you simply compare installations that differ in orientation, tilt, number of panels, shading conditions, or connection configuration, you may misinterpret normal differences as abnormalities. The purpose of comparison is to find locations that consistently have lower power generation among installations that should have similar output. If, compared with adjacent rows or installations with the same orientation, only a specific area is lower, suspect localized soiling, partial shading, connection faults, cable damage, or abnormalities in the power conversion equipment.

When comparing systems under the same conditions, we also check whether a difference in power output is temporary or persistent. If the difference appears on only one day, it may be caused by clouds, a temporary shadow, fallen leaves, or similar factors. If the same area is lower on multiple sunny days, it is more likely that there is a persistent cause on site. If the same string or the area connected to the same power conversion equipment is low every time, we give on-site inspection a higher priority.

After narrowing the anomaly range, it is also important to ensure the exact location can be identified on site. On sites where equipment numbers or row numbers are hard to read, even if an anomaly is detected in the data, it can take time to find it on site. A photo alone may not convey the location. When improving power generation, being able to share the precise location among stakeholders is as important as finding the anomaly.

On-site Check 3: Distinguish Weather, Solar Radiation Conditions, and Seasonal Variations

When you feel power generation is low, before suspecting equipment failure you should separate out the effects of weather, solar irradiance conditions, and seasonal differences. Solar power generation is strongly affected by the amount of sunlight, so during extended cloudy or rainy periods output will drop even if there is no equipment problem. If you compare only monthly generation with the same month of the previous year or with the previous month and immediately conclude there is an equipment fault, it may turn out that differences in weather were the main cause.

On the other hand, we must avoid overlooking real anomalies by attributing them to the weather. If the entire power plant is declining uniformly in line with regional weather, the influence of solar irradiance conditions is likely significant. However, if only part of the plant is underperforming while other equipment within the same plant is operating normally, or if there is a clear discrepancy compared with equipment under the same conditions, the weather alone cannot explain it. In such cases, it is necessary to check on-site causes such as soiling, shading, connection issues, equipment outages, and output curtailment.

To distinguish between weather-related causes and equipment-side causes, compare sunny days with other sunny days or days with similar weather. On cloudy or rainy days, power generation fluctuates greatly, making it difficult to discern the characteristics of anomalies. By checking the generation curve on sunny days, you can more easily find shadows that drop at the same time each day, string anomalies where only specific equipment shows low output, and device shutdowns that cause drops for only a certain period. It is important not to isolate only days with low generation, but to compare them with days under similar conditions.

Seasonal differences are also a major factor to consider. In winter, the sun’s altitude is lower, and shadows from surrounding trees and slopes tend to extend further. In summer, while solar radiation is stronger, panel temperatures and temperatures around equipment rise, which can make it harder for output to increase. During periods with heavy rainfall, monthly power generation tends to be lower, and after strong winds or heavy rain you should also pay attention to fallen leaves, sediment, deposits, poor drainage, and the condition around cables.

By making this distinction, you can reduce unnecessary measures. If the weather is the primary cause, cleaning or repairs will not significantly improve power generation. Conversely, if a particular area remains low even on sunny days, there is a high likelihood that on-site improvements are possible. By separating natural variability from equipment-related problems before on-site inspection, it becomes easier to correctly prioritize measures.

On-site Inspection 4: Check for Dirt and Deposits on the Panel Surface

One of the easiest things to check on site is dirt and deposits on the panel surface. Because solar panels generate electricity by receiving sunlight on their surface, when dirt builds up the light reaching the cells is reduced. The type of soiling varies with the site environment: soil dust, pollen, yellow sand, bird droppings, fallen leaves, sap, dust from nearby construction, road-derived dust, and salt-containing deposits that tend to adhere along coastlines. Even light soiling spread over a wide area can affect power generation, and localized deposits can act as strong shading even if they cover only a small area.

Particular attention should be paid to the band-like dirt that remains on the lower edges of panels and around the frames. It is often assumed that rain will wash it away naturally, but in reality the flow of rainwater can collect dirt at the lower edge and leave it there. On panels with a gentle tilt, water does not drain well and dirt tends to accumulate. Even dirt that is not noticeable from a distance can affect power generation if it covers part of a cell. During on-site inspections, it is necessary to carefully check not only the overall coloration of the panels but also the lower edges, corners, and areas around the frames.

