Solar savings estimator

Quick indicative estimate for your home — enter your postcode, place the pin on your property, then continue with a few simple choices. For surveyors and installers, our professional tool adds roof detail and PDF export.

  1. 1 · Location & map
  2. 2 · Your system
  3. 3 · Energy use
  4. 4 · Results

Where is your home?

Enter your postcode, tap Show map, and place the pin on your home. That position is used for your estimate so results match where you live.

Helps us identify the right home at this postcode.

Drag the pin onto your home or tap the map to move it. Blue outlines show building footprints where the map has them. Zoom in if outlines do not appear.

Roof snapshot

Illustrative only — not a site survey

This roof face

Updates when you change the roof face tab above.

Roof plan area
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Main roof face
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Roof tilt
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Suggested system size
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Panels for suggested size
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Whole property

Sunshine, yield, and layout limits apply to the building model for this address—not the single roof face above.

Model sunshine hours
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Indicative — the savings step uses the main estimate below.
Indicative annual yield (DC)
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Model & imagery notes
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Install Costs

Indicitive installation costs for the roof face selected above.

Estimated install cost
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Uses suggested system size.

Roof footprint and direction on the map are estimates. Tilt may default to a typical value when it cannot be detected. Suggested size uses ~165 W/m² and 72% usable roof area. Panel count assumes 1.9×1.0 m, 450 W modules, packed by footprint using the same usable roof %. All values are guides, not a measured survey.

Your system

Suggested system

System size (kWp)
4 kWp
Roof tilt (°)
30°
Main roof faces
South

These values were estimated from your map pin where available.

Typical equipment losses (14%) and light shading are used automatically so this step stays simple. For full control, installers can use the professional estimator.

14%

Range 10–18%. Add site shading below — not a measured survey.

Effective total loss: 14%

Capped at 30% for the calculator. Very heavy shade may reduce output more than this model shows.

Site shading (self-reported)

How much do trees, chimneys, or nearby buildings block the sky toward your panels?

Your electricity price

We use typical export and self-use figures for homes without a battery. Adjust your import price if it matches your bill.

Fine-tune export & usage

Export / SEG price and self-consumption use typical default values. Turn on the option above to edit them.

35%

Without a battery, many homes use roughly 30–50% of what they generate on site.

Your indicative estimate

Estimated annual savings

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Based on your import/export prices and self-consumption.

Estimated generation

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What we used in the model

  • System size: —
  • Roof tilt: —
  • Orientation: — (aspect angle —°)
  • Technical / equipment losses: —
  • Site shading (self-reported): —
  • Extra loss from shading: —
  • Total effective loss: —
  • Location used: —

Generation by month (modelled average)

Monthly generation (kWh) — long-run average for your settings.

Monthly breakdown is not available; the annual figure above is unchanged.

  • Self-use: — kWh/year Illustrative value vs import: —
  • Export: — kWh/year Illustrative SEG income: —
  • Illustrative value vs imports (self-use): —
  • Approx. CO₂ avoided (self-use): — kg/year

Important: This is not financial advice. Shading, roof condition, equipment, and how you use electricity will change real results. For a firm quote, book a survey.

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