Solar Panels Calculator

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Solar Panel Impact

Solar isn’t just about cheaper energy – it’s about predictable costs, low maintenance, and a stronger, more future‑proof home.

Lower energy bills

Generate your own clean electricity and rely less on your energy supplier, so more of your monthly bill stays in your pocket.

Lower energy bills

Many UK households see hundreds of pounds in annual savings once their system is set up and running.

Low maintenance, long life

Aside from occasional cleaning and a periodic health check, your system is built to deliver stable performance for decades, with no day‑to‑day hassle.

Low maintenance, long life

Modern solar panels are designed to work quietly in the background with very little input from you.

Stronger home appeal

A well‑installed solar system can make your property more attractive to future buyers who value lower bills and greener living.

Stronger home appeal

It shows that your home is energy‑conscious, future‑ready, and cheaper to run than similar properties without solar.

Why solar panels?

How solar panels turn daylight into usable energy

Solar panels might look simple from the outside, but inside they’re packed with smart technology that quietly converts daylight into clean, usable electricity for your home.

  • Sunlight hits the solar panels

    Sunlight is made up of tiny particles called photons. When these photons hit the solar cells inside your panels, they knock electrons loose from the silicon.

  • Electricity is generated inside the panel

    These freed electrons start to move, creating a flow of direct current (DC) electricity across the layers of each solar cell.

  • The inverter does the clever work

    The DC electricity travels from your panels to an inverter, which converts it into alternating current (AC) — the type of electricity your home appliances use every day.

  • Your home uses the solar power first

    The converted AC power is fed into your home’s electrical system, so your property automatically uses your solar energy before drawing from the grid.

  • Excess energy does not go to waste

    If your system produces more electricity than you’re using, the surplus can be exported back to the grid (or stored in a battery, if you have one), helping to reduce waste and improve your overall savings.

How much do solar panels cost?

Every home is different, but there are clear price bands for typical UK systems. The guide below shows example turnkey costs, including high‑efficiency panels, inverter, professional installation and projected first‑year savings for a range of system sizes.

System Size
Panels
Roof Area
Cost/watt
Total Cost
Savings
Payback
2 Kw
6-8
10-14 m^2
£1.8 - 2.2
£3.6 - 4.4k
£300 - 400
9-12y
3 Kw
8-10
14-18 m^2
£1.7 - 2.1
£5.1 - 6.3
£450 - 600
4 Kw
10-14
18-24 m^2
£600 - 850
7 - 10y
5 Kw
14-18
24-30 m^2
£1.5 - 1.9
28-36 m^2
Solar Savings Calculator – Simple Green Energy
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What type of property do you have?

This helps us understand the size of the property, so we can calculate accurate savings data.

How many bedrooms does your home have?

Bedroom count helps us estimate your typical energy consumption and the right solar panel system size.

Which direction does your roof primarily face?

South-facing roofs get the most sun in the UK. A south-facing roof can generate up to 30% more solar energy than a north-facing one.

Typically, when do you use electricity?

This helps us understand when you use your energy, allowing us to demonstrate if solar will be worthwhile for you.

What's your approximate annual electricity bill?

£1,200 /yr
≈ £100/month
£400£4,000
Your current bill helps us calculate exactly how much solar could save you each year. Check your latest statement or energy app.

Are you interested in battery storage?

A battery lets you use stored solar energy in the evenings — significantly increasing your self-consumption and savings.

Where in the UK is your property?

Your Estimated Annual Savings
£—
per year
Where your savings come from
Cumulative savings over 25 years
🌿

Environmental Impact

or
Estimates based on UK average data (Ofgem 2026 tariffs, PVGIS irradiance data, MCS cost benchmarks). Actual savings vary — get a professional survey for precise figures.

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Frequently Asked Questions

You could get up to £7,500 towards an air source or ground source heat pump. The grant is paid directly to your installer and should be deducted from your upfront cost, making your upgrade more affordable.

The process is designed to be installer-led, which means we’ll take care of the complete application and paperwork on your behalf making it as hassle-free as possible.

You must be replacing an old fossil fuel system such as gas, oil, LPG, or electric storage/panel heaters. The scheme does not cover upgrades from an existing heat pump or where there has already been similar government support.​

Yes. Your property must have a valid EPC (Energy Performance Certificate) with no outstanding loft or cavity wall insulation recommendations (unless exempt). We’ll help check this for you automatically.​

Most applications are processed in a few weeks, and installation can usually be completed within 4-6 weeks after approval, although timing may vary depending on demand