Localized deposits such as bird droppings or fallen leaves should not be overlooked. Unlike dirt that spreads thinly across the entire surface, these cover specific spots densely and hinder power generation by creating partial shading. Rows close to trees, areas around structures where birds tend to perch, leeward rows, and locations near unpaved walkways are more prone to dirt and deposits. If only certain installations show lower power output, focus on inspecting the panel surfaces around those installations.

When deciding whether to clean, check whether the soiling matches the areas of reduced power output. If equipment with low power output overlaps with areas where soiling is noticeable, cleaning should be given high priority. Conversely, if soiling is visible but does not match the areas of reduced output, you should check for other causes such as shading, connections, power conversion equipment, or temperature conditions.

When cleaning, it is essential not to damage the equipment. Avoid vigorously scrubbing with hard tools, performing sudden work during periods when the panels are hot, or omitting safety checks for electrical equipment. If you record before-and-after photos, the work scope, weather conditions, and changes in power generation, it will be easier to determine how much the dirt affected power output.

On-site Inspection 5: Check for Shadows from Weeds, Trees, and Structures

When power generation is low, one thing you should always check is the effect of shadows. Solar panels generate electricity by receiving sunlight, so even if only part of a panel is shaded, output can decrease. Causes of shading include weeds, trees, fences, support posts, surrounding buildings, mounting structures, adjacent rows of panels, monitoring equipment, and other factors. Because shadows move with the time of day and season, the absence of visible shading at the time of inspection does not necessarily mean there is no problem.

Weeds are a common cause of shading on site. Even if there is no problem in winter or immediately after installation, they can grow rapidly from spring into summer and cast shadows on the lower edges of panels and the front row. Even if the vegetation does not touch the panels, shadows become long at the low sun angles in the morning and evening. Furthermore, when weeds become overgrown, airflow is reduced, inspection walkways become blocked, and it becomes more difficult to check around equipment. Because it affects not only power generation but also maintainability, weed management is important.

Shading from trees is also a factor that can become problematic during long-term operation. Trees that had little impact at the time of installation can grow over several years and reduce power generation. Trees located on the south, east, and west sides in particular cast shadows on the panels depending on the time of day. At power plants near forests or slopes, the height of the terrain combined with tree height can create long shadows in winter. If generation is low only in winter, or if there is a large drop in the mornings and evenings, it is necessary to check both the trees and the terrain together.

When checking shadows, it is important to inspect the site at the times when power generation data shows a drop. If output is low in the morning, check the site in the morning; if low in the evening, observe the shadows in the evening. Even if there are no issues at noon, there may be significant shadows in the morning or evening. Also, even if there are no problems in summer, the sun’s elevation is lower in winter, and the same structures can cast much longer shadows. Recording the times shadows occur, their sources, and the equipment affected by the shadows makes it easier to decide on countermeasures.

Pay attention to shadows from nearby structures and additional equipment. Newly installed posts, signs, fences, monitoring devices, and the like can cast shadows depending on the time of day. During site inspections, you need to consider not only the shadows you can see now but also from which directions shadows enter during periods when power generation drops. When you find shadows, implement measures appropriate to the cause, such as weed removal, pruning, repositioning, or adjusting inspection timing.

On-site Inspection 6: Verify string-level power generation differences

The cause of low power generation does not necessarily appear uniformly across the entire plant. If only some strings have reduced output, it might not look like a significant anomaly in total generation, but it will continue to cause generation losses over a long period. To improve power generation, it is important to check for generation differences at the string level and not overlook localized anomalies.

When checking for anomalies at the string level, compare strings that are under the same conditions. If you simply compare strings that differ in panel count, azimuth, tilt, shading conditions, or connection configuration, you may mistakenly interpret normal differences as abnormalities. Check whether any string is consistently lower compared to adjacent columns or strings with the same orientation. If only a specific string is low, possible causes include dirt, partial shading, poor connections, cable damage, panel defects, or issues on the power conversion equipment side.

Pay attention to how differences in power output appear. If output is consistently lower than surrounding systems even on sunny days, dirt, degradation, or poor connections may be suspected. If it is lower only in the morning and evening, check for shading. If anomalies tend to occur after rain, moisture ingress or the condition around connection points may be involved. If it becomes unstable during periods of high temperature, poor contact or the temperature environment are also possible causes. Combining the power output waveform with on-site conditions makes it easier to narrow down the cause.

