A 5 kW on-grid solar system is a solar electricity generation setup connected to the utility grid, ideal for medium- to large-sized homes or small businesses with high electricity consumption (around 600-800 units per month). It operates without batteries and is highly efficient for reducing electricity bills through a process called net metering.
Key Components
A complete 5 kW on-grid solar system typically includes:
Solar Panels (approx. 5 kW total capacity): Usually 10-16 high-efficiency panels requiring about 400-600 sq. ft. of shadow-free rooftop space.
On-Grid Inverter (5 kW): A crucial component (usually a string inverter with MPPT technology) that converts the DC power generated by the panels into usable AC power for your home and the grid. It also has a safety feature (anti-islanding) that automatically shuts down the system during a power outage to protect utility workers.
Mounting Structure: A robust galvanized iron or aluminum structure to securely install the panels on the roof with the optimal tilt and orientation.
Balance of System (BoS): This includes necessary electrical components such as:
DC and AC cables
MC4 connectors
Junction boxes (ACDB and DCDB) with MCBs, fuses, and surge protection
Earthing and lightning protection system
Net Meter: A bi-directional meter installed by the local electric utility (DISCOM) to record the excess electricity exported to the grid and the power drawn from it when solar generation is insufficient.
Performance and Benefits
Electricity Generation: A 5 kW on-grid system can generate approximately 20 to 25 units (kWh) of electricity per day on average, depending on location, sunlight hours, and weather conditions. Annually, this amounts to roughly 7,000-8,000 units.
Savings and ROI: It can significantly reduce your electricity bills (up to 70-90%) and offers a relatively quick payback period of around 3 to 5 years.
Subsidy: In India, residential users can be eligible for a central government subsidy (around ₹78,000 for a 5-kW system under the PM Surya Ghar Muft Bijli Yojana as of 2025), which can lower the initial cost.
Lifespan: Solar panels typically have a lifespan of 25 years or more, while the inverter may need replacement after 10-12 years.
Estimated Cost
The price for a 5 kW on-grid solar system in India generally ranges from ₹1,80,000 to ₹2,50,000 before any subsidies, but the final cost after subsidies can be lower, varying by state, brand, and component quality.