Independent solar numbers for your postcode using official UK data
Home Regions Guides Compare quotes Solar assistant
Insights
Big Roof Britain Solar Payback Index Standing Charge Drag Roof Direction Penalty Winter Solar Reality Seasonal Solar Output

Solar panel cost in Bath and North East Somerset (BS18)

See realistic solar installation costs, savings and payback for BS18 (Bath and North East Somerset) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
10.0 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£979
What you save every year
Profit Over 25 Years
£14,697
After paying itself off, you're this much ahead

Ready to Get Started?

Get your free quote from Blue Ape Renewables. They'll connect you with MCS-certified installers in your area and handle all the paperwork.

Get Solar Quote →
4.8★ Trustpilot • Octopus Energy trusted partner • MCS certified • No obligation
How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In Southern Western, the current unit rate is 26.39p/kWh with a 57.89p/day standing charge. Your postcode’s south-facing sunshine yield is 985 kWh/kW — 28 below the regional median (1013).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 985 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
57.9p/day
Sunshine yield (south)
985 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £815, Upfront: £8,139, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 788 kWh 1182 kWh £208 £118 £326 £3,256 10.0 yrs £3,268
3 kW 2955 kWh 1182 kWh 1773 kWh £312 £177 £489 £4,883 10.0 yrs £4,902
4 kW 3940 kWh 1576 kWh 2364 kWh £416 £236 £652 £6,511 10.0 yrs £6,536
5 kW 4925 kWh 1970 kWh 2955 kWh £520 £296 £815 £8,139 10.0 yrs £8,170
6 kW 5910 kWh 2364 kWh 3546 kWh £624 £355 £979 £9,767 10.0 yrs £9,804
7 kW 6896 kWh 2758 kWh 4137 kWh £728 £414 £1,142 £11,394 10.0 yrs £11,438
8 kW 7881 kWh 3152 kWh 4728 kWh £832 £473 £1,305 £13,022 10.0 yrs £13,072

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £977, Upfront: £10,239, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 1182 kWh 788 kWh £312 £79 £391 £5,356 13.7 yrs £2,460
3 kW 2955 kWh 1773 kWh 1182 kWh £468 £118 £586 £6,983 11.9 yrs £4,740
4 kW 3940 kWh 2364 kWh 1576 kWh £624 £158 £782 £8,611 11.0 yrs £7,019
5 kW 4925 kWh 2955 kWh 1970 kWh £780 £197 £977 £10,239 10.5 yrs £9,299
6 kW 5910 kWh 3546 kWh 2364 kWh £936 £236 £1,172 £11,867 10.1 yrs £11,579
7 kW 6896 kWh 4137 kWh 2758 kWh £1,092 £276 £1,368 £13,494 9.9 yrs £13,859
8 kW 7881 kWh 4728 kWh 3152 kWh £1,248 £315 £1,563 £15,122 9.7 yrs £16,139

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,058, Upfront: £11,639, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 1379 kWh 591 kWh £364 £59 £423 £6,756 16.0 yrs £1,706
3 kW 2955 kWh 2069 kWh 887 kWh £546 £89 £635 £8,383 13.2 yrs £4,308
4 kW 3940 kWh 2758 kWh 1182 kWh £728 £118 £846 £10,011 11.8 yrs £6,911
5 kW 4925 kWh 3448 kWh 1478 kWh £910 £148 £1,058 £11,639 11.0 yrs £9,514
6 kW 5910 kWh 4137 kWh 1773 kWh £1,092 £177 £1,269 £13,267 10.5 yrs £12,117
7 kW 6896 kWh 4827 kWh 2069 kWh £1,274 £207 £1,481 £14,894 10.1 yrs £14,719
8 kW 7881 kWh 5516 kWh 2364 kWh £1,456 £236 £1,692 £16,522 9.8 yrs £17,322

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,082, Upfront: £13,389, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 1438 kWh 532 kWh £380 £53 £433 £8,506 19.7 yrs £149
3 kW 2955 kWh 2157 kWh 798 kWh £569 £80 £649 £10,133 15.6 yrs £2,849
4 kW 3940 kWh 2876 kWh 1064 kWh £759 £106 £865 £11,761 13.6 yrs £5,549
5 kW 4925 kWh 3596 kWh 1330 kWh £949 £133 £1,082 £13,389 12.4 yrs £8,248
6 kW 5910 kWh 4315 kWh 1596 kWh £1,139 £160 £1,298 £15,017 11.6 yrs £10,948
7 kW 6896 kWh 5034 kWh 1862 kWh £1,328 £186 £1,515 £16,644 11.0 yrs £13,647
8 kW 7881 kWh 5753 kWh 2128 kWh £1,518 £213 £1,731 £18,272 10.6 yrs £16,347

