Transparent solar output model

Estimate annual solar yield—then inspect every assumption.

Model system size, region, orientation, shade and self-use. The estimate is indicative and designed to be challenged.

Model a system Get installer quotes

Read our independence statement

kWp Array capacity

kWh Annual energy

% Self-use share

FACTS / ASSUMPTIONS / QUESTIONS

INTERACTIVE / BROWSER ONLY

Solar yield calculator

Uses a simplified kWp × regional factor × orientation × shade model. A professional design should use site-specific data.

READY WHEN YOU ARE

Your result will appear here.

Change any input and run the check. Nothing leaves this page.

No submission · no cookies · no storage · no analytics

GUIDE / KNOWLEDGE MAP

Move from first question to informed decision.

Short guides are organised around the decisions that most often get blurred together.

Run an estimate

Change the important variables and see annual generation and indicative bill value.

Understand the factors

Why location, orientation, inclination and shading change the result.

Interpret the result

Separate generation, self-use, export and financial assumptions.

Compare scenarios

Test conservative, central and higher cases rather than betting on one forecast.

Audit the method

See the simplified formula, exclusions and link to the formal MCS standard.

Keep data private

Everything calculates locally with no account, tracking or saved inputs.

PROCESS / THREE PASSES

A calmer way to make the decision.

The tool is a starting point. Written evidence and qualified confirmation finish the job.

01
Set

Enter system and site assumptions without personal information.
02
Stress-test

Change orientation, shade, self-use and tariffs.
03
Verify

Compare with an installer’s documented site-specific calculation.