Reference 1
- System size
- 1 kW
- Roof area
- 100 sq ft
- Annual generation
- About 1,460 kWh
- Best suited for
- Small household load
দৈনন্দিন
Solar Rooftop Savings Calculator
Estimate rooftop solar system size, PM Surya Ghar subsidy, net installation cost, annual savings, and payback period for Indian homes.
সূত্ৰৰ ব্যাখ্যা
System kW = min(monthly units / 120, rooftop area / 100); payback = net cost / annual savingsA 1 kW rooftop system needs roughly 100 sq ft and generates about 4 kWh per day. The calculator sizes the plant by electricity demand and available roof area.
Step-by-Step Example
- 1Convert monthly bill into monthly electricity units using tariff per kWh.
- 2Estimate required system size using 4 kWh/day generation per kW.
- 3Limit system size by available roof area and estimate installation cost at INR 65,000 per kW.
- 4Apply central subsidy estimate, calculate annual generation, bill savings, and payback period.
Reference
Benchmark Table
Compare common scenarios quickly. Scroll horizontally on smaller screens.
Reference 2
- System size
- 2 kW
- Roof area
- 200 sq ft
- Annual generation
- About 2,920 kWh
- Best suited for
- Moderate bill reduction
Reference 3
- System size
- 3 kW
- Roof area
- 300 sq ft
- Annual generation
- About 4,380 kWh
- Best suited for
- Common subsidized home setup
Reference 4
- System size
- 5 kW
- Roof area
- 500 sq ft
- Annual generation
- About 7,300 kWh
- Best suited for
- Larger independent home
সঘনাই সোধা প্ৰশ্ন
A practical thumb rule is about 100 sq ft per 1 kW of rooftop solar capacity, depending on panel type and layout.
Payback period is net upfront cost after subsidy divided by estimated annual electricity bill savings.
No. It includes a central subsidy estimate only. State incentives, DISCOM rules, net metering, and installation quotes vary.
It can reduce most energy charges if sized well, but fixed charges, minimum bills, and net-metering rules may still apply.
Recommended system size
5.21 kW