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,098, Upfront: £15,139, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 1478 kWh 493 kWh £390 £49 £439 £10,256 23.4 yrs £-1,472
3 kW 2955 kWh 2216 kWh 739 kWh £585 £74 £659 £11,883 18.0 yrs £1,293
4 kW 3940 kWh 2955 kWh 985 kWh £780 £99 £878 £13,511 15.4 yrs £4,057
5 kW 4925 kWh 3694 kWh 1231 kWh £975 £123 £1,098 £15,139 13.8 yrs £6,821
6 kW 5910 kWh 4433 kWh 1478 kWh £1,170 £148 £1,318 £16,767 12.7 yrs £9,585
7 kW 6896 kWh 5172 kWh 1724 kWh £1,365 £172 £1,537 £18,394 12.0 yrs £12,350
8 kW 7881 kWh 5910 kWh 1970 kWh £1,560 £197 £1,757 £20,022 11.4 yrs £15,114

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,114, Upfront: £17,589, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1970 kWh 1517 kWh 453 kWh £400 £45 £446 £12,706 28.5 yrs £-3,792
3 kW 2955 kWh 2276 kWh 680 kWh £601 £68 £668 £14,333 21.4 yrs £-964
4 kW 3940 kWh 3034 kWh 906 kWh £801 £91 £891 £15,961 17.9 yrs £1,865
5 kW 4925 kWh 3793 kWh 1133 kWh £1,001 £113 £1,114 £17,589 15.8 yrs £4,694
6 kW 5910 kWh 4551 kWh 1359 kWh £1,201 £136 £1,337 £19,217 14.4 yrs £7,523
7 kW 6896 kWh 5310 kWh 1586 kWh £1,401 £159 £1,560 £20,844 13.4 yrs £10,352
8 kW 7881 kWh 6068 kWh 1813 kWh £1,601 £181 £1,783 £22,472 12.6 yrs £13,180

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Before you request quotes in Bath and North East Somerset

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

Compare solar quotes before you sign

Check what MCS certification means

Understand DNO, G98 and G99 export limits

New quote check

Want a quote sanity check for BS18?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

Request a quote sanity check →

Insights for BS18

Figures below are tailored to BS18 — click through for full league tables.

Solar Payback Index Rank #1039 of 2996
10.0 years (UK avg 10.8 years)
~£978 /yr • £9,767 upfront
Standing-Charge Drag Rank #806 of 2996
21.6% (UK avg 26.6%) drag on savings
£211 fixed • ~£978 /yr value
Aspect Penalty View ranking →
East −20.0% West −19.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BS18

Monthly generation per kilowatt of solar panels

kWh 37 Jan 52 Feb 85 Mar 112 Apr 121 May 118 Jun 121 Jul 106 Aug 92 Sep 65 Oct 43 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.5% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 41 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 163 kWh in winter, or 328 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
985kWh/kW
A 1 kW system generates ~985 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

Bath and North East Somerset (70%)|North Somerset (28%)|Somerset (1%)

Areas Covered

Chew Valley, Keynsham East, Saltford, Blagdon & Churchill, Winford, Keynsham North, Keynsham South, Wrington + 4 more

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in Southern Western

BS39 (Bath and North East Somerset)
≈5.0 km away
Local sunshine: ~989 kWh/kWp · +0% vs BS18
BS14 (Bristol, City of)
≈5.2 km away
Local sunshine: ~994 kWh/kWp · +1% vs BS18
BS31 (Bath and North East Somerset)
≈5.8 km away
Local sunshine: ~985 kWh/kWp · +0% vs BS18
BS13 (Bristol, City of)
≈6.5 km away
Local sunshine: ~998 kWh/kWp · +1% vs BS18
BS4 (Bristol, City of)
≈7.8 km away
Local sunshine: ~994 kWh/kWp · +1% vs BS18
BS77 (Bristol, City of)
≈8.8 km away
Local sunshine: ~999 kWh/kWp · +1% vs BS18

Similar sunshine across the UK

GL13 (Stroud)
~985 kWh/kWp · +0% vs BS18
NW7 (Barnet)
~985 kWh/kWp · +0% vs BS18
LN3 (West Lindsey)
~985 kWh/kWp · -0% vs BS18