If a string discrepancy is found, it is necessary to accurately pinpoint the relevant location on site. At sites where equipment numbers or row numbers are hard to decipher, even if an anomaly is detected in the data it can take time to reach the corresponding location on site. If photos, location information, equipment numbers, and power generation data are managed together, stakeholders can more easily confirm the same location.

String-level anomalies can be caused not only by dirt or shading but can also lead to faults in connection points or cables. Even small differences in power output can result in significant losses if they persist day after day. Furthermore, if electrical abnormalities are involved, safety considerations are also necessary. Instead of on-site staff forcibly touching the connection points, they should organize the anomaly location, time of occurrence, changes in power output, on-site photos, and surrounding environment, and, when necessary, arrange for a professional inspection.

On-site Inspection 7: Verify connection points, cables, and wiring routes

If the panels are clean and there is little shading but the power output is low, you need to check for abnormalities in the connections, cables, and wiring routes. Even if the solar panels are generating properly, a fault in the path that extracts the electricity can prevent you from retrieving the generated power fully. Loose terminals, poor contact, damage to cable sheathing, moisture ingress, damage by animals, damage during mowing, and age-related deterioration can all lead to reduced power output.

Connection or cable faults are suspected when only certain equipment shows low power generation, when output becomes unstable after rain, when power output suddenly drops, or when output fluctuates irregularly. If some sections produce lower output despite no visible dirt or shading, electrical faults should also be considered. If there is a persistent difference compared with a string under the same conditions, prioritize inspecting the connection points and cables.

Cable routing is an area that is easily affected by surrounding environmental conditions. When weeds are overgrown, cables can become difficult to see, and damage or deterioration may be overlooked. In areas with poor drainage, moisture and standing water can affect connection points. In locations susceptible to animal intrusion, cable damage can also occur. If power output changes after grass-cutting work, inspect for possible contact or damage that may have occurred during the work.

Safety should be the top priority when inspecting electrical equipment. Even if the goal is to improve power generation, on-site personnel should avoid forcibly touching connection points or the interior of equipment to make assessments. First, compile the equipment suspected of being faulty, the time of occurrence, changes in power output, on-site photos, and the surrounding environment. Arranging for a professional inspection as needed makes it easier to identify the cause while maintaining safety.

When inspecting connection points and cables for faults, we also check for factors that could cause recurrence. Even if you only perform repairs, if background factors such as moisture, vegetation, soil and debris, exposed cables, or animal intrusion remain, abnormalities may occur again. To reliably improve power output, it is important to check not only the electrical faults themselves but also the site conditions that make those faults likely to occur.

On-site Check 8: Verify the shutdown history and output curtailment of converter equipment

The cause of low power generation is not just the panels or the wiring. If the equipment that converts the generated electricity is stopped or its output is being limited, power generation will not increase even when solar irradiance is sufficient. During on-site inspections, it is essential to check the operating status of the conversion equipment, shutdown history, alarm history, and whether output curtailment is in effect.

When reviewing stoppage history, check which equipment stopped, when it stopped, and for how long. Even short stoppages can cause large losses if they occur during the daytime when generation is high. If stopping and resuming repeatedly during the day, the issue may not stand out in the monthly totals, yet you could actually be missing generated power. Whether only a specific piece of equipment has stopped or multiple pieces of equipment have stopped simultaneously will change what causes you should suspect.

If output curtailment is occurring, power generation may plateau even on clear days. If the top of the generation curve looks flat, check operational data and historical records. However, a flat curve does not necessarily mean output curtailment. Similar shapes can result from equipment capacity limits, temperature increases, insufficient input, panel soiling, shading, or measurement anomalies. Do not judge based on the generation curve alone; it is important to confirm by comparing historical data with on-site conditions.

If the time of the drop in power generation matches shutdown logs or alarm logs, checking the conversion equipment takes priority. If there are no abnormalities in the logs, check the input side: panels, strings, connections, shading, soiling, and weather conditions. Even if it appears to be a fault in the conversion equipment, the low output may actually be caused by insufficient generation on the input side. Do not assume a single cause; check the converter itself, the input side, and the surrounding environment separately.

