Solar Sizing Calculator
Estimate the rooftop solar system that would offset your electricity use. Enter your monthly units (from your bill) and get the recommended system size (kW), the number of panels, the roof area needed, and the estimated yearly generation. This is an indicative planning aid — a proper site assessment by an empanelled installer sets the real design.
Find this on your electricity bill (average across the year is best).
India averages ~4 units per kW per day; sunnier regions and unshaded south-facing roofs are higher.
to offset ~300 units/month at 4 units per kW per day.
Size to your consumption, not bigger — net-metering rules may cap export, and an oversized system wastes money. Check the PM Surya Ghar subsidy and your state net-metering terms.
Indicative only. This uses an average generation figure and simple ratios; actual output depends on your location, roof orientation, shading, panel and inverter quality, temperature and soiling. Roof area and panel count are approximate. A proper site assessment by an empanelled installer, and your DISCOM’s net-metering and subsidy terms, set the real design and payback.
Related Guides — Deep-dive reading
The Solar Roof Guide
Putting rooftop solar on an Indian home, made clear — the system types (grid-connected, off-grid and hybrid, plus BIPV and solar tiles), how to judge whether your roof is ready (area, orientation, tilt, shading, structure and age), how panels are mounted and waterproofed, the electrical and fire-safety essentials, cleaning and access, indicative cost and payback, and the permissions, net-metering and subsidy path. Plain language, India-grounded.
RoofingRooftop Solar for Indian Homes: The Complete Guide
How rooftop solar actually works and pays back — the panels, inverter and net meter, the on-grid, off-grid and hybrid choice, how much roof and money a system needs, the PM Surya Ghar subsidy and net metering, and how to judge a good installation.
Electrical & WiringSolar Inverter Buying Guide (India): Choosing the PV Inverter (2026)
The PV inverter is the brain of a rooftop system: it turns panel DC into home AC and manages the grid tie. How to pick the type, size it to the array, compare the specs that matter, and buy an approved-list model for the subsidy.
Solar & EnergyRelated Tools — You may also find these useful
AI Electrical Assistant
Ask anything about your home's electrics in plain language — RCCBs, phases, backup, solar, tripping and more. Understand and decide; an electrician does the work.
AI ToolAI Electrical Brief Builder
An AI assistant that turns your needs into a clear electrical requirements brief — room-by-room points, circuits, protection, backup — to hand your electrician.
AI ToolAppliance Running Cost Calculator
See what any appliance costs to run — daily, monthly and yearly — from its wattage, hours of use and your electricity tariff.
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