As electricity costs continue to rise and sustainability becomes a shared responsibility, apartments and housing societies across India are actively exploring cleaner and smarter energy solutions. One of the most effective and future-ready options is installing a Rooftop Solar Plant.

At Trom Industries Limited, we work closely with residential communities to help them transition to reliable solar power systems that reduce electricity bills, ease grid dependency, and contribute to a greener environment. In this article, we explain everything housing societies and apartment associations should know before installing a rooftop solar plant—from how it works to long-term benefits and practical considerations.

What Is a Rooftop Solar Plant?

A Rooftop Solar Plant is a photovoltaic (PV) power system installed on the roof of a building to generate electricity using sunlight. In apartments and housing societies, this system typically supplies power to common areas such as lifts, staircases, parking lights, water pumps, clubhouses, and security systems.

Unlike large ground-mounted solar plants, rooftop systems efficiently utilize existing building roofs and curtain walls—without requiring any additional land resources. This makes them ideal for residential complexes in urban and semi-urban areas.

How a Residential Rooftop Solar Power System Works

The residential solar power system uses photovoltaic panels to convert sunlight into electricity. This electricity is then used to run building loads, and surplus power—if available—can be supplied back to the electricity grid.

Key Working Principle:

• Solar panels generate electricity during daylight hours
  
  

• Generated power is first used to meet the building’s internal load
  
  

• Excess electricity is exported to the grid (in on-grid systems)
  
  

• The system helps relieve peak electricity demand during daytime hours
  
  

This not only reduces monthly electricity bills but also stabilizes power consumption during high-demand periods.

Why Rooftop Solar Plants Are Ideal for Apartments & Housing Societies

Residential societies often face high recurring electricity expenses for common facilities. A rooftop solar plant directly addresses this issue while offering multiple long-term advantages.

1. Efficient Use of Available Roof Space

Apartment buildings have large, unused rooftop areas. A rooftop solar plant converts this idle space into a productive energy asset—without affecting daily life or aesthetics when designed professionally.

2. Reduced Electricity Bills for Common Areas

Solar power offsets grid electricity usage for common services, leading to significant savings in monthly maintenance costs for residents.

3. Relief from Peak Power Demand

Since solar systems generate electricity during the day, they reduce dependence on grid power during peak demand hours, which is when electricity tariffs are often highest.

4. Environmentally Responsible Living

Using solar energy lowers carbon emissions and supports India’s renewable energy goals. It allows housing societies to actively participate in sustainable development.

5. Long-Term Financial Benefits

Once installed, rooftop solar plants deliver free electricity for 25 years or more, with minimal maintenance costs.

Capacity Planning for Residential Rooftop Solar Plants

Every apartment complex is different. The ideal rooftop solar plant capacity depends on factors such as roof area, daily electricity consumption, and budget.

At Trom Industries Limited, we offer a wide range of rooftop solar plant capacities—from 1 kW to 1 MW, making our solutions suitable for:

• Small apartment buildings
  
  

• Large housing societies
  
  

• Gated residential communities
  
  

• Mixed-use residential complexes
  
  

Our experienced team conducts detailed site surveys and energy audits to recommend the most efficient and cost-effective system size.

Types of Rooftop Solar Systems for Housing Societies

On-Grid Rooftop Solar Plant

• Connected to the electricity grid
  
  

• Excess power is exported via net metering
  
  

• Ideal for societies with stable grid supply
  
  

• Lower upfront cost
  
  

Hybrid Rooftop Solar Plant

• Connected to the grid with battery backup
  
  

• Provides power during outages
  
  

• Suitable for areas with frequent power cuts
  
  

We help societies choose the right system based on energy needs, grid reliability, and long-term goals.

Net Metering for Apartments and Housing Societies

Net metering is a crucial benefit of installing a rooftop solar plant. It allows housing societies to export surplus electricity to the grid and receive credits on their electricity bill.

This mechanism ensures:

• Maximum utilization of generated solar power
  
  

• Faster return on investment
  
  

• Transparent billing and energy accounting
  
  

Our team assists with the complete net metering approval and documentation process.

Design, Quality, and Expertise That Set Us Apart

At Trom Industries Limited, we believe a rooftop solar plant should be efficient, durable, and future-ready.

Our Strengths:

• A separate, highly qualified, knowledgeable, and experienced solar team
  
  

• Novel system designs optimized for residential rooftops
  
  

• High-quality PV modules, inverters, and mounting structures
  
  

• Full-function systems with safety and performance monitoring
  
  

• Compliance with all technical and regulatory standards
  
  

From design to commissioning, we ensure every rooftop PV system delivers reliable performance for decades.

Installation Process for Rooftop Solar Plants

We follow a structured and transparent installation process to ensure smooth execution:

1. Site inspection and feasibility analysis
   
   

2. Load assessment and capacity finalization
   
   

3. System design and engineering
   
   

4. Approvals and net metering coordination
   
   

5. Installation and testing
   
   

6. Commissioning and handover
   
   

Our approach minimizes disruption to residents while ensuring timely project completion.

Maintenance and System Life

Rooftop solar plants are known for low maintenance requirements. Routine cleaning and periodic inspections are enough to keep the system running efficiently.

Typical system lifespan:

• Solar panels: 25+ years
  
  

• Inverters: 8–12 years (replaceable)
  
  

With proper maintenance, housing societies can enjoy decades of clean, low-cost electricity.

Government Support and Future Readiness

Residential solar adoption is strongly supported by national and state renewable energy policies. Rooftop solar plants align with long-term energy planning and help societies stay future-ready amid rising electricity costs.

Solar-powered housing societies are increasingly seen as:

• More sustainable
  
  

• Better planned
  
  

• Higher in long-term property value
  
  

Why Choose Trom Industries Limited?

We are not just solar installers—we are long-term energy partners.

• Proven expertise in rooftop solar projects
  
  

• End-to-end solutions from 1 kW to 1 MW
  
  

• Transparent processes and quality-first approach
  
  

• Dedicated post-installation support
  
  

We sincerely welcome your purchase and the opportunity to help your housing society transition to clean solar energy.

Frequently Asked Questions (FAQs)

1. Is a rooftop solar plant suitable for all apartments?

Yes. Most apartments and housing societies with sufficient roof space can install a rooftop solar plant after structural and technical evaluation.

2. How much roof area is required for a rooftop solar plant?

On average, 100 square feet of shadow-free area is required per 1 kW of installed capacity.

3. Can solar power run lifts and water pumps?

Yes. Rooftop solar plants are commonly used to power lifts, water pumps, and common lighting systems.

4. What happens if solar power generation exceeds usage?

Excess electricity is exported to the grid through net metering, earning bill credits.

5. How long does installation take?

Most residential rooftop solar projects are completed within 4–8 weeks, depending on size and approvals.

6. Is maintenance expensive?

No. Maintenance costs are low and mostly involve panel cleaning and routine inspections.

7. Can a housing society install a large-capacity solar plant?

Yes. Trom Industries Limited offers rooftop solar plant capacities up to 1 MW for large residential complexes.

Final Thoughts

A Rooftop Solar Plant is no longer just an alternative—it is a smart, responsible, and financially sound decision for apartments and housing societies. By utilizing unused rooftop space, residential communities can reduce electricity costs, support clean energy, and build a sustainable future.

At Trom Industries Limited, we are committed to delivering high-quality rooftop solar solutions that combine performance, reliability, and long-term value. If your housing society is planning to go solar, we are here to guide you every step of the way.