Even when inspecting conversion equipment, safety must be the top priority. On-site personnel should avoid forcibly opening the interior or touching connection points to make an assessment. It is important to organize the equipment suspected of being abnormal, the time of occurrence, changes in power generation, history, exterior photos, and the surrounding environment, and to refer the case to a professional inspection as needed.

On-site Check 9: Verify Temperature Rise, Poor Ventilation, and the Environment Around Equipment

A factor often overlooked when power output is low is temperature rise and poor ventilation. Although solar power generation generally performs better with stronger solar radiation, output can become difficult to increase when panel temperatures or the temperatures around equipment rise. If, on a sunny summer day, generation does not increase as much as expected, the midday peak is muted, or the system becomes unstable during periods when equipment tends to run hot, you need to check the temperature environment.

If weeds are growing densely under the panels, airflow can be reduced and heat can build up. Even if the weeds are not directly casting shadows, they can affect power generation by causing poor ventilation or making inspections more difficult. Grass or debris around equipment can not only make visual checks harder but also affect heat dissipation and ventilation. To improve power output, it is necessary to check not only the panel surfaces but also the environment around the equipment.

Inspect the area around power conversion equipment for grass, fallen leaves, sediment, obstacles, puddles, mud, and the condition of access paths. When the surroundings of the equipment are difficult to see, it becomes harder to notice abnormal indications or changes in appearance. Poor access paths delay inspections and also delay the discovery of abnormalities. To increase power generation, it is important to maintain an environment in which equipment can operate stably and to keep the site in a condition that allows immediate confirmation when an abnormality occurs.

Reductions in power output due to temperature increases can be difficult to eliminate completely. However, it is possible to reduce unnecessary heat buildup. Managing weeds beneath the panels, ensuring ventilation around equipment, maintaining inspection walkways, checking for accumulated debris, and reviewing the flow of rainwater and sediment are measures that are easy to implement on site. When checking for reduced generation in summer in particular, consider not only solar irradiance but also the effects of temperature and ventilation.

Continuously recording power generation data and on-site environmental conditions is effective for judging the effects of temperature and ventilation. If you can identify trends—such as certain equipment becoming unstable on hot days, the power generation curve flattening during periods when grass becomes overgrown, or a reduction in shutdowns and alarms after improving ventilation—it will be easier to decide on countermeasures going forward.

On-site Check 10: Confirm Causes of Recurrence from Drainage, Topography, and Inspection Records

Lastly, what I want to check are drainage, topography, and inspection records. These may appear to have no direct relationship with power generation, but in reality they are important factors that can lead to soiling, weeds, connection faults, and reduced ease of inspection. Areas where water tends to pool, places where sediment can flow in, paths that easily become muddy, slope failures, scour around mounting structures, and locations where cables are likely to be exposed can all repeatedly cause reductions in power generation.

Where puddles remain after rain, weeds tend to grow. When weeds grow, they cast shadows, reduce airflow, and make inspections harder. In areas where sediment is washed in, dirt tends to accumulate at the lower edges of panels and around cables. If cleaning and weeding repeatedly fail to stop the same problems in the same locations, drainage and terrain issues need to be checked.

When checking terrain and drainage, on-site inspections after rain as well as during fine weather are effective. Determine where water flows in, where it pools, and where it drains out. By recording puddles, sediment accumulation, overgrowth of vegetation, subsidence of pathways, and changes to slopes, you can identify locations prone to recurrence. If poor drainage is left unaddressed, the same power generation losses will be repeated.

Inspection records are also indispensable for isolating causes. If you can confirm whether the same spot has shown soiling in the past, whether grass has been growing in the same row, or whether the same equipment has experienced stoppages, you can narrow down the cause more quickly. If records are lacking, start with this inspection by recording photos, date and time, equipment number, location, details of abnormalities, and the status of responses so they can be used for the next inspection.

By identifying the causes of recurrence, improvements in power generation shift from temporary measures to continuous management. We do more than just clean soiling; we examine why that location is prone to getting dirty. We do more than just cut grass; we check why grass tends to grow in that spot. We do more than just repair connections; we record background factors such as moisture, drainage, and cable exposure. With this perspective, the same power generation losses become less likely to recur.

