Church of South India Synod, Chennai

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Church of South India Synod, Chennai

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[mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]About Church of South India[/mk_fancy_title]

The Church of South India (CSI) is the second largest Christian church in India based on the number of members and is result of union of Anglican and number of Protestant churches in South India.

The Church of South India is the successor of a number of Anglican and Protestant denominations in India, including the Church of England, the British Methodist Church and the Church of Scotland after Indian Independence.

The CSI synod consists of bishops of 24 dioceses, presbyters and layman (both men and women) who are elected from the respective diocesan councils to the synod. The synod members will elect the apex body consisting of a Moderator, Deputy Moderator, general secretary and Treasurer. The Moderator is the spiritual and administrative head of the Church.

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With a lot of visitors coming to be part of the church proceedings the guest house in CSI Synod is mostly full. With increasing visitors, building consumption is constantly increasing resulting in high electricity bills.

CSI Synod had decided on solar rooftop system while wondering about solving the high electricity bills.  They had approached Sunlit Future to install rooftop solar grid-tied systems on the guest house. It also inspires the visitors to consider sustainable solutions.

[mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]About the project[/mk_fancy_title]

A total of 100.56kW solar rooftop system was installed on the rooftop of the CSI-Synod.

CSI Synod had decided to go for the SolarEdge power optimizers and inverters rather than traditional string inverters to have a higher solar yield and greater savings.

These products aim to increase energy output through module-level Maximum Power Point Tracking (MPPT) and also provide module-level remote monitoring via the SolarEdge monitoring web portal and mobile app.

Complete system was connected with help of a Modbus meter which enables zero export option. As the building have equally high day time loads, they have considered to use Modbus meter till they get a bidirectional meter from the utility grid company.

It also captures the load of the complete building which helps in finding out the consumption patterns of the building.

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Project Details

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Location Whites Road, Chennai
Owner Church of South India, Synod
Capacity 100.64kW
Number of panels (370 Watts) 272
Type of panels Mono-crystalline
Orientation ~South at angle 10°
Structure Ganges
Inverter 27.6kVA SolarEdge (3 units)
Average units per day 422.7 kWh
Average units per year 1,54,281 kWh
Date of commissioning 24th May, 2019
[/mk_table][mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]Generation & Savings[/mk_fancy_title]

100kWp of Solar rooftop system on CSI Synod building is saving them about Rs.90,500/month by generating about 12,000 kWh/month on an average.

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Installation specifications

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370Watt Mono crystalline modules were used on this system manufactured by Waaree Energies.

Complete project was installed on the flat roof with the help of Ganges structure at an angle of 10 degrees facing towards the south direction. Considering the height of the building, inorder to avoid high winds, structure was designed to be close to the floor.

Safe walkways were provided ensuring seamless maintenance of the system. Cables were routed through UPVC pipes providing safety from external factors like weather, insects etc.

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Kalasalingam Academy of Research and Education

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Kalasalingam Academy of Research and Education

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[mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]About Kalasalingam University[/mk_fancy_title]

Located at the pristine foothills of the scenic Western Ghats, Kalasalingam Academy of Research and Education (KARE) was established in 1984. The University caters to students from all walks of life through its undergraduate, postgraduate and doctoral programmes.

They have elaborate infrastructure spread over 320 acres. It is the first university in India to introduce a special B. Tech programme in engineering for the differently-abled (speech and hearing impaired) students.

Kalasalingam Academy achieved 4th rank in Green Metric Rankings in 2018 with their various green initiatives.

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The University Board of this progressive and conscientious university had been troubled by their high electricity bills . Thus, it unanimously decided to opt for solar energy to power their campus.

It also helps them in promoting green initiatives across the campus in various departments and inspire future generations graduating from the campus. They had approached Sunlit Future to install rooftop solar grid-tied systems on the campus in phases.

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So far there was 503kW solar was installed on the various buildings of the institute in three phases.

In the 1st phase of going solar, a 96.48kW rooftop solar grid-tied system was commissioned on 18 May 2017. The University decided to go for the SolarEdge power optimizers and inverters rather than traditional string inverters to have a higher solar yield and greater savings.

These products aim to increase energy output through module-level Maximum Power Point Tracking (MPPT) and also provide module-level remote monitoring via the SolarEdge monitoring web portal and mobile app as shown in the gallery below.

Highly satisfied with the quality of the installation, the solar generation and the service, Kalasalingam University approached Sunlit Future for the II nd phase of its drive for rooftop solar and commissioned another 144kW in IInd phase.

Catering to the needs of their energy and reducing the electricity bills, another 263.2 kW solar PV system was installed and commissioned later in October, 2018.

