Rooftop Solar & Electricity Bill Savings Estimator

How the Rooftop Solar & Electricity Bill Savings Estimator Works

Enter monthly electricity usage (kWh or billing amount), usable rooftop area, azimuth, tilt, and shading category alongside net-metering or net-billing export tariff rules. Optional location irradiance integrates EC JRC PVGIS v5.3 on a privacy-preserving 0.05-degree grid while manual entry operates completely standalone.

Key Inputs & Verification Data

• City/region or postal code (manual entry or opt-in geolocation)
• Monthly electricity usage (kWh) or monthly utility bill band
• Rooftop shading profile & net-metering tariff preference

Jurisdiction Tariffs, Subsidies & Transparent Financial Boundaries

Model outputs separate solar-only and solar-plus-battery Conservative, Base, and Optimistic ranges across 10 years. Calculations retain unavoidable fixed monthly meter charges, separate unconfirmed subsidies (such as India PM Surya Ghar or US Section 25D post-2025 expiration status) from confirmed net system costs, and never promise zero utility bills.

Coarse city or postal zone is sufficient when released; address or geolocation will never be collected on page load or logged verbatim.

Frequently Asked Questions

Does estimating rooftop solar savings require my exact street address?

No. Manual irradiance and bill entry work completely locally, and optional regional lookup uses coarse 0.05-degree grid resolution rather than street-level tracking.

Why do solar bills rarely drop to zero even with net metering?

Utilities apply fixed monthly connection fees, minimum demand charges, and time-of-use or export compensation caps regardless of net kWh generated.