Practical renewable energy technology that reduces costs and helps the environment
13P, Captain Ganpat Ram Yadav Marg, Block D, Indira Colony 2, Sector 52, Gurugram, Haryana 122003
Date: 2026-10-30 | Category: solar plant underperforming
Solar power plants are built with the intention of providing electricity for years. However, the generated energy sometimes differs from the anticipated one because the solar plant could have less productivity at specific months of operation, decrease production performance progressively, or be always inefficient compared to the anticipated electricity generation rate. This may affect profit margins, savings, and ROI calculations for business purposes.
Still, low production does not always point to the inefficiency of the solar power plant. There are many interrelated elements affecting solar production such as availability of sun rays, temperature, equipment chosen and other elements. It is important to understand the difference between the normal response of the solar generator to the changing conditions and the issue of performance.
Awareness of the components and how to handle them will help you set proper expectations, detect inefficiencies in time, and make well-grounded decisions concerning the maintenance and improvement of your solar power station. For solar plants built by Rayax Energy, these aspects go beyond the installation of the equipment itself.
In cases where there is lower-than-anticipated production of energy in a solar plant, a methodical procedure that would allow one to pinpoint the source of this problem and avoid future losses could be implemented. This process will include comparing the energy production to anticipated levels, looking into any dust or shadows on panels, analysing the performance of inverters and electrical systems, examining any constraints posed by the grid, and creating an ongoing monitoring program.
Firstly, it is necessary to understand that solar panels do not have constant power generation every single day. The generation depends on the number of sunny days and the angle at which sunlight strikes the module.
Thus, solar plants calculated using annual generation estimates will work differently depending on the month of the year. With more hours of sunlight and favourable weather conditions, the generation will be higher, while with rain, snow, dust storms and shorter hours of sunlight in winter months, it'll be lower.
For example, a solar plant used in business will generate power effectively during sunny summer mornings, but the generation will be lower during monsoon days. That is normal and it should be taken into account when assessing the efficiency of the plant.
What matters is not the comparison of two single days, but the generation with respect to expectations during the same period taking into account weather conditions and seasonality.
Thus, a correctly estimated solar project starts with realistic generation estimates and not with the idea that there will be sunny days all the time.
It would be natural to assume that higher temperatures would make solar panels produce more electricity. In reality, solar modules tend to work most efficiently if they receive high sunlight levels with not too high cell temperatures.
Standard modules usually decrease their output as their temperature goes up from the nominal 25° Celsius. How much of it depends on the temperature coefficient of the modules, which is given by the manufacturer in the technical datasheets.
Under Indian conditions, roof-top and ground-based solar systems can reach very high module temperatures in summer, especially with insufficient ventilation of the modules. This means that while receiving a lot of sunlight, the installation may actually produce less electricity per one unit of sunlight.
Why does it matter? Module efficiency rating is not enough to fully assess the performance of the installation.
How to help?
Within the context of Rayax Energy, technology selection and design need to take into account the conditions within which operations are carried out.
Another very common reason for the underperformance of solar plants is the dust accumulated on the surface of the solar modules which becomes a major issue in the industrial parts of India, dry regions as well as polluted regions.
Just a slight amount of dust may decrease the amount of sunlight entering the modules. Besides, over time, bird dropping, industrial waste and other deposits become very difficult to remove with only the help of rains. The influence of this issue depends on the conditions of the particular site, cleaning frequency as well as the types of deposits accumulating.
Thus, in a large solar plant, even a minor decrease in productivity for each module may result in huge generation losses.
Cleaning and monitoring of the plant can prevent such a situation, but still, there should not be a set schedule of cleaning regardless of the site's conditions. There should be taken into account factors like water availability, the amount of dust, cleaning costs as well as the damage to the modules from cleaning.
How should the owner act? It is necessary to monitor the productivity of the plant before and after cleaning, check modules for any deposits and develop an appropriate maintenance regime taking into account local conditions. The cleaning process should be carried out according to the manufacturer's instructions using appropriate tools without damaging the glass surface.
Solar PVs require light exposure, and adjacent buildings, trees, poles, fencing and other constructions may create shadow coverage on the array. Ground-mounted solar power plants may suffer from insufficiently calculated distance between rows in which one row shades another because of low sunlight angle.
Shading is not always limited by the panel that is located under shadow because of the special design of modules and electrical configuration.
Therefore, a shading assessment must be conducted prior to the mounting of solar panels. It must not be made when generated amounts fail to meet expectations.
In the course of design engineers have to take into account the trajectory of sunlight, obstructing objects, terrain, module orientation and distance between rows.
When the power plant is working already, shading analysis will reveal the reason for the problem. In some cases cutting back the vegetative cover or removing of an avoidable obstruction may increase efficiency of electricity generation. In other cases more complicated actions are required.
The goal is not simply to use available areas for mounting solar panels. It is to arrange them properly for generating electricity effectively.
Even with top-notch modules, the solar plant will perform poorly without proper design.
It is essential to consider the plant's size, the inverters' capacity, the configuration of the strings and all the cable sizes. Failure to achieve the appropriate balance between these elements leads to avoidable loss of energy.
This can take the form of inverter clipping. In some cases, the modules generate more current than what the inverter can handle. In such cases, the inverter caps its output at its rated capacity and fails to generate any extra power.
An inverter clipping scenario where the DC-to-AC capacity ratio leads to clipping on occasion is one of the design considerations. Nevertheless, clipping can happen excessively or inappropriately.
