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Solar panel cost in North Somerset (BS20)

See realistic solar installation costs, savings and payback for BS20 (North 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
9.8 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£997
What you save every year
Profit Over 25 Years
£15,161
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 1004 kWh/kW — 10 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 1004 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)
1004 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: £831, Upfront: £8,139, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 803 kWh 1205 kWh £212 £120 £332 £3,256 9.8 yrs £3,392
3 kW 3011 kWh 1205 kWh 1807 kWh £318 £181 £499 £4,883 9.8 yrs £5,088
4 kW 4015 kWh 1606 kWh 2409 kWh £424 £241 £665 £6,511 9.8 yrs £6,784
5 kW 5019 kWh 2008 kWh 3011 kWh £530 £301 £831 £8,139 9.8 yrs £8,480
6 kW 6023 kWh 2409 kWh 3614 kWh £636 £361 £997 £9,767 9.8 yrs £10,176
7 kW 7026 kWh 2811 kWh 4216 kWh £742 £422 £1,163 £11,394 9.8 yrs £11,871
8 kW 8030 kWh 3212 kWh 4818 kWh £848 £482 £1,329 £13,022 9.8 yrs £13,567

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: £995, Upfront: £10,239, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 1205 kWh 803 kWh £318 £80 £398 £5,356 13.5 yrs £2,608
3 kW 3011 kWh 1807 kWh 1205 kWh £477 £120 £597 £6,983 11.7 yrs £4,962
4 kW 4015 kWh 2409 kWh 1606 kWh £636 £161 £796 £8,611 10.8 yrs £7,316
5 kW 5019 kWh 3011 kWh 2008 kWh £795 £201 £995 £10,239 10.3 yrs £9,670
6 kW 6023 kWh 3614 kWh 2409 kWh £954 £241 £1,195 £11,867 9.9 yrs £12,024
7 kW 7026 kWh 4216 kWh 2811 kWh £1,113 £281 £1,394 £13,494 9.7 yrs £14,378
8 kW 8030 kWh 4818 kWh 3212 kWh £1,271 £321 £1,593 £15,122 9.5 yrs £16,732

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: £1,078, Upfront: £11,639, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 1405 kWh 602 kWh £371 £60 £431 £6,756 15.7 yrs £1,866
3 kW 3011 kWh 2108 kWh 903 kWh £556 £90 £647 £8,383 13.0 yrs £4,549
4 kW 4015 kWh 2811 kWh 1205 kWh £742 £120 £862 £10,011 11.6 yrs £7,232
5 kW 5019 kWh 3513 kWh 1506 kWh £927 £151 £1,078 £11,639 10.8 yrs £9,915
6 kW 6023 kWh 4216 kWh 1807 kWh £1,113 £181 £1,293 £13,267 10.3 yrs £12,598
7 kW 7026 kWh 4918 kWh 2108 kWh £1,298 £211 £1,509 £14,894 9.9 yrs £15,281
8 kW 8030 kWh 5621 kWh 2409 kWh £1,483 £241 £1,724 £16,522 9.6 yrs £17,964

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: £1,102, Upfront: £13,389, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 1466 kWh 542 kWh £387 £54 £441 £8,506 19.3 yrs £313
3 kW 3011 kWh 2198 kWh 813 kWh £580 £81 £661 £10,133 15.3 yrs £3,095
4 kW 4015 kWh 2931 kWh 1084 kWh £773 £108 £882 £11,761 13.3 yrs £5,877
5 kW 5019 kWh 3664 kWh 