Complete Cost Breakdown of a 6kW Solar System and 6.6 kW Solar System in 2025
Complete Cost Breakdown of a 6kW Solar System and 6.6 kW Solar System in 2025
As more homeowners make the switch to solar energy in 2025, understanding the costs of different system sizes is essential. Two commonly installed options are the 6kW solar system and the 6.6 kW solar system. Though close in size, they differ in power output, installation needs, and total cost.
This article breaks down every major cost component to help you decide which solar system fits your home and budget best.
⚡ What’s Included in the Cost?
The total price of a 6kW solar system or 6.6 kW solar system usually includes:
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Solar panels
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Inverter (string or microinverter)
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Mounting structure
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Wiring, conduit, and protection devices
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Installation labor
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Net metering setup
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GST and other taxes
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Government subsidy (if applicable)
💰 Cost of a 6kW Solar System in 2025
| Component | Approximate Cost (INR) |
|---|---|
| Solar Panels (Tier-1) | ₹1,20,000 – ₹1,40,000 |
| Inverter (On-grid) | ₹35,000 – ₹45,000 |
| Mounting Structure | ₹15,000 – ₹20,000 |
| Wiring & Protections | ₹10,000 – ₹15,000 |
| Installation & Labour | ₹10,000 – ₹15,000 |
| GST & Other Charges | ₹15,000 – ₹20,000 |
| Total (Before Subsidy) | ₹2.5 – ₹3.2 Lakhs |
| With Subsidy (up to 40%) | ₹1.8 – ₹2.2 Lakhs |
✅ Ideal for: Medium-sized homes, average monthly usage of 700–800 units.
💰 Cost of a 6.6 kW Solar System in 2025
| Component | Approximate Cost (INR) |
|---|---|
| Solar Panels (Tier-1) | ₹1,32,000 – ₹1,55,000 |
| Inverter (6.6kW Rated) | ₹40,000 – ₹50,000 |
| Mounting Structure | ₹16,000 – ₹22,000 |
| Wiring & Protections | ₹12,000 – ₹18,000 |
| Installation & Labour | ₹12,000 – ₹18,000 |
| GST & Other Charges | ₹18,000 – ₹22,000 |
| Total (Before Subsidy) | ₹2.7 – ₹3.4 Lakhs |
| With Subsidy (up to 40%) | ₹1.9 – ₹2.4 Lakhs |
✅ Ideal for: Homes with high energy usage or plans to add EVs or battery backup in the future.
📊 Side-by-Side Cost Comparison
| Feature | 6kW Solar System | 6.6 kW Solar System |
|---|---|---|
| Power Output (Daily) | 24–26 units | 26–29 units |
| Total Cost (before subsidy) | ₹2.5 – ₹3.2 Lakhs | ₹2.7 – ₹3.4 Lakhs |
| With Subsidy | ₹1.8 – ₹2.2 Lakhs | ₹1.9 – ₹2.4 Lakhs |
| Payback Period | 4–5 years | 3.5–5 years |
🏡 Long-Term Savings & ROI
A 6.6 kW solar system may cost slightly more, but it generates 8–12% more electricity than a 6kW solar system. Over 20+ years, that difference adds up to significant savings.
Both systems offer fast payback periods and 25+ years of panel life, making them great investments for homeowners in 2025.
📐 Roof Space Requirements
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6kW Solar System: Needs 400–450 sq. ft.
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6.6 kW Solar System: Needs 450–500 sq. ft.
If you have the extra space, upgrading to 6.6 kW may be a smart decision.
✅ Final Thoughts
If you’re on a tighter budget or have limited roof space, a 6kW solar system is cost-effective and efficient for mid-sized homes. But if you want more long-term savings and have slightly higher energy usage, the 6.6 kW solar system delivers better output and future-proofing for a modest additional cost.
