Free Tools

Solar Panel Calculator UK

Find your home on the map, rotate the panel grid to match your roof, and place solar panels — panel by panel.

🛰️

Step 1 — Find your property

Enter your address or postcode to load a satellite view of your roof.

Enter your home address or postcode to get started.

Your address is only used to show your roof on the map — we don't store it.

☀️

Step 2 — Rotate to match your roof, then place panels

Drag the angle slider until it matches your roof's ridge line in the satellite view, then click to place panels — they'll already sit at the right angle.

Set your roof angle below, then click on your roof to place panels — each square = one 400W panel
Solar panel placed
Available grid cell
Rotate to match your roof
0°

Drag until the preview panel lines up with your roof's ridge in the satellite view — new panels you place will use this angle.

Roof direction (for sun exposure)
Panels placed
0
click roof to add
System size
0 kWp
400W panels
Annual generation
0 kWh
per year
Annual saving
£0
on your bills
Estimated install cost
£0
fully installed
Start clicking your roof to place panels. Most UK homes need 8–16 panels.

Each panel is 400W. Annual generation based on your location's average sun hours. Electricity savings at 26.1p/kWh, SEG export at 15p/kWh. Install cost estimate based on current UK market rates — actual quotes may vary. This tool provides estimates only and is not a quote.

📅 Rates last verified: August 2026 · Electricity 26.1p/kWh · SEG 15p/kWh

Want a detailed financial breakdown?

Use our savings calculator below to factor in battery storage, EVs and 25-year returns.

🧮

Detailed savings calculator

Enter your details for a full financial breakdown including postcode-adjusted generation, 25-year returns and monthly savings chart.

📍 Your location Enter your postcode to adjust generation for your region — solar yield varies by up to 30% across the UK.
🏠 Your roof direction Which direction does your main roof face?
⚡ System size Most 3-bed homes suit 4 kWp.
💡 Monthly electricity bill Drag to match your average monthly spend.
£40 £400 £120/mo
📊 Your electricity tariff Smart tariffs significantly change how much you save.
🏷️ Current EPC rating Solar panels can push your EPC up — which adds property value.
🔧 Your setup
🔋 Battery storage system Stores unused solar for evenings
Battery size:
🚗 Electric vehicle (EV) Charge from surplus solar during the day
☀️ SEG export tariff Earn money for electricity exported to grid

Your estimated savings

Annual generation
3,800 kWh
units per year
Annual savings
£680
on your bills
Payback period
9.5 yrs
typical 4kWp
25-year return
£11,500
after install cost
Bill covered
47%
of your electricity

Where your savings come from

Self-use
£408
SEG export
£136

Monthly generation through the year

Get Free Solar Panel Quotes

Compare quotes from MCS-certified local installers based on the system size you've just modelled — free, no obligation.

✅ Free · ✅ No obligation · ✅ MCS certified installers only