Are you wondering:
- How many kW solar system do I need for my home?
- What is the right solar capacity based on my electricity bill?
- How much subsidy can I get under PM Surya Ghar Yojana?
- Is rooftop solar worth it in West Bengal?
- How much can I save with solar?
You are not alone.
These are the most common questions homeowners ask before installing rooftop solar.
The good news is that with PM Surya Ghar Muft Bijli Yojana, net metering availability, financing options, and modern high-efficiency solar technology, residential solar has become one of the most attractive long-term investments for homeowners.
This comprehensive guide will help you calculate the ideal solar capacity for your home, estimate savings, understand subsidy benefits, and choose the right rooftop solar system.
Solar Capacity Calculator for Home
Actual system sizing depends on:
- Monthly electricity consumption
- Roof area available
- Roof orientation
- Shading conditions
- Sanctioned load
- Future electricity requirements
Calculate your Solar requirement for Home- Solar Saving Calculator
Why Now Is the Best Time to Install Residential Solar
Three major factors have made residential solar highly attractive:
1. PM Surya Ghar Subsidy
Eligible residential consumers can receive government subsidy benefits.
2. Net Metering
Excess solar power can be exported to the electricity grid.
3. Financing Options
Many homeowners can install solar using EMI and solar financing options instead of paying the entire amount upfront.
PM Surya Ghar Subsidy Calculator
Indicative subsidy benefits:
| Solar Capacity | Indicative Subsidy |
| 1 kW | ₹30,000 |
| 2 kW | ₹60,000 |
| 3 kW | ₹78,000 |
| 4 kW to 10 kW | Subsidy capped as per prevailing government guidelines |
The 3 kW system often delivers one of the strongest subsidy-to-investment ratios for many residential consumers.
Subsidy policies are subject to government guidelines and eligibility requirements.
Residential Solar System Price After Subsidy
Indicative pricing:
| Capacity | Indicative Investment | Indicative Subsidy | Net After Subsidy |
| 1 kW | ₹90,000 + GST | ₹30,000 | ₹60,000 + GST |
| 2 kW | ₹1,50,000 + GST | ₹60,000 | ₹90,000 + GST |
| 3 kW | ₹2,10,000 + GST | ₹78,000 | ₹1,32,000 + GST |
| 4 kW | ₹2,60,000 + GST | ₹78,000 | ₹1,82,000 + GST |
| 5 kW Single Phase | ₹3,10,000 + GST | ₹78,000 | ₹2,32,000 + GST |
| 5 kW Three Phase | ₹3,35,000 + GST | ₹78,000 | ₹2,57,000 + GST |
| 6 kW | ₹3,80,000 + GST | ₹78,000 | ₹3,02,000 + GST |
| 7 kW | ₹4,40,000 + GST | ₹78,000 | ₹3,62,000 + GST |
| 8 kW | ₹4,70,000 + GST | ₹78,000 | ₹3,92,000 + GST |
| 9 kW | ₹4,85,000 + GST | ₹78,000 | ₹4,07,000 + GST |
| 10 kW | ₹5,20,000 + GST | ₹78,000 | ₹4,42,000 + GST |
Prices are indicative and subject to site conditions, structure type, electrical modifications, and prevailing material costs.
How Much Electricity Does a Solar System Generate?
One of the most searched questions is:
How much electricity does a 1 kW solar system generate?
A professionally designed rooftop solar system can generate approximately:
1300 to 1450 units per kW annually
Depending on:
- Geographic location
- Roof direction
- Roof tilt
- Weather conditions
- System design quality
Estimated generation:
| System Size | Annual Generation |
| 1 kW | 1300–1450 Units |
| 2 kW | 2600–2900 Units |
| 3 kW | 3900–4350 Units |
| 5 kW | 6500–7250 Units |
| 10 kW | 13000–14500 Units |
How Many Solar Panels Do I Need?
Using modern high-wattage DCR-compliant solar modules:
| Capacity | Approximate Panels Required |
| 1 kW | 2 Panels |
| 2 kW | 4 Panels |
| 3 kW | 5–6 Panels |
| 5 kW | 8–10 Panels |
| 10 kW | 16–18 Panels |
Actual quantities depend on module wattage and available roof area.
What Roof Types Can Support Solar?
RCC Concrete Roof
Most common residential installation type.
Benefits:
- Long life
- Flexible design
- Excellent structural strength
Elevated Fabricated Structures
Popular for premium residential projects.
Benefits:
- Terrace remains usable
- Better ventilation
- Improved aesthetics
- Increased panel performance
Ballast Structure
Ideal when roof penetration must be minimized.
Benefits:
- Waterproofing friendly
- Stable design
- Quick installation
GI Sheet Roof Installation
Perfect for homes with sheet roofing.
Benefits:
- Lightweight
- Fast installation
- Excellent performance
What Is Included in a SolarLogix Residential Solar System?
A professionally engineered rooftop solar installation includes:
- DCR Solar Panels
- Grid-Tied Inverter
- Mounting Structure
- AC Distribution Box
- DC Distribution Box
- Lightning Arrestor
- AC Earthing
- DC Earthing
- Equipment Earthing
- AC Cable
- DC Cable
- Earth Cable
- Testing & Commissioning
- Net Metering Assistance
- Documentation Support
Warranty & Insurance Benefits
A rooftop solar system is a long-term asset.
Typical coverage includes:
Solar Panels
Up to 25-Year Performance Warranty
Inverters
Up to 8-Year Manufacturer Warranty
System
5-Year Comprehensive Warranty
Additional Insurance Options
Coverage options may include:
- Fire
- Theft
- Natural calamities
- Electrical damage
- Accidental damage
What Is Net Metering?
Net metering allows homeowners to export surplus solar electricity to the grid.
During the day:
- Solar generates power
- Home consumes available energy
- Excess power is exported
At night:
- Power is imported from the grid
This helps maximize the value of rooftop solar.
Why Professional Engineering Matters
Not all solar systems are equal.
The difference between a low-cost installation and a professionally engineered solar system can impact:
- Energy generation
- Safety
- Reliability
- Service support
- Long-term savings
SolarLogix follows an engineering-first approach focused on:
- Premium installation standards
- Advanced system design
- Quality workmanship
- Safety compliance
- Ongoing support
- Monitoring solutions
As an award-winning EPC and Tata Power Solar Channel Partner, SolarLogix has delivered projects across industrial, commercial, institutional and rooftop segments with a strong focus on quality and long-term performance.
Frequently Asked Questions
How many kW solar system do I need for my home?
A simple estimate is 1 kW for every ₹1,000 of monthly electricity bill, subject to detailed assessment.
Is 3 kW enough for a house?
For many households with electricity bills around ₹3,000 per month, a 3 kW system may be suitable.
How much subsidy can I get?
Eligible residential consumers may receive subsidy benefits under prevailing PM Surya Ghar guidelines.
Can I install solar on a sheet roof?
Yes. Specialized mounting structures are available for GI sheet roofs.
Does solar work during monsoon?
Yes, although generation is lower compared to bright sunny days.
Is net metering available?
Net metering availability depends on applicable DISCOM regulations and prevailing policies.
Get Your Free Personalized Solar Capacity Report
Simply share:
✓ Electricity Bill
✓ Google Location
✓ Rooftop Photos (Optional)
Receive:
- Recommended Solar Capacity
- Rooftop Feasibility Assessment
- Savings Analysis
- Subsidy Guidance
- Financing Options
- Preliminary System Design
Turn your rooftop into a 25-year energy asset and start your solar journey today.
