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Solar panel cost in Somerset (BS27)

See realistic solar installation costs, savings and payback for BS27 (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
£972
What you save every year
Profit Over 25 Years
£14,544
After paying itself off, you're this much ahead

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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 979 kWh/kW — 34 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 979 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)
979 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: £810, 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 1958 kWh 783 kWh 1175 kWh £207 £117 £324 £3,256 10.0 yrs £3,227
3 kW 2937 kWh 1175 kWh 1762 kWh £310 £176 £486 £4,883 10.0 yrs £4,841
4 kW 3916 kWh 1566 kWh 2349 kWh £413 £235 £648 £6,511 10.0 yrs £6,455
5 kW 4895 kWh 1958 kWh 2937 kWh £517 £294 £810 £8,139 10.0 yrs £8,068
6 kW 5874 kWh 2349 kWh 3524 kWh £620 £352 £972 £9,767 10.0 yrs £9,682
7 kW 6853 kWh 2741 kWh 4112 kWh £723 £411 £1,135 £11,394 10.0 yrs £11,296
8 kW 7831 kWh 3133 kWh 4699 kWh £827 £470 £1,297 £13,022 10.0 yrs £12,909

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: £971, 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 1958 kWh 1175 kWh 783 kWh £310 £78 £388 £5,356 13.8 yrs £2,411
3 kW 2937 kWh 1762 kWh 1175 kWh £465 £117 £582 £6,983 12.0 yrs £4,666
4 kW 3916 kWh 2349 kWh 1566 kWh £620 £157 £777 £8,611 11.1 yrs £6,922
5 kW 4895 kWh 2937 kWh 1958 kWh £775 £196 £971 £10,239 10.5 yrs £9,177
6 kW 5874 kWh 3524 kWh 2349 kWh £930 £235 £1,165 £11,867 10.2 yrs £11,433
7 kW 6853 kWh 4112 kWh 2741 kWh £1,085 £274 £1,359 £13,494 9.9 yrs £13,688
8 kW 7831 kWh 4699 kWh 3133 kWh £1,240 £313 £1,553 £15,122 9.7 yrs £15,944

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: £1,051, Upfront: £11,639, Break-even: 11.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1958 kWh 1371 kWh 587 kWh £362 £59 £420 £6,756 16.1 yrs £1,653
3 kW 2937 kWh 2056 kWh 881 kWh £543 £88 £631 £8,383 13.3 yrs £4,229
4 kW 3916 kWh 2741 kWh 1175 kWh £723 £117 £841 £10,011 11.9 yrs £6,805
5 kW 4895 kWh 3426 kWh 1468 kWh £904 £147 £1,051 £11,639 11.1 yrs £9,382
6 kW 5874 kWh 4112 kWh 1762 kWh £1,085 £176 £1,261 £13,267 10.5 yrs £11,958
7 kW 6853 kWh 4797 kWh 2056 kWh £1,266 £206 £1,471 £14,894 10.1 yrs £14,534
8 kW 7831 kWh 5482 kWh 2349 kWh £1,447 £235 £1,682 £16,522 9.8 yrs £17,111

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: £1,075, Upfront: £13,389, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1958 kWh 1429 kWh 529 kWh £377 £53 £430 £8,506 19.8 yrs £95
3 kW 2937 kWh 2144 kWh 793 kWh £566 £79 £645 £10,133 15.7 yrs £2,768
4 kW 3916 kWh 2858 kWh 1057 kWh £754 £106 £860 £11,761 13.7 yrs £5,440
5 kW 4895 kWh 3573 kWh 1322 kWh £943 £132 £1,075 £13,389 12.5 yrs £8,113
6 kW 5874 kWh 4288 kWh 1586 kWh £1,132 £159 £1,290 £15,017 11.6 yrs £10,786
7 kW 6853 kWh 5002 kWh 1850 kWh £1,320 £185 £1,505 £16,644 11.1 yrs £13,458
8 kW 7831 kWh 5717 kWh 2114 kWh £1,509 £211 £1,720 £18,272 10.6 yrs £16,131

