Installing rooftop solar panels is one of the highest-yield financial investments a homeowner in Karnataka can make. However, sizing your system properly is essential to maximize return on investment.
1. Check Your Monthly Electricity Bill
Look at your past 6 to 12 months of electricity bills. Note the average units (kWh) consumed per month. A typical middle-class home consumes between 200 and 450 units per month.
In South India, 1 kW of well-oriented monocrystalline solar panels generates approximately 4 to 4.5 units per sunny day (about 120-135 units per month).
- Monthly consumption 250 units: A 2kW system is recommended.
- Monthly consumption 350 to 450 units: A 3kW system is optimal.
- Monthly consumption 600+ units (with multiple ACs): A 5kW system is recommended.
2. Measure Shadow-Free Roof Space
Every kilowatt of solar requires roughly 80 to 100 square feet of unobstructed, shadow-free rooftop space facing South or Southwest. Water tanks, parapet walls, and neighboring coconut trees should not cast shadows between 9:00 AM and 4:00 PM.
3. Choose Between On-Grid and Hybrid
If your area experiences stable grid power with minimal power cuts, an On-Grid Net Metering system is the most cost-effective solution and qualifies directly for the central government PM Surya Ghar subsidy. If you face frequent blackouts, a Hybrid Solar System with Lithium Battery storage ensures uninterrupted electricity.
4. Talk to Powerr Technologies
Our field technicians provide a free on-site survey across Mysuru and Mandya to inspect your roof structure and generate a customized engineering design.