Buying solar in Bangalore involves BESCOM regulations, Karnataka-specific subsidies, monsoon considerations, and a market full of installers ranging from excellent to unreliable. This guide gives you everything you need to make a confident, well-informed decision.
Step 1: Understand Your Energy Consumption
Your starting point is your electricity bill. Look at the last 12 months of bills and calculate your average monthly consumption in units (kWh). In Bangalore, most 2–3 BHK apartments consume 200–350 units per month; independent houses and villas typically consume 400–800 units depending on air conditioning usage.
A correctly-sized system should generate 80–100% of your annual consumption. Oversizing wastes money; undersizing means you're still paying significant bills.
Step 2: Assess Your Rooftop
Not every roof is created equal. The key factors that affect how much solar your roof can generate are:
- Available area: Each kW of solar panels requires approximately 80–100 sq ft of usable roof space. A 5 kW system needs 400–500 sq ft.
- Shading: Trees, water tanks, and adjacent buildings casting shadow between 9am and 3pm significantly reduce generation. Even partial shading on one panel affects the whole string.
- Roof orientation: South-facing roofs generate the most power in India. East and west-facing slopes generate about 15–20% less. North-facing is least efficient.
- Roof structure: RCC (concrete) rooftops are easiest to work with. Mangalore tile and sheet roofs require specialist mounting — ensure your installer has experience with your roof type.
Bangalore receives excellent solar irradiance of 5.0–5.5 kWh/m²/day for most of the year. Even during the monsoon months (June–September), panels generate 60–70% of their peak capacity. Annual generation estimates for Bangalore are reliable and consistent.
Step 3: BESCOM Net Metering — What You Need to Know
Net metering allows your surplus solar generation to flow into the BESCOM grid, and your meter runs backwards — you get credited for every unit exported. The current BESCOM net metering export rate is approximately ₹3.50–₹4.50 per unit.
BESCOM's net metering application takes 30–60 days from installation. Your installer must handle the technical inspection and meter upgrade. SunVana manages the complete BESCOM filing process for all our installations.
Step 4: Comparing Solar Quotes
Once you receive quotes from 2–3 installers, compare them on these specific parameters — not just total price:
| Parameter | What to Look For | Red Flag |
|---|---|---|
| Panel brand | Tier-1: Jinko, LONGi, REC, Waaree, Adani | Unknown Chinese brands, no datasheet |
| Panel efficiency | Above 20% (PERC or TOPCon) | Below 18% |
| Inverter brand | Sungrow, SMA, Fronius, Delta, Growatt | No Indian service centre |
| Panel warranty | 25-year performance, 12-year product | Less than 10-year product warranty |
| Inverter warranty | 5 years minimum (10 preferred) | Less than 3 years |
| MNRE registration | Installer on PM Surya Ghar portal | Cannot confirm subsidy eligibility |
| Generation estimate | Based on site-specific shadow analysis | Generic estimate without roof assessment |
Step 5: What the Installation Process Looks Like
- Site survey (1–2 days): Engineer visits to measure roof, assess structure, check shading, and confirm system size.
- Design proposal (3–5 days): Detailed layout drawing, component list, generation estimate, and financial analysis.
- Subsidy application (15–30 days): BESCOM feasibility application and PM Surya Ghar portal registration.
- Installation (1–3 days): Mounting structure, panel placement, inverter and wiring installation.
- BESCOM inspection (15–30 days): BESCOM inspector visits and net meter replacement.
- System goes live: Inverter commissioned and system monitoring set up.
- Subsidy credited: Within 30 days of BESCOM commissioning report upload.
The Monsoon Question: Will Solar Work in Bangalore?
Yes — convincingly. Bangalore's monsoon season (June–September) sees reduced direct sunlight but panels still generate from diffuse light. A well-designed 5 kW system will generate 400–500 units/month even in heavy monsoon months, compared to 650–750 units in peak summer months. Annual generation estimates account for this seasonal variation.