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Project Details

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Location Krishnankoil, Tamil Nadu
Owner Kalasalingam University
Capacity 503.68kW
Number of panels (330 Watts) 360
Number of panels (335 Watts) 288
Number of panels (350 Watts) 824
Type of panels Mono-crystalline
Orientation ~South at angle 10°
Structure Pre fabricated
Inverter 27.6kVA SolarEdge (7 units)

55.4kVA SolarEdge (4 units)

Average units per day 2,065 kWh
Average units per year 7,53,757 kWh
Date of commissioning (Phase I – 96.48kW) 18th May, 2017
Date of commissioning (Phase II – 144kW) 28th May, 2017
Date of commissioning (Phase III – 263.2kW) 04th October, 2018
[/mk_table][mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]Generation & Savings[/mk_fancy_title]

With 503.68 kWp solar rooftop system on various buildings in Kalasalaingam university, it contributes to savings of about Rs.4,10,000/month. This system generated about 63,162 kWh/month on an average every month.

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Installation specifications

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All the three phases of the project were installed on the flat roof with the help of pre fabricated cement ballast structure made of Aluminium. This structure helps in corrossion free and long durability of the system.

Safe walkways were provided ensuring seamless maintenance of the system. Cables were routed through UPVC pipes providing safety from external factors like weather, insects etc.

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Aravind Eye Care Hospital, Puducherry

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[mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]About Aravind Eye Care[/mk_fancy_title]

Aravind Eye Care Hospitals chain emerged from Dr Govindappa Venkataswamy’s mission to eliminate the needless blindness of the people. Founded in Madurai, Tamil Nadu with 11 bed hospital, Aravind eye care emerged with more than 4000 beds. Aravind Eye Care treated more than 56 million people from its inception.

From Madurai, Aravind eye hospital expanded to TirupurSalemDindigulThoothukudiUdumalaipettai , Tirupati and neighboring Pondicherry.

Adding to the mission, Aravind Eye Care hospital in Puducherry had gone for a 201 kWp solar PV system on its rooftop to cater to the continuous energy consumption of the hospital in a sustainable way.

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With continuous inpatients and huge number of surgeries taking place round the clock, the hospital is contributing to huge electricity consumption. Due to which, they are incurring huge electricity bills and dependent on fossil fuels for that.

Inorder to decrease the electricity bills and contribute towards sustainable way of power generation, Aravind Eye Care hospital in Puducherry had gone for a 201 kWp solar PV system on its rooftop. 

The project was carried out in two phases with 136 kWp in Phase I and 64.6 kWp in Phase II, making it a 201.28 kWp capacity in total.

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System Specifications

201.28kWp solar was installed on the roof of the Aravind Eye Hospital in Puducherry in two phases.

In the 1st phase of going solar, 136kW rooftop solar grid-tied system was commissioned on 24th January 2018. The University decided to go for the SolarEdge power optimizers and inverters rather than traditional string inverters to have a higher solar yield and greater savings.

About Technology

SolarEdge products aim to increase energy output through module-level Maximum Power Point Tracking (MPPT) and also provide module-level remote monitoring via the SolarEdge monitoring web portal and mobile app as shown in the gallery below.

Highly satisfied with the quality of the installation, the solar generation and the service, Aravind Eye Care had further considered II nd phase of its drive for rooftop solar and commissioned another 64.6kW in IInd phase.

Catering to the needs of their energy and reducing the electricity bills, another 263.2 kW solar PV system was installed and commissioned later in October, 2018.

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Project Details

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Location Puducherry
Owner Aravind Eye Care
Capacity 201.28kW
Number of panels (335 Watts) 408
Number of panels (340 Watts) 190
Type of panels Mono-crystalline
Orientation ~South at angle 10°
Structure Ganges
Inverter 27.6kVA SolarEdge (6units)
Average units per day 845.4 kWh
Average units per year 3,08,562.24 kWh
Date of commissioning (Phase I – 136kW) 24th January, 2018
Date of commissioning (Phase II – 64.6kW) 26th March, 2018
[/mk_table][mk_fancy_title color=”#464646″ size=”20″ font_weight=”500″ margin_bottom=”0″ font_family=”none”]Generation & Savings[/mk_fancy_title]

With 201.28 kWp solar rooftop system on various buildings in Kalasalaingam university, it contributes to savings of about Rs.1,64,650/month on an annual average. This system generated about 25,363 kWh/month on an average every month.