Other possible issues related to design include wrong connection of strings, insufficient cable sizes, poor quality connections and poor ventilation around the equipment.
This can be prevented through proper calculations of the design, appropriate equipment choices and installation and commissioning tests. Rayax Energy designs its solar installations to fit its customers' energy needs through site assessment, generation modeling and design of systems.
Solar panels may still receive solar radiation even in the case where the plant cannot utilise that energy in the form of power. This occurs either due to the tripping of inverters, activation of protection mechanisms, communication problems or malfunctions in electrical connections.
Sometimes, the reason for such malfunctions is clear: an overheated inverter, poor connection. Other times, repeated shutdowns may reveal more serious problems of electrical or equipment nature.
The consequences depend on how long and frequent this fault occurs. A malfunction that stays unnoticed for several days may cause unnecessary losses in generation, especially in case of full utilisation of the plant at favourable conditions.
Proper monitoring and maintenance will help identify these faults prior to their occurrence. It is necessary to analyse alarms in the inverter, performance of different inverter blocks and abnormal periods of low production.
One should not assess the efficiency of the solar plant merely by the state of its equipment. The main criterion is its consistent ability to transform available solar radiation into electric energy.
All generation deficits do not arise within the solar power plant itself. Sometimes the power plant is capable of producing power but it cannot export all of it due to grid constraints.
This may be because of grid failures, network constraints, export restrictions or generation curtailment. Restrictions set for inverters and for grid connections approved in certain power plants are also factors that restrict the amount of power that can be exported.
In relation to Open Access and utility-scale solar power plants, the above factors may impact the amount of electricity exported to the grid despite the equipment in the solar power plant working fine.
It is therefore necessary to differentiate between generation of electricity, electricity consumed within the power plant and electricity exported to the grid. The three amounts mentioned above have connections but they are not interchangeable.
When generation of electricity is normal on inverter records and yet exported electricity is less, one should first check metering information, grid availability, restrictions on exporting electricity and any other contract before labelling the equipment as underperforming.
The solar modules are capital investments, however, the capacity to produce energy starts declining over time due to aging. This phenomenon is called degradation.
Factors like sunlight exposure, high temperatures, moisture, and other factors that influence the environment during the life span of the module may have an impact on its efficiency. These rates depend on the type of the technology, the quality of the manufacturing, operating conditions and the warranty of the product.
Thus, a decrease in the capacity per year is considered normal. At the same time, any dramatic drop in productivity cannot always be linked to the aging of modules.
The research conducted among existing PV plants proves that the rates of degradation differ from one installation to another. It confirms once again that the evaluation of particular plant performance is more important than the percentage of decline.
The owner of the project needs to consider the performance warranty of the manufacturer of the module, keep in mind the effects of weather when analysing the annual generation and be concerned about the faulty strings/modules.
Even after the completion of commissioning, the solar power plant does not become maintenance free because dust deposition, vegetation growth, technical issues, loose connections, and communication issues may occur.
If no-one takes time to analyse data generated, then such problems will remain hidden for weeks or even months.
Operation and maintenance should involve periodic module inspection, inverter inspection, electrical testing, cleaning if necessary, and analysis of power generation data. The use of monitoring software can assist the operator in detecting abnormal output patterns and troubleshooting to find out any faults before losses accumulate.
One of the ways to do this is to compare the power output of the plant with that of its expected output at the same operating conditions. Performance ratio and specific yield will add more information about the plant if there is appropriate measurement.
The main thing is not to depend solely on the amount of electricity produced by the plant in one particular month.
If a solar plant fails to produce the required amount of energy, changing the equipment right away is usually not the best thing to do. A performance audit can help find the reason behind this problem.
The following list will be useful to the owners and operators of solar plants when searching for a solution:
Planning of the solar generation starts well before the first unit of electricity generation. The planning includes site evaluation, engineering, equipment, installation procedures, as well as the maintenance of the plant over its operational period.
Planning of solar energy projects at Rayax Energy includes site evaluation, performance modeling, equipment choice, and engineering. The company operates with commercial and industrial solar, utility-scale projects, PM-KUSUM projects, and various types of renewable energy solutions. Project planning, installation, and maintenance services offered by Rayax Energy.
For business owners and project developers, the installation of the plant should be viewed more comprehensively than just the installed capacity. Planning of the project must include calculation of system losses, local environmental conditions, limitations of equipment, and requirements for operational procedures of the facility.
In cases where the generation is less than expected, the comprehensive evaluation of the facility can show whether the problem lies in the initial design of the facility, its operation, performance of the equipment, or the maintenance procedures.
The task of the planning process is not only installation of the plant but providing reliable performance.
At times, the output from solar power stations could be lower than anticipated since there would always be a variation between practical operating conditions and theoretical laboratory conditions. Various factors such as high temperatures, dust, shading, limitations in the design, equipment problems, grid constraints and degradation could affect the output.
Not all the losses in efficiency could be prevented and some would always have to be considered in estimation. Nevertheless, other issues could be controlled through proper engineering practices, right choice of equipment and monitoring and maintenance.
For solar power station operators, it would be very critical to know the distinction between variations and the actual performance problems. With accurate data collection and a proper investigation, the areas that can be improved upon would be determined.
A successful solar power station is not based on its capacity alone but rather how effectively the capacity has been converted into electric power. With proper planning and performance management, solar power stations would be reliable assets in the future.
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