VEMC-Blogs

Tag: solar power installation

How to Evaluate Performance Ratio (PR) in Solar Power Plants

by vemcoblogs -
solar power plants

When it comes to optimising the efficiency of a solar power plant, understanding its Performance Ratio (PR) is crucial. PR is a key metric that helps gauge how effectively a solar installation is converting sunlight into usable energy. 

For businesses and organisations that have invested in solar power installations, knowing how to calculate and improve PR can significantly enhance returns on investment.

In this blog, we will explore how to evaluate the Performance Ratio (PR) in solar power plants and share best practices to optimise system efficiency.

What is Performance Ratio (PR)?

Performance Ratio (PR) is a measure of how efficiently a solar power system is performing in comparison to its theoretical maximum output. It is expressed as a percentage and helps assess how well the system converts sunlight into electricity under real-world conditions.

  • PR Formula:
    PR = (Actual Output / Theoretical Output) x 100

A higher PR indicates a more efficient system. Typically, a PR between 75% and 85% is considered good for a solar power plant.

Factors Affecting PR

Several factors influence the PR of a solar power installation:

  • Environmental Conditions: Weather conditions like temperature, humidity, and dust accumulation can affect solar panel performance. Extreme heat may reduce efficiency, while shading can also lower output.
  • System Design: Poor system design, such as improper panel orientation or suboptimal inverter capacity, can negatively impact PR. Ensuring the solar panels are correctly positioned to capture maximum sunlight is key.
  • Maintenance: Regular cleaning of the panels and timely maintenance of inverters and cables are essential to keep the system running at optimal efficiency.
  • Degradation of Solar Panels: Over time, solar panels lose their ability to convert sunlight efficiently. Monitoring this degradation is important for maintaining a good PR.

Measurement Techniques

To accurately measure PR, specialised tools and methods are used by professionals from solar installation companies. These include:

  • Data Logging Systems: Data loggers record various parameters like solar irradiance, panel temperature, and system output to provide a clear picture of the plant’s performance.
  • Inverter Data: Inverter performance data can also help calculate PR by comparing the energy produced with the theoretical output based on the amount of sunlight received.
  • SCADA Systems: Supervisory Control and Data Acquisition (SCADA) systems enable real-time monitoring of solar plants, helping in the accurate calculation of PR.

Analysing PR Data

Once the PR is calculated, it’s essential to interpret the data to identify any inefficiencies:

  • Identifying Performance Drops: If the PR is declining over time, it could signal problems like panel degradation, dirt accumulation, or system faults.
  • Seasonal Variations: Keep in mind that PR can fluctuate based on seasonal changes. Higher temperatures or heavy rainfall can affect solar power generation temporarily.

Improving PR Ratio

There are several ways to improve the PR of a solar power plant:

  • Regular Maintenance: Cleaning the panels and maintaining the inverters and cables ensures optimal performance.
  • System Optimisation: Work with a professional solar installation company to adjust panel angles, replace underperforming inverters, or add components like power optimisers.
  • Monitor and Act: Regularly monitor the performance of the solar system using tools like SCADA and act promptly when inefficiencies are detected.

The Takeaway

Evaluating the Performance Ratio (PR) is an essential aspect of managing and optimising a solar power plant. By understanding the factors that affect PR, using accurate measurement techniques, and taking steps to improve system performance, solar power installations can deliver better energy efficiency and cost savings. 

For businesses looking for reliable solar solutions, partnering with a trusted solar installation company like VEMC can ensure that their solar power installations achieve maximum efficiency and a high PR ratio.

For more information or to speak with our experts, feel free to connect with us on +91 98199 07445 or 022 43436655, or email us at marketing@vemc.co.in.

String Inverters VS Micro Inverters: 6 Key Comparisons

by vemcoblogs -
solar power installation

Solar energy is becoming an increasingly popular way to generate electricity for both homes and businesses. As of 2023, 17% of India’s installed power capacity comprised of solar energy. One of the key components of a solar energy system is the inverter, which converts Direct Current (DC) power from the solar panels into Alternating Current (AC) power that can be used in your home or office. There are two main types of inverters: string inverters and micro inverters.

VEMC is a leading solar power installation company, and in this blog, we discuss the key differences between string inverters and micro inverters. 

String Inverters vs. Micro Inverters: The Basics

Both string and micro inverters perform the same function – converting DC to AC. However, the main difference lies in where and when they do so.

With a string inverter, all the solar panels are wired together by a single string, which is connected to an inverter installed next to the premises’ utility meter. Micro inverters, on the other hand, are mounted directly on each solar panel, hence converting energy at its source.

6 Key Differences between String and Micro Inverters 

Even though their functions are the same, choosing between string and micro inverters can impact cost, efficiency and monitoring ability. Here are the six differences between the two:

  • System Efficiency

While offering high-efficiency rates, shading on even a single panel can negatively impact string inverters. This is because the entire string operates at the lowest-performing panel’s output.