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: £1,091, Upfront: £15,139, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1958 kWh 1468 kWh 489 kWh £388 £49 £436 £10,256 23.5 yrs £-1,526
3 kW 2937 kWh 2203 kWh 734 kWh £581 £73 £655 £11,883 18.2 yrs £1,210
4 kW 3916 kWh 2937 kWh 979 kWh £775 £98 £873 £13,511 15.5 yrs £3,947
5 kW 4895 kWh 3671 kWh 1224 kWh £969 £122 £1,091 £15,139 13.9 yrs £6,684
6 kW 5874 kWh 4405 kWh 1468 kWh £1,163 £147 £1,309 £16,767 12.8 yrs £9,421
7 kW 6853 kWh 5139 kWh 1713 kWh £1,356 £171 £1,528 £18,394 12.0 yrs £12,158
8 kW 7831 kWh 5874 kWh 1958 kWh £1,550 £196 £1,746 £20,022 11.5 yrs £14,894

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: £1,107, Upfront: £17,589, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1958 kWh 1508 kWh 450 kWh £398 £45 £443 £12,706 28.7 yrs £-3,848
3 kW 2937 kWh 2261 kWh 675 kWh £597 £68 £664 £14,333 21.6 yrs £-1,047
4 kW 3916 kWh 3015 kWh 901 kWh £796 £90 £886 £15,961 18.0 yrs £1,754
5 kW 4895 kWh 3769 kWh 1126 kWh £995 £113 £1,107 £17,589 15.9 yrs £4,555
6 kW 5874 kWh 4523 kWh 1351 kWh £1,194 £135 £1,329 £19,217 14.5 yrs £7,356
7 kW 6853 kWh 5276 kWh 1576 kWh £1,392 £158 £1,550 £20,844 13.4 yrs £10,157
8 kW 7831 kWh 6030 kWh 1801 kWh £1,591 £180 £1,771 £22,472 12.7 yrs £12,958

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 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.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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Insights for BS27

Figures below are tailored to BS27 — click through for full league tables.

Big-Roof Britain Rank #753 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1041 of 2996
10.0 years (UK avg 10.8 years)
~£972 /yr • £9,767 upfront
Standing-Charge Drag Rank #822 of 2996
21.7% (UK avg 26.6%) drag on savings
£211 fixed • ~£972 /yr value
Aspect Penalty View ranking →
East −19.2% West −20.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BS27

Monthly generation per kilowatt of solar panels

kWh 37 Jan 51 Feb 86 Mar 114 Apr 122 May 118 Jun 120 Jul 104 Aug 90 Sep 63 Oct 43 Nov 31 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.8% 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 40 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 159 kWh in winter, or 326 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
979kWh/kW
A 1 kW system generates ~979 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

Houses: 68% • Flats: 15% • Bungalows: 15% Based on 2,182 properties

Coverage

Somerset (100%)

Areas Covered

Cheddar, Mendip West

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

BS26 (Somerset)
≈4.9 km away
Local sunshine: ~1,006 kWh/kWp · +3% vs BS27
BS25 (North Somerset)
≈6.0 km away
Local sunshine: ~978 kWh/kWp · -0% vs BS27
BS28 (Somerset)
≈6.0 km away
Local sunshine: ~1,012 kWh/kWp · +3% vs BS27
BS29 (North Somerset)
≈9.0 km away
Local sunshine: ~953 kWh/kWp · -3% vs BS27
BS40 (North Somerset)
≈10.5 km away
Local sunshine: ~998 kWh/kWp · +2% vs BS27
BA5 (Somerset)
≈11.4 km away
Local sunshine: ~988 kWh/kWp · +1% vs BS27

Similar sunshine across the UK

NG13 (Rushcliffe)
~979 kWh/kWp · +0% vs BS27
CV36 (Stratford-on-Avon)
~979 kWh/kWp · -0% vs BS27
LN8 (West Lindsey)
~979 kWh/kWp · -0% vs BS27