In a solar rooftop system, the solar panels are installed in the roof of any residential, commercial, institutional and industrial buildings. This can be of two types (i) Solar Rooftop System with storage facility using battery, and (ii) Grid Connected Solar Rooftop System.
Such rooftop system has battery as storage facility. The solar electricity is stored in the battery and can be utilized during night also when the sun is not available.
In grid connected rooftop or small SPV system, the DC power generated from SPV panel is converted to AC power using power conditioning unit and is fed to the grid either of 33 kV/11 kV three phase lines or of 440/220 Volt three/single phase line depending on the capacity of the system installed at institution/commercial establishment or residential complex and the regulatory framework specified for respective States. These systems generate power during the day time which is utilized fully by powering captive loads and feed excess power to the grid as long as grid is available. In case, where solar power is not sufficient due to cloud cover etc., the captive loads are served by drawing power from the grid.
Such rooftop systems can be installed at the roofs of residential and commercial complex, housing societies, community centers, government organizations, private institutions etc.
The average cost of grid connected rooftop solar systems is about Rs. 40 per watt or Rs. 3.5 crore per MWp capacity.
MNRE offers Rs. 30k for 1 kW, Rs. 60k for 2 kW, Rs. 78k for 3 kW, and Rs. 78k for 3 kW onwards for any capacity to individual house. For Society common area Rs. 18k per kW till 500 kW capacity.
There are provisions of concessional import duty/excise duty exemption, accelerated depreciation and tax holiday for setting up of grid connected rooftop power plants.
Department of Financial services has instructed to all Public Sector Banks to encourage home loan/ home improvement loan seekers to install rooftop solar PV plants and include cost of system in their home loan proposals. So far, nine PSBs namely Bank of India, Syndicate Bank, State Bank of India, Dena Bank , Central Bank of India, Punjab National Bank, Allahabad Bank, Indian Bank and Indian Overseas Bank have given instructions to extend loan for Grid Interactive Rooftop Solar PV Plants as home loan/ home improvement loan.
The rooftop solar systems from 1 kWp upto 5000 kWp or in combination can be set up on the roofs.
About 10 sq. ft. area is required to set up 1 kWp grid connected rooftop solar system.
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Electricity generation at the consumption center and hence Savings in transmission and
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distribution losses
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Low gestation time
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No requirement of additional land
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Improvement of tail-end grid voltages and reduction in system congestion with higher
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Self-consumption of solar electricity
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Local employment generation
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The grid connected rooftop system can work on net metering basis wherein the beneficiary pays to the utility on net meter reading basis only. Alternatively two meters can also be installed to major the export and import of power separately. The mechanism based on gross metering at mutually agreed tariff can also be adopted.
In feed-in-tariff the Government offers a tariff for purchase of the solar power generated from such plants.
Net metering mechanism is more popular among States.
In case the grid fails, the solar power has to be fully utilized or stopped immediately feeding to the grid so as to safe-guard any grid person/technician from getting shock (electrocuted) while working on the grid for maintenance etc. This feature is termed as ‘Islanding Protection’.
(i) States should have conducive solar policy to allow the grid connectivity.
(ii) State Regulators have issued tariff order for appropriate tariff, net-metering/feed-in tariff and the grid connectivity, and
(iii)The Distribution Companies agree to allow grid connectivity and purchase the electricity on feed-in-tariff or through net metering arrangement.So far, 13 States/UTs namely Andhra Pradesh, Chhattisgarh, Delhi, Gujarat, Haryana, Karnataka, Kerala, Punjab, Rajasthan, Tamil Nadu, Uttarakhand, Uttar Pradesh and West Bengal have notified policies that include promotion of grid connected rooftop solar systems with net metering. Regulation from the State Electricity Regulatory Commission is also required to allow net metering/ feed-in-tariff.
The Projects under these guidelines fall within two broad categories i.e.(a) the projects connected to HT voltage at distribution network (i.e. below 33 kV) (b) the projects connected to LT voltage i.e. 400/415/440 volts (3-phase) as the case may be or 230 volts (1-phase). Accordingly, the projects may be under the following two categories.
Category 1: Projects connected at HT level (below33kV) of distribution network
The Projects with proposed installed capacity of minimum 50 kW and upto 500 kW and connected at below 33kV shall fall with in this category. The projects will have to follow appropriate technical connectivity standards in this regard.
Category 2: Projects connected at LT level (400 Volts-3 phase or 230 Volts-1 phase)
The Projects with proposed installed capacity of less than100kW and connected of the grid at LT level (400/ 415/ 440 volts for 3-phase or 230V for1-phase) shall fall within this category.
There can be many possible business models, some of which can be considered are as follows:
(a) Solar installations owned by consumer:-
i) Solar Rooftop facility owned, operated and maintained by the consumer(s).
ii) Solar Rooftop facility owned by consumer but operated and maintained by the 3rd party.