 

 

Generation of Phase I & II in kWh


Savings in INR/month

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Installation specifications

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Both the phases of the project were installed on the flat roof with the help of Ganges structure. It is long lasting and durable enough to hold the modules for more than 25 years.

Safe walkways were provided ensuring seamless maintenance of the system. Cables were routed through UPVC pipes providing safety from external factors like weather, insects etc.

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Modbus Meter – For Zero Export from SolarEdge

Modbus Meter

SolarEdge Modbus Meter primarily helps in limiting the export of power to the grid generated using solar power plant enabling it for zero export. It also helps in finding the generation of the solar power plant, export to the utility grid, import from the utility grid and full time consumption inside the house 

It particularly is useful for large scale installations like schools, hospitals, industries and commercial buildings where the major loads are during the day time.

Procedure to avail a net meter takes anywhere between 4 weeks to 30 weeks. Having modbus meter helps in consuming the power generated from solar rooftop system from the minute of commissioning it. This takes care of all the day time loads till the bidirectional meter is availed.

This data is available in the remote monitoring app of SolarEdge giving us an understanding of generation from the system and consumption of the building as shown in the figure below. 

modbus-meter-04-05
modbus

Red colored graph in the above figure shows the loads of the building during the 24 hours. Blue graph indicates the generation and consumption in the building based on the total connected loads in the building.

It is in align with the total consumption. Total electrical load connected in the building is greater than the installed capacity of solar, that is why the generation most of the time is less than the consumption.

Advantages of having Modbus Meter

In case of the system not having a bidirectional meter

  • Limits the export of solar power by generating what is required for building’s self consumption
  • Continues to generate power based on the maximum and minimum energy needs of the building
  • Can study the connected loads in the building all the times
  • Can be used from the day of commissioning of the system till the bidirectional meter is installed
  • This feature is highly useful for the buildings with high day time loads – Institutes, Hospitals, Commerical and Industrial buildings
  • Remotely available monitoring data

In case of the system having a bidirectional meter,

  • Electrical loads can be seen on a real time basis through out the day and night
  • Peak time non-essential loads could be shifted to non-peak hours
  • Remotely available monitoring data within the SolarEdge app
  • Avoids loss of power generation
  • It also can be used during the export limitations
  • This meter holds the data of import, export and the connected loads which can also be seen in the monitoring portal

Modbus connection

modbus-connections

Working of the SolarEdge Modbus Meter

Export and Import data is read by a current transformer which is connected parallelly with the Electricity Board power supply to the SolarEdge Modbus meter through the communication cable, Modbus meter is connected to a SolarEdge Inverter. 

Power optimizers are connected to Inverter through Power Line Communication (PLC) ensuring the monitoring data to be available in Modbus meter and the monitoring portal.

This could be used in single and three-phase systems as well. 

Current Transformer

When ordering a Modbus meter it is also necessary to consider ordering the Current Transformer.

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Current Transformer ER Model Rated RMS Current (A) Internal (A X B)

External (C X D)

SE-ACT-0750-250 250 20 x 20 mm/61 x 60.4 mm
SE-CTS-2000-1000 1000 50.8 x 50.8 mm/121 x 127 mm
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ctdimensions

More details on Installation of the Modbus meter:  SolarEdge

SolarEdge Modbus Meter

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Silicon Hetrojunction (HJT) Modules from Waaree

Bifacial modules are gaining the traction due to its ability to generate more kWh in limited conditions, Waaree group had come up with their new Super Silicon HJT modules. These HJT modules generate higher kWh and long-lasting.

PV module market around the world has been cost-driven. It is no wonder that the crystalline technology has been the chalk horse of the industry. Further, with the Levelized cost of electricity (LCOE) from solar plants have started breaching grid parity. The focus now is to extract maximum kWh from the plant in order to ensure the investors have maximized returns. The technology up-gradation in conjunction with module design up-gradation has played a significant role in such a shift.

Utilization of bifacial module which is capable of generating power from both sides has been gaining traction. Given the fact that enhanced energy output could be expected under the right designing considerations. However, the currently available bifacial module utilizes PERC/PERT crystalline solar cells have limited bifaciality. They are coupled with other inherent issues like LID, PID, LeTID, etc. It was hence necessary to bank upon a pragmatic solution.

Silicon Hetrojunction (HJT)

Silicon heterojunction (HJT) solar cell which has been introduced in the mid-19th century, utilizes both crystalline and thin-film technology. The cell has crystalline silicon (n-type) sandwiched between amorphous (thin film) layers of silicon on both sides. It gives the cell its bifacial nature. The monocrystalline technology in the cell has better absorption of light. Whereas, the amorphous has superior passivation (which enables high electron collection) characteristics.

