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The 20 kW system is expected to save up to ₹288,000 annually, with a payback period of 3.5 to four years
September 4, 2026
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Residential rooftop systems have been driving India’s rooftop solar capacity additions, especially after the introduction of the PM Surya Ghar: Muft Bijli Yojana in 2024. Over 5 million households have benefited from the program so far.
According to Mercom’s Q2 and 1H 2026 India Rooftop Solar Market Report, residential installations accounted for 84% of the total rooftop solar additions in the country during the second quarter of the calendar year 2026,
Apartment complexes are increasingly turning to rooftop solar to  lower common area electricity expenses, limit exposure to rising grid tariffs, and meet a part of their daytime power requirements through on-site generation.
Common loads such as lifts, water pumps, lighting, security systems, swimming pools, and other shared facilities can make residential complexes suitable for rooftop solar installations, particularly where adequate roof space is available.
Vintage View, a residential apartment complex in Thiruvananthapuram, Kerala, has installed a 20 kW rooftop solar system to reduce its electricity bills.
Wattsun Energy India installed the solar system. According to the installer, high electricity bills were the primary reason for adopting rooftop solar.
Before the solar installation, the property consumed approximately 75 kWh to 100 kWh of electricity per day. Monthly consumption ranged from around 2,200 kWh to 3,000 kWh, corresponding to annual electricity consumption of approximately 27,000 kWh to 36,000 kWh.
The rooftop installation is expected to generate approximately 2,400 kWh of electricity per month.
Based on Wattsun’s estimates, the installation could result in electricity bill savings of ₹19,200 (~$202) to ₹24,000 (~$252) per month. Annual savings are estimated at approximately ₹230,000 (~$2,415) to ₹288,000 (~$3,024).
The installer expects the investment to achieve full payback for the apartment complex within 3.5 to four years.
The project uses Adani Solar modules rated above 550 W and a Sungrow inverter. The modules have been installed on a galvanized steel mounting structure.
Limited rooftop space and shade from surrounding obstructions were among the main challenges that the Wattsun team faced while executing the project. Wattsun designed an elevated mounting structure to improve solar exposure while allowing the area underneath the installation to remain usable.
The company also used a non-invasive anchoring system for the structure. Wattsun handled coordination with the distribution company for net metering and grid approvals.
“Our experience combined with our zest for innovation helps us develop solar solutions that stand the test of time. We are committed to delivering top-tier quality using tier-1 components to ensure optimal performance, maximum energy savings, and a swift return on investment for our clients,” said Terance Alex, Founder and CEO of Wattsun Energy.
Last October, Wattsun Energy executed a 300 kW rooftop solar system at the Cyberpark in Kozhikode, Kerala, to advance its sustainability goals and make productive use of parking and shaded areas.
To raise awareness about the benefits of solar projects, Mercom India hosts a pan-India C&I Clean Energy Meet series, bringing renewable energy developers and commercial and industrial power consumers together to discuss clean energy adoption. The next event in the series will be held in Visakhapatnam on September 24, 2026.
Arjun Joshi
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