Approach to Improving Power Generation After Root Cause Isolation

After isolating the causes during on-site inspections, the next important step is to determine the priority of countermeasures. If you try to resolve all issues at once, the workload increases and measures that would have a large impact on power generation may be delayed. First, prioritize checking equipment that shows a clear decline in generation data, shading with a long duration of impact, recurring soiling or drainage problems, and devices that experience frequent stoppages even if each is brief.

When choosing countermeasures, consider together the impact on power generation, the likelihood of the cause, the ease of implementing the measure, safety, and the likelihood of recurrence. If dirt or shading overlaps equipment with low power output, prioritize cleaning and weed removal. If only a particular string shows low output, check the connections, cables, and the input side. If the time of the power drop matches the stoppage history of the power conversion equipment, prioritize checking the equipment side. If the same location shows problems after rain, reassess drainage and terrain.

After implementing countermeasures, check how power generation changed. Once cleaning, weeding, repairs, equipment inspections, and drainage checks have been completed, record the power generation before and after the work, on-site photographs, the scope of work, and the weather conditions. It is difficult to completely eliminate the influence of weather, but by comparing sunny days with one another or comparing with installations under the same conditions, you can identify consistent trends. Prioritize measures that showed a large effect for future work, and if an effect is not apparent, consider other possible causes.

Improving power output is not something that can be completed with a single operation. Solar power plants are outdoor facilities, and their condition changes with the seasons, weather, surrounding environment, and the aging of equipment. Even if you clean them, dirt will return; even if you remove weeds, grass will grow; trees will grow; and equipment and wiring will also change condition. To steadily increase power output, a system is needed that repeatedly carries out inspections, countermeasures, verification of effects, and record updates.

When multiple people are managing, it is also important to be able to share the exact same location. In a large power plant, similar rows and equipment are often lined up, so a photo alone can make the location difficult to identify. If equipment numbers, location information, photos, and work histories are recorded together, on-site personnel, managers, inspection personnel, and repair personnel will find it easier to confirm the same location. Keeping the results of root-cause isolation in a shareable form provides the foundation for continuously improving power generation output.

Summary

When checking a site for low power output, it is important not to assume a single cause, but to check, in order, generation data, comparisons with equipment under the same conditions, weather and solar irradiance conditions, dirt on panel surfaces, shading from weeds or trees, differences between strings, connection points, power conversion equipment, the temperature environment, drainage, and inspection records. In solar power generation you cannot increase the solar irradiance itself at the site. However, you can improve output by bringing the system closer to a state that converts the received irradiance into electricity without waste.

When you feel the power generation is low, don’t immediately carry out cleaning or repairs; first segment and review the data. Determine when the output is low, which equipment is underperforming, and whether there is a difference compared with equipment under the same conditions. With that information, an on-site inspection will clarify where to clean, the areas to weed, the connection points to check, the equipment to verify, and the drainage or access routes to reconsider. Deciding the order of site checks makes it easier to isolate the cause.

Also, improving power generation is not something that can be completed with a single operation. Even if you clean, dirt will return; even if you remove weeds, they will grow back; trees will grow; and equipment and wiring will change condition with age. By comparing power generation before and after countermeasures, keeping on-site photos and work records, and using them for the next inspection, the accuracy of improvements will increase. To stably increase power generation, it is essential not only to remove the causes but also to create a site environment and management system that make the same causes less likely to occur.

In particularly large power plants, a system for accurately sharing problem locations is important. If you record, together with location information, the rows that tend to get dirty, spots where shadows occur, places where water accumulates, abnormal strings, locations suspected of faulty connections, points where conversion equipment has stopped, cleaning areas, repair locations, and inspection photos, it becomes easier for stakeholders to confirm the same place. By combining power generation data with on-site location information, it becomes easier to explain the priority of cleaning, weeding, repairs, and specialist inspections, and it also streamlines subsequent recurrence checks.

When you want to carry out on-site checks for low power generation based on field data—from isolating causes to managing countermeasures—utilizing LRTK is also effective. LRTK, as an iPhone-mounted GNSS high-precision positioning device, is useful for recording inspection points within a solar power plant, soiling-prone spots, shading locations, areas with poor drainage, abnormal equipment, connection points and areas around equipment, cleaning coverage, repair locations, and on-site photos along with high-precision location information. By keeping the results of the 10 on-site checks with location information, it becomes easier to proceed with power generation improvements based on field data rather than on intuition.