NoteMide India rooftop solar planning tools

Rooftop Solar Panel Calculator India

Estimate a preliminary rooftop solar system for an Indian home, apartment, business, or industrial site. Start with a typical monthly electricity bill, State or Union Territory, customer category, and an editable electricity cost per unit. Add usable roof area, panel wattage, and a target bill offset to see an indicative system size, panel count, generation, cost, residential central-assistance context, savings, and simple payback.

How the rooftop solar estimate works

The calculator converts a typical monthly bill into an approximate monthly unit figure using the editable planning tariff. It then compares the target annual generation with an indicative roof-area limit and uses the selected panel wattage to estimate panel count. The generation and cost values are planning assumptions, not a site survey, installer quote, or guaranteed production statement.

State and customer category matter

State or Union Territory and customer category help frame the result because electricity tariffs, DISCOM procedures, net-metering rules, approvals, and subsidy eligibility can differ. Residential central financial assistance is not automatically available to commercial or industrial customers. The calculator keeps the unit rate editable because a monthly bill can include fixed charges, taxes, arrears, seasonal changes, and slab pricing that a simple average cannot fully represent.

What can change the final result

Roof shade, orientation, structure, panel technology, inverter selection, wiring, installation, GST, export credits, maintenance, downtime, local approval, and the official subsidy decision can all change the outcome. Confirm current PM Surya Ghar and State or DISCOM information through official sources before purchasing. Use the result to compare scenarios and prepare questions for a qualified installer or engineer.

Related planning topics

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