On the other hand, micro inverters allow for independent optimisation. This means shading on one panel minimally affects the overall system’s output. Micro inverters generally have slightly lower efficiency per unit, but the overall system efficiency can be higher due to better energy capture.

  • Cost Implications

String inverters are typically less expensive upfront due to the lower number of units required. Micro inverters, with more individual components, can have higher maintenance costs over time. However, the modular design makes troubleshooting and repairs easier.

Micro inverters can have a lower long-term cost due to their higher efficiency and potential for reduced energy loss.

  • Installation Flexibility

String inverters are easier to install because they have fewer components. Micro inverter installations are more complex, as each panel has to be connected to its inverter. 

However, micro inverters offer more system design and maintenance flexibility and can be ideal for complex roof layouts.

  • Performance in Shading Conditions

Shaders can significantly impact string inverter performance, as the entire string’s operation depends on the output of the lowest-performing panel. 

This is much more optimised for micro inverters, which function independently. While shading doesn’t drastically affect their performance, micro inverters also get the most energy out of systems with unique specifications.

  • Monitoring and Maintenance

String inverters provide system-level monitoring, offering less granular data on individual panel performance.

Micro inverters offer panel-level monitoring, providing detailed information on each panel’s output and performance. This makes troubleshooting and maintenance easier.

  • Lifespan and Reliability

String inverters are considered more reliable due to fewer components and a simpler design.

While individual micro inverters may have a shorter lifespan, the modular design allows for easy replacement of faulty units without affecting the entire system. They are ideal when:

  • Some panels are shaded
  • Panels are mounted facing different directions
  • There’s a plan to add more panels. 

Choosing the Right Inverter 

When working on solar power installation, the right inverter makes all the difference. To choose between string inverters and micro inverters, consider the following things:

  1. Size of your solar panel system
  2. Sun exposure to the system and roof layout
  3. Energy goals of your business
  4. Cost considerations

Get in touch with VEMC at +91 98199 07445 or 022 43436655for a better understanding about solar power installation. For quotation send us an email on marketing@vemc.co.in
We are a leading solar power company, with over 75 years of experience in the sector.

Also read- Solar Success Stories: 3 Inspiring Businesses Benefiting from Solar Power

The Future of AI and Blockchain in Solar O&M

by vemcoblogs -

Solar energy is fast becoming one of the most favored sources of renewable energy across the world. But one of the most exciting aspects of solar PV systems is their ability to blend seamlessly with the latest technological developments across the board. AI and Blockchain are two new technologies that have a promising potential to drastically improve operations and maintenance in the solar energy space. VEMC is a leading solar energy company in Mumbai, and in this blog, we tell you all you need to know about the role of these technologies in solar energy.

Applications of AI in solar O&M

  • Predictive maintenance: 

An immense amount of thought, effort and finances go into maintaining solar power systems. But with the ability of processing past data through AI, you can zero in on equipment that need your immediate attention to prevent sudden breakdowns. This can  help reduce costs and avoid downtime.

  • Anomaly detection: 

With AI, anomalies can be detected with precision and in a timely manner. These include hotspots, potential induced defects (PID) or problems with diodes, strings or junction boxes.

  • Performance optimisation: 

AI can perform an enormous role in boosting the performance of your solar panels. Specialised algorithms can accurately perform data analysis to determine the optimal use of solar power. AI can also be used to monitor modules and micro-inverters for quick redressal of any anomalies. 

  • Automation: 

By analysing data from solar power systems, AI can help in automating the decision-making process and ensuring highest levels of efficiency and performance. 

Blockchain for secure data management and traceability

  • Asset tracking: 

As the solar energy industry is growing rapidly every passing year, its supply chain is becoming ever more complex creating challenges for traceability. With blockchain technology however, granular data can be collected at asset level and can be recorded on-chain.

  • Performance logging: 

With blockchain-based platforms, users can gain real-time insights for optimum performance of their on-grid solar system. The distributed ledger system helps monitor and log data exchange between panels, storage systems and the grid.

  • Warranty verification: 

With its decentralised and distributed ledger, blockchain technology can be used in keeping immutable records of warranty claims and records of equipment. These records cannot be tampered with and can thus offer an authentic and transparent warranty management mechanism.

Benefits of AI and Blockchain integration

  • Improved efficiency: 

One of the most outstanding benefits of both AI and blockchain technologies is more efficient operation of solar power systems.

  • Reduced costs: 

By streamlining the operations, AI and blockchain help in reducing human effort, cost of energy and material.

  • Enhanced transparency: 

These technologies offer highest levels of transparency in terms of authentic data records and documentation. Blockchain especially is a highly innovative way to capture and communicate important information across the solar power system.

For more on how technologies like AI and Blockchain can transform your conventional solar power system, feel free to call us on 022 43436655 or email us at marketing@vemc.co.in. We are the industry leaders when it comes to solar power installation.

