# Rooftop Solar Subsidy & Savings Calculator

> Work out the PM Surya Ghar subsidy on a home rooftop system, your monthly bill savings and the payback time.

- Page: https://www.brandbakery.tech/tools/solar-subsidy-calculator
- Last updated: 2026-10-21

Breadcrumb: [Home](https://www.brandbakery.tech/) > [Tools](https://www.brandbakery.tech/tools) > Rooftop Solar Subsidy & Savings Calculator

Enter a system size, your state and your price per unit. See the PM Surya Ghar central subsidy, the cost after it, the units and money saved each month, and the years to pay it back.

## Use it

Open the tool in a browser at https://www.brandbakery.tech/tools/solar-subsidy-calculator. It is free and needs no signup.

## Use it from code

PM Surya Ghar central subsidy for a home rooftop solar system (MNRE guidelines, amended July 2025), the cost after it, monthly units and bill savings, and payback years.

`POST https://www.brandbakery.tech/api/tools/solar_subsidy` with a JSON body, or call the `solar_subsidy` tool on the [MCP server](https://www.brandbakery.tech/mcp).

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `kw` | number | yes | System size in kW. |
| `specialCategory` | boolean | no | True for Uttarakhand, Himachal Pradesh, J&K, Ladakh, the North East including Sikkim, Andaman & Nicobar or Lakshadweep. |
| `unitsPerKwPerDay` | number | no | Average daily units per kW. |
| `tariff` | number | yes | Price per unit of electricity, in rupees. |
| `systemCost` | number | no | Quoted system cost in rupees. Defaults to the MNRE benchmark cost. |

## Questions owners ask

**How much is the PM Surya Ghar subsidy?** For a home, the central subsidy is ₹30,000 per kW for the first 2 kW and ₹18,000 for the 3rd kW, so ₹78,000 at most; there is no extra subsidy beyond 3 kW. In special category states and UTs it is ₹33,000 and ₹19,800 per kW. Housing societies and RWAs get ₹18,000 per kW (₹19,800 in special category areas) for common facilities, up to 500 kW. Source: MNRE operational guidelines, amended 7 July 2025.

**Who can claim it?** Residential consumers who install a rooftop system with domestically made panels and cells through the national portal, pmsuryaghar.gov.in. States and UTs may add their own subsidy on top. The guidelines run the scheme until 31 March 2027.

**How many units does 1 kW of solar make?** MNRE's rooftop FAQ says one kW can generate 4 to 5.5 units on a clear sunny day. Across the year, with cloudy and monsoon days, an average of 3 to 4 units a day is a safer planning figure; PIB says a 3 kW system can generate over 300 units a month on average.

**What size system do I need?** PIB's guide: 1 to 2 kW for up to 150 units a month, 2 to 3 kW for 150 to 300 units, and above 3 kW for more than 300 units. Check your roof space and sanctioned load with your installer.

**Is the benchmark cost what I will pay?** No. MNRE's benchmark (₹50,000 per kW for the first 2 kW and ₹45,000 for each kW after, higher in special category areas) is the figure the subsidy was set against. Real quotes vary by brand, roof and installer, so enter your quote for an accurate payback.

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Brand Bakery is a design-first digital studio in New Delhi. Start an enquiry at https://www.brandbakery.tech/contact or email support@brandbakery.tech. This is the Markdown copy of https://www.brandbakery.tech/tools/solar-subsidy-calculator; the site index for language models is https://www.brandbakery.tech/llms.txt.