(b) Solar installations owned, operated and maintained by 3rd Party:-
If the 3rd party implements the solar facility and provides services to the consumers, combinations
could be:
i) Arrangement as a captive generating plant for the roof owners
The 3rd party implements the facility at the roof or within the premise of the consumers; the
consumer may or may not invest as equity in the facility as mutually agreed between them. The
power is then sold to the roof owner.
ii) Solar Lease Model, Sale to Grid
The 3rd party implementing the solar facility shall enter into a lease agreement with the
consumer for medium to long term basis on rent. The facility is entirely owned by the 3rd party
and consumer is not required to make any investment in facility. The power generated is fed
into the grid and the roof top owner gets a rent.(c) Solar Installations Owned by the Utility:-
i) Solar installations owned operated and maintained by the DISCOM
The DISCOM may own, operate and maintain the solar facility and also may opt to sub contract
the operation and maintenance activity. The DISCOM may recover the cost in the form of
suitable tariff. The electricity generation may also be utilized by DISCOM for fulfilling the solar
renewable purchase obligation.
ii) Distribution licensee provides appropriate viability gap funds
The DISCOM may appoint a 3rd party to implement the solar facilities on its behalf and provide
appropriate funds or viability gap funds for implementing such facility.The programme is being implemented through multiple agencies for rapid up-scaling in an
inclusive mode. These agencies are:(i) State Nodal Agencies(SNAs)
(ii) Solar Energy Corporation of India (SECI)
(iii) Channel Partners:
a) Renewable Energy Service Providing Companies (RESCOs)
b) System Integrators
c) Manufactures of any component of the Solar Plants
d) Project developers
e ) Vendors/ suppliers of solar equipment
f) Reputed and relevant NGOs of National level
(iv) Financial Institutions/Financial Integrators
The Financial Institutions like NABARD, National Housing Banks, Other Banks, IREDA, SECI
etc.
(v) Other Govt. Departments/Agencies
The other Govt. Departments/Agencies i.e., Railways, Defense/Para Military Forces, Local
Government Bodies including Municipal Corporations/Municipalities, PSUs, Institutions,
Development Authorities, DMRC, State Departments interested in directly implementing the
programme.India is endowed with vast solar energy potential. About 5,000 trillion kWh per year energy is incident over India’s land area with most parts receiving 3-5 kWh per sq. m per day. Based upon the availability of land and solar radiation, the potential of solar power in the country has been assessed to be 750 GWp.
Yes, we provide consulting services to assist with planning, design, and implementation of renewable energy projects.
Yes, we offer comprehensive maintenance services to ensure optimal performance and longevity of renewable energy installations.
Project timelines vary depending on factors such as project scale, location, and specific requirements. Our team works efficiently to ensure timely project delivery.
We provide ongoing customer support, maintenance services, and performance monitoring to ensure our clients' satisfaction and the optimal performance of renewable energy installations.
We offer flexible financing options to make our systems accessible, including leasing, loans, and partnership arrangements tailored to suit your budget and financial goals.
Currently, we provide services in select regions across Maharashtra, with plans for expansion into new areas.
Switching to renewable energy not only reduces carbon footprint but also offers long-term cost savings and promotes sustainability.
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Solar PV system is categorized into On-grid, Off-grid and Hybrid systems.
Hybrid system require battery backup which helps it to run the load in case of grid failure or power outage. Its works as a on-grid in case of Grid availability.
This is basically a solar PV system with battery backup where there is no Grid availability.
Microinverter are small inverters used in solar on-grid system which actually converts DC to AC at panel levels. This are AC coupled systems.
String inverters are used in solar on-grid system helps to convert DC to AC power. Number of panels are connected in a string and that to the inverter for DC to AC conversion.
Optimizer are used in solar PV system at panel level, usually between the two panels. The MPPT operation is efficiently handled at panel level instead of inside the inverter.
Microinverter gives better results in longer run.
There are company in the markets but we are using Enphase microinverters.
In string inverter min two to twenty panels are connected in string, converting single point DC to AC conversion with MPPT. In case of optimizer-based string inverters the optimizer are connected between the two panels opting MPPT functionality at panel level and converting DC to AC power at inverter level. Microinverter are installed with each panels generating AC power directly.
Not all system is converted from On-grid to Hybrid but there are few brands of inverter which can be coupled with battery and make it to hybrid.
PM Surya Ghar: Muft Bijli Yojana is a government scheme that aims to provide free electricity to households in India. The scheme was launched by Prime Minister Narendra Modi on February 15, 2024. Under the scheme, households will be provided with a subsidy to install solar panels on their roofs. The subsidy will cover up to 40% of the cost of the solar panels. The scheme is expected to benefit 1 crore households across India. It is estimated that the scheme will save the government Rs. 75,000 crore per year in electricity costs.