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Unlocking the Power of 3kW Solar Rooftop System


Have you ever wondered how much energy can be harnessed from the sun’s rays? The facts show nearly 173,000 terawatts of energy reach the Earth’s surface, which is more than 10,000 times the world’s total energy use. However, with current solar technology, we use about 15-20% energy efficiently.

A 3kW solar system is a rooftop solar setup that can generate up to 3 kilowatts of electricity from the sun. It comprises 7-10 solar panels that can power essential appliances like lights, multiple fans, a fridge, LEDs, an air conditioner, and a washing machine.

Here is everything you should know about the 3kW rooftop solar system, from different types of 3kW solar systems and their daily production to a deep dive into the factors influencing its daily production.

Key Components and Specifications

A 3kW rooftop solar system comprises 7-10 solar panels, a mounting structure, an inverter, and wiring. The solar panels absorb sunlight and convert it into Direct Current (DC) electricity, which the inverter transforms into Alternating Current (AC). This AC will ensure the smooth functioning of your home appliances and feed the surplus energy back into the grid.

Types of 3kW Solar Systems for Home

There are 3 types of 3kW solar systems that you can choose for your home. Each differs in terms of price, solar energy output, capabilities, and overall energy efficiency levels. So, when picking the right type for your home, you need to carefully consider your electricity needs and budget against the characteristics you will choose.

There are primarily 3 main types of solar systems for your home, they are,

  • On-grid 3kW solar system
  • Off-grid/ Stand-alone 3kW solar system
  • Hybrid 3kW solar system

On-Grid 3kW Solar System

An on-grid 3kW solar system, also known as a grid-feed or grid-tied solar system, is a common choice for homeowners looking for a low-cost solar energy option. You will need solar panels and a solar inverter to put together a 3kW on-grid home solar system. This type of solar system starts generating energy only when it’s connected to the electric grid.

Off-Grid 3kW Solar System

The key feature of this off-grid 3kW solar system is that it is not connected to the conventional power framework, i.e., the government grid. Hence, an off-grid 3kW solar system is also known as a stand-alone 3kW solar system. This type of solar energy system is self-sufficient in generating electricity and can address excess solar energy production and any unexpected high power demand at your home.

Hybrid 3kW Solar System

A hybrid 3kW solar system combines the best features of both on-grid and off-grid solar power systems. The system is connected to the grid and has the advantage of battery storage, ensuring a 24-hour electricity supply is enough for a year. This system generates energy during peak hours of sunlight, and in case of surplus production, the excess energy is exported to the grid via a net metering system. 

What is the Net Metering System?

It is a mechanism that allows homeowners to feed excess electricity back into the grid. During the high solar production period and when the demand is low, the process involves sending the energy to the grid, and the owner receives credit. During the low solar production period, such as at night, the electricity is drawn from the grid to ensure a continuous and reliable power supply.

Price of a 3kW Solar System in India

Factors such as the type of system, quality of solar components, location, availability, and efficiency of solar panels determine the price of the 3kW solar system you will use for your home. However, with government subsidies on residences, solar panel installations are made even more affordable and beneficial.

The Ministry of New and Renewable Energy (MNRE) offers a 40% subsidy on residence solar plants with a capacity of up to 3kW. This subsidy applies to both on-grid and off-grid systems, excluding battery costs. However, there is a 20% subsidy for solar systems with a capacity of up to 10kW.

Here is an average estimate of India’s 3kW rooftop solar panel system.

Types of Solar Plant Total Initial Investment (INR) Pay Back Period
3kW Solar plant without subsidy 1,22,979 4 years
3kW Solar plant with subsidy 73,787 <2.5 years

Source: Business Today*

Here is an average estimate of different 3kW rooftop solar panel systems in India.

Model 3kW Solar Price without Subsidy (INR) 3kW Solar Price with Subsidy (INR)
3kW On-grid solar system 1,80,000 – 3,75,000 From 180,000
3kW Off-grid solar system 1,25,000 – 1,80,000
3kW Hybrid solar system 2,52,225 78,000

Source: Business Today*

Note: Subsidies for residences are available only for installations in neighbourhoods and houses. To install solar panels in your home, you can visit the National Portal for Rooftop Solar website and submit your subsidy application online.

Installation Process of 3KW Rooftop Solar System

Solar panels are typically installed on rooftops or open yards around 250-300 square feet of space. The rooftop provides an ideal space to generate sunlight without occupying additional ground areas. The direction and angle of the rooftop solar panels play a prominent role in maximising energy efficiency.

Power Generation and Output

A 3kW rooftop solar system generates 12-15 units of electricity daily, 360 units per month, or 4,320 units per year. This estimate is based on an average of 4-6 hours of sunlight, which can vary depending on seasonal changes, sunlight hours, system efficiency, and geographic location. This is enough to generate electricity to run a family of 3 or 4 in an average-sized home.

The appliances that will powered by solar include refrigerators, air conditioners, multiple lights & fans, washing machines, and LEDs to the overall electricity consumption of a household.

Environmental Benefits

Opting for solar power offers various environmental benefits, including a significant reduction in greenhouse gas emissions. Solar panels continue to generate electricity for over 25 years with less environmental impact, contributing to cleaner energy. Additionally, solar panel installation has been made more affordable than ever with government subsidies in place, which will contribute to lower annual utility bills.

Investing in a 3kW solar system offers sustainable and economically viable solutions to meet energy needs while reducing carbon footprints. Now that you understand all about the 3kW rooftop solar system, you can make an informed decision toward a greener future with the help of Fenice Energy.

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