The cells are thinner (~120 μm) compared to crystalline silicon cell making it slightly flexible and further also making them highly resistant to micro-cracks. The n-type silicon present in HJT does not have Boron, which makes these cells LID free. Further, the mitigation of electron from the cell which is responsible for PID is reduced to zero in HJT cells. Thanks to the presence of highly conductive oxide layer (ITO) which protects the cell electrically.

Additionally, the cell has a lower temperature coefficient (almost half of the crystalline technology-based cells). All the above factors when coupled together enables HJT based module to have lower degradation rates throughout its lifetime.

Since these cells have high bifaciality, micro-crack resistance, no LID, PID & LeTID and lower temperature coefficient it is a perfect technology for Indian conditions. Waaree Energies recently in REI-2019 launched their SUPER HJT module which utilizes HJT solar cells. Available next year, this module has already started gaining popularity among the local and international markets.

Further, with the detailed scrutiny happening for each and every module we manufacture, the end customer can rest assured that their plant would be up and running for 25+ years. It ensures more than the desired return.

India has set an ambitious target of meeting 175GW of its power demand by renewable energy in 2022. While there has been a lot of improvement from its state of cumulative capacity in the early 21st century. From that state, the sector has seen a lot of government intervention and private partnerships in order to establish and develop a solar power plant in the country.

A new plan by the government (yet in draft version) enables Public Sector Undertaking (PSU) companies to utilize and/or source green energy. The plant shall likely be 1.8 GW of capacity (similar to coal-based ultra-mega power projects (UMPPs)) and may be divided into 3 parts. The country already has a plan to develop 12GW of the power plant through the PSU route. While there have been cases of tender cancellation in various states citing various reasons, we believe that the role of government in fuelling the solar PV market growth is crucial.

The role of PSU's in enabling India to meet its renewable energy targets

Cumulative & Expected capacity addition of solar energy in India by 2022

Health benefits from Renewable Energy sources implementation estimated

Implementing renewable energy sources for meeting the enhancement in demand of the world is a no brainer now. However, it is also a well-known fact that renewable energy comes with environmental advantages too! A recent study titled “Health co-benefits of sub-national renewable energy policy in the US” reviews the health benefits of implementing renewable source in Rust Belt, US.

The study compares the impacts of Renewable Portfolio Standards (RPS) on air quality and human health. The study compares Business As Usual (BAU) RPS case along with enhanced RPS cases of +50% & +100% and finally the case of pricing CO2 emissions to no renewable energy implementation by 2030.

The study finds that the co-benefits of the BAU, RPS + 50%, and RPS + 100% scenarios correspond to co-benefits of 8¢, 12¢, and 13¢ per kWh of new renewable generation (or $94, $120, $119 per ton of CO2 reduced respectively). It further suggests that CO2 emission pricing shall further have a positive impact with a health benefit realized up to $211 per ton of CO2 reduced. The study concludes by finding that health co-benefits in the region were 35%–79% higher depending on the RPS scenario. We believe that for a country like India which has ambitious missions like 24×7 Power for all and Health for all, studies like such should be taken into consideration by the policymakers to enable implementation of right sources.

Cost benefits from implementing renewable energy sources under different scenarios in 2030 comparing to no renewables implementation (Source: Emil G Dimanchev et al 2019 Environ. Res. Lett. 14 085012)

The state of solar grid parity in China and takeaways for India

Solar PV has gained tremendous popularity around the world and China is amongst the top leader in the market. Even though the country had both supporting government policies and attractive upfront subsidies for PV which is making it a competent source of electricity in the past few years. The country (and many countries around the world) breaching the grid parity, the dynamics are poised to be changed.

A new study titled “City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China” and published in “Nature Energy” reviews the situation of China. The study analysed more than 344 prefecture-level Chinese cities and finds that all these cities without any subsidy in solar PV, can meet grid parity.

Further with the country also being a coal-powered giant and utilizing desulfurized coal (which emits lower emission) for power production; the study finds that around 22% of the cities can produce electricity which can match prices of such sources.

The subsidy cuts in recent years was a clear note that the PV industry now needs to be focused on quality products rather than on the scale. But, economies of scale has been instrumental in the case of India. Very often it is forgotten that the solar PV plant is to last for 25 years which makes quality a crucial factor of review. We believe that the utility/customers which are only utilizing quality products would be able to reap the long term benefits of solar PV.

(From left) Historical LCOE of solar PV generation in China and (right) LCOE of various generating sources (Source: Yan J., et al. City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China. https://doi.org/10.1038/s41560-019-0441-z)

Source: Waaree Group

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