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Ensuring Smooth O&M: As Easy As 1-2-3!

Operation & Maintenance (O&M) is one of the most critical ways to ensure that the solar power system gives the best possible generation. At CleanMax Solar, we work to maintain the plant infrastructure and equipment, with the goal of improving the equipment's life by preventing excess depreciation and impairment. This enables the plant to produce maximum amount of energy throughout its operational life, perfectly aligning the interests of developers, clients and the investors.

Combining our experience in plant maintenance and advanced diagnostics with our expert O&M staff using remote monitoring system, CleanMax Solar ensures the plant functions smoothly, thereby continuously generating solar power.


Keeping the solar plant in good health

As a solar plant is installed, engineers at CleanMax Solar prepare a schedule for preventive maintenance. This includes, but is not limited to, adjustments, cleaning, lubrication, repairs, replacements, and the extension of equipment life. At least twice a year, O&M personnel conduct a general inspection of the solar power installation site.

During this inspection, technicians from CleanMax Solar:
  • Ensure roof drainage is adequate, roof drains are not clogged, and confirm that there are no signs of water pooling in the vicinity of the array
  • Ensure roof penetrations (if any) are watertight
  • Check for ground erosion near the footings of a ground mount system
  • Confirm electrical enclosures are only accessible to authorised personnel
  • Check for corrosion on the outside of enclosures and the racking system
  • Check for cleanliness throughout the site to ensure that there is no debris in the inverter pad area or elsewhere
  • Check for loose hanging wires in the array
  • Check for signs of animal infestation under the array

Apart from the basic checks, there are some specific checks that happen as part of the preventive maintenance at CleanMax Solar.


  1. Modules: Modules need maximum amount of preventive maintenance, and cleaning activities are majorly concentrated around them.
  2. Frequency of cleaning:

    In normal conditions, where there isn’t too much dust or dirt, cleaning is carried out on fortnightly basis. However, in dusty areas such as Rajasthan, the cleaning frequency is increased to once a week.

    Water Quality:

    The cleaning of the modules is done keeping in mind the TDS (total dissolved solids) levels, water specifications and certain wiping details. In India, the TDS level of the water needs to be at least below 250 parts per million (ppm). The chlorine (less than 250) and calcium (less than 250) level of the water as well as the electrical conductivity is kept in mind while carrying out the cleaning. Water quality is tested after every six months to ensure that set standards are maintained.

    Quality of cleaning equipment:

    Brushes without hard bristles (say fibre brushes) should be used for cleaning. A low quality brush, like one with metal bristles, could negatively impact the glass surface of the modules. In some cases where hard substances like bird droppings etc have gotten stuck on the module, engineers use detergent to clean the surface. However, the detergent is not highly concentrated and has very high water content.

    Innovation in Cleaning:

    Technicians at CleanMax Solar are currently in the process of developing automated cleaning systems. In the sprinkle-type cleaning system, nozzles will be placed on the module itself, and it will automatically start the system using remote monitoring, pressurise the water, and pour it over modules. It would be particularly useful for sites, where it is hard to install a water source at the site. However, this would be a costlier way to clean when compared to deploying someone at the site.

    Post wash care:

    Post extensive cleaning, modules are wiped off properly in order to ensure no stain is left to avoid affecting the generation capacity. Since CleanMax Solar takes up the responsibility of maintaining the plant, our engineers make arrangements for Ultra Poly Vinyl Chloride (U-PVC) conduit pipes to ensure water supply.

    After the system returns to steady-state temperature (i.e. there is no remaining impact from the cooling effect of wash water), the current produced is noted along with weather conditions including temperature, irradiance etc. This maintenance work is recorded in the log book, and the production of the clean system to the previous production values is compared.

  3. Inverter:

    Most German-make inverter manufacturers recommend servicing it on quarterly basis. However, CleanMax carries out servicing on a monthly basis as there is lot more dust in India compared to other countries. The ventilation is provided via filter, and this filter needs to be cleaned frequently. Therefore, usage of high quality filters is advantageous. As part of preventive activities, our engineers check the voltage of the string inverter and record it in the periodic log book. This gives an understanding of voltage fluctuations, if any.

  4. MC4 Cabling Connector:

    Under preventive measures, we ensure that there is no gap between the male and female connector pipes. Any gap, irrespective of the size, could cause a fire and damage the modules. Separately, offtakers can install a “check” meter of equal or higher accuracy wrt main meter to cross check the production level on a monthly basis. All readings have to be, more or less equal, with a 2-3% correction allowance.

  5. Transformer:

    For transformers at site with installed capacity in megawatts, parameters such as the operating temperature, OTI (oil temperature), WTI (winding temperature), and oil level are monitored daily. If there is any internal disturbance in the transformer, it reflects in these parameters which are monitored at least three-times in a day (at 11am, 02pm, and 04pm as solar power is generated at its peak during these slots).

    The transformer has to be cleaned thoroughly once in six months. CleanMax conducts IR test and cable yearly to check the transformer performance.

Protection from external elements:

In order to ensure that the plant is working smoothly (i.e. without any shutdown), the same has to be sealed properly. Else, rats and other rodents can come inside, and get electrocuted. This, in turn, can cause a short circuit, and affect the entire plant.

Many people are not aware that even high-pressured water can damage the modules. If the water stream is too strong, out team will place the outlet at a farther distance.

Remote monitoring:

A solar power plant consistently needs to be monitored to detect breakdowns and optimise its operation. The same function could be performed either on site or remotely wherein we retrieve all the data either from the inverter or from communicating equipment (probes, meters etc).

Monitoring the solar PV panels consistently is the cornerstone of the O&M of a solar power plant and CleanMax Solar does it successfully. It includes inspection, supervision, sending signals and messages, and receiving signals from the environment about irradiation.

We, at CleanMax Solar, understand that our clients expect the solar plants to achieve high levels of power generation. Hence, we have developed capabilities including state-of-the-art plant supervision technology, end-to-end solar power plant maintenance execution (from modules to substations) and superior performance engineering expertise.