How the SolarHomeTech rooftop solar analysis works

See how our rooftop solar calculator turns your address, roof, and tariff inputs into PV yield, self-consumption, exports, and solar savings estimates using European irradiance data (PVGIS) and transparent financial modelling.

We blend rooftop geometry, PVGIS typical meteorological year irradiance, tariff assumptions, and your demand profile to model PV yield, self-consumption, exports, and cash flow.

1. Inputs capture the site

Postal code, roof area, tilt, azimuth, and shading define location and usable PV surface.

2. Location unlocks weather data

We geocode the site and request PVGIS typical meteorological year irradiance for that coordinate.

3. Array size is inferred

Roof area is converted to peak power using 1 kWdc per 1.75 m2 plus 85% packing density to keep layouts realistic.

4. Energy balance is modelled

Monthly PV output is compared to a people-based consumption profile to compute self-use and exports.

5. Cash flow is projected

System cost, feed-in credit, and retail replacement value create annual savings and a payback estimate.

Key calculations at a glance

Key parts of the PV yield model, solar savings estimate, and energy balance.

Usable array size: roof_area_m2 x 0.85 / 1.75 = kWdc
Self-consumed energy: min(PV_output, consumption_profile)
Annual savings: (self_consumed x retail_price) + (exports x feed_in_price x feed_in_ratio)

Learn more in our full methodology and explore European case studies. Ready to model your roof? Jump into the rooftop solar calculator. Review the methodology, see solar case studies, or run your own rooftop solar analysis.

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