What is the maximum subsidy I can receive on my house?

Under the PM Surya Ghar: Muft Bijli Yojana, residential individual homeowners receive ₹30,000 for 1 kW, ₹60,000 for 2 kW, and a maximum capped subsidy of ₹78,000 for 3 kW and higher capacities. In states like Uttar Pradesh or Delhi, state top-ups can add ₹15,000 to ₹30,000 or Generation-Based Incentives.

How much rooftop area do I need for a 3 kW solar plant?

Modern high-efficiency Mono PERC or TOPCon panels require approximately 80 to 90 square feet of shadow-free terrace area per kilowatt. Therefore, a standard 3 kW system requires between 240 and 270 sq ft of open rooftop space.

MNRE Official Sizing & DBT Subsidy Engine

Rooftop Solar Sizing & PM Surya Ghar Subsidy Calculator

Input your monthly power bill to determine ideal plant capacity, benchmark BoS expenditure, guaranteed central & state subsidies, and complete 25-year financial cash flow.

Configure Your Property

Live MNRE PM Surya Ghar calculations

2026 Rules

Premises Category

State & Grid Jurisdiction

Avg Tariff: ₹7.5/unit•Sun Hours: 4.8 hrs/day

Electricity Consumption

Average Monthly Bill:

₹1,000₹15,000₹30,000₹50,000+

Sanctioned Electricity Load4 kW

Mentioned on your DISCOM electric bill

Shadow-Free Rooftop Area400 sq ft

~85 sq ft needed per kW capacity

Your shadow-free roof area (400 sq ft) accommodates up to 4.7 kW. Sizing adjusted accordingly.

DISCOM net metering is capped at 100% of your sanctioned load (4 kW). We recommend applying for a load enhancement or sizing up to 4 kW.

Unbiased Sizing

4.7 kWp Rooftop Solar Plant

Generates ~582 units/month • Requires 408 sq ft terrace

Capex Payback

2.9 Years

Free power thereafter

Benchmark Cost

₹2,53,800

Tier-1 DCR

Central CFA

-₹78,000

Direct DBT

State Top-Up

-₹21,615

State Nodal

Net Investment

₹1,54,185

After all subsidies

Annual Savings

₹52,380 / yr

25-Yr Cumulative

₹20,35,060

Lifetime CO2 Offset

135 Tonnes

Net Capex Breakeven at Year 2.9Total Profit: ₹18,80,875

1. Sizing Algorithm

Calculated against regional solar irradiance data, DISCOM tariff tiers, and a conservative 0.6% annual degradation factor to avoid undersizing or grid rejection.

2. DCR Subsidy Lock

Only systems with verified Domestic Content Requirement (DCR) solar cells qualify for the ₹78,000 subsidy credited straight into your bank account.

3. Net Metering Approval

Your DISCOM replaces your conventional single-way meter with a bi-directional net meter, banking excess summer generation to offset winter consumption.

Frequently Asked Sizing Questions

We divide your monthly electricity consumption by 30 to determine daily units. Assuming an average of 4.2 to 4.5 peak sun hours in India and a standard 85% Performance Ratio (PR), 1 kWp of solar modules generates approximately 4.2 to 4.5 units per day (or ~125–135 units per month).