Here are a Few Ways to Make Your Solar Installation Absolutely Safe & Secure

by vemcoblogs -
Safe And Secure Solar Installation

Solar energy is the future and a lot of homes are opting for it hoping to cut back on their electricity bills and receiving an uninterrupted power supply. But solar power installation must be done with a number of safety prerequisites in mind. The best solar company will take into account all factors like your building infrastructure like space or roofing and electrical connections before installation.

From the Electrical Point of View:

Before getting in touch with a solar energy company, track and keep a record of your monthly bills and the power drawn by your electrical appliances. You can do this using the energy calculator apps online. Usually, the monthly consumption in a typical urban household is 1-5 kW. Depending on your electricity needs, choose a solar power system of the right size. Standard solar panels have a 250 Wp (Watt peak) configuration, while larger panels can go up to 300 Wp depending upon the requirement.

Make sure the installer is connecting all the electrical wiring carefully and without leaving any glitches behind. A qualified engineer must supervise the process of routing the cables and it must be ensured that the cable is not damaged. Never touch the electrical wiring or contacts without proper protection gear or insulation.

The PV cells generate electricity by converting the sun’s energy, and the inverter converts the Direct Current (DC) from the panel into Alternating Current (AC). In case the components are “live” with electricity generated from the sun, they can cause an arc-flash electricity shock leading to severe injury or death. Make sure the system is properly earthed to prevent any such situations.

Make sure your solar power company is doing enough to protect your cables, say by using a flexible metal conduit when wiring through walls or if they are exposed to sun and rain outdoors.

Identify the Roof Structure, Type, and Material of the Roof:

Before you go for solar power installation, ensure that your roof offers ample space, has the right structure, and is made of robust material. Otherwise, mounting a heavy solar panel system can cause serious damage to your roof and accidental injuries to your family. Roof space is one of the primary factors to consider in metros, and is given the highest importance for instance by solar EPC companies in Mumbai.

The best roof for installing solar panels is a composite asphalt shingle roof. But by and large, solar panels are viable on most roof types except for wood shake roofs. The roof must ideally face south but in a country like India, as long as you have space for the panels, you’re good to go. Most places receive ample sunlight during the day irrespective of the direction of the roof.

When it comes to the ideal roof design for solar panels, the only rule is ‘simpler the better’. Roofs with lots of tiers, pipes, chimneys, and skylights can complicate the installation effort manifold.

If your roof is old or dilapidated, make sure you replace it before the installation. The old roof may not just be dangerous, it will cost double to dismount and then remount the panels when you eventually plan to replace it.

VEMC is a leading solar installation company. For solar panel installation in Mumbai, or for any information on solar power installation, feel free to get in touch at 022 43436655 or email us at marketing@vemc.co.in.

4 Tips on Increasing Solar Panel Efficiency

by vemcoblogs -

As the demand for sustainable energy grows, solar power stands out as the most favoured choice for the future. However, as solar systems require significant investment due to the high cost of semiconductors and allied components, it is important that maximum possible energy is generated from each square foot of a photovoltaic panel. Solar Operations and Maintenance (O&M) companies play a huge role in ensuring the highest efficiency of the solar power systems but some simple tips based on a common understanding of solar energy can go a long way in enhancing your output.

Well, the science behind solar energy is very simple — the higher the exposure of solar cells to sunlight, the greater will the output be. It is around this fundamental principle that most of these efficiency-enhancing tips revolve:

  1. Avoid shade: Due to the installation of intricate groupings of solar cells in a panel, even if a small part of the panel is covered by shade, the whole module will have less energy conversion. Shade is therefore a major inhibitor of solar energy and must be minimised as much as possible. This requires careful placement of the solar panels, away from a permanent high-rising object like a chimney or a vent. Tall trees around the facility must be well-trimmed to ensure their shadow doesn’t fall on the panels at any time of the day.
  2. Careful orientation: Solar panels must be oriented in the direction where they receive maximum sunlight throughout the day. This completely depends on the geographical location of the installation. India being a country in the northern hemisphere, the solar panels are always made to face the south to receive maximum sunlight. In the US, both south and west are the favoured directions and have been known to produce the maximum output.
  3. Proper upkeep: Solar panels can get covered in dust, dirt and bird droppings in a very short span of time. As they are mostly installed on rooftops, it might get a little difficult to clean the panels regularly. This could reduce the efficiency of the panels as some or whole of their surface area is screened from the sunlight. Providing convenient access to the panels and cleaning them regularly is therefore important.
  4. Weather: Hotter days ironically generate lesser energy due to increase in current and drop in voltage. While controlling the weather is beyond our ability, we can surely be mindful about buying panels with the lowest temperature coefficient, which refers to the amount by which the output of a panel reduces after temperature rises beyond 25⁰C.

For assistance to decide on the solar panel that suits your needs the best, feel free to contact us on +91 9819907445. We would be happy to assist you in finding the best match based on your requirements. As one of India’s best solar companies, with 73 years of market experience, VEMC provides end-to-end solar services to its clients. VEMC is ISO 9001:2015 certified and is one of the leading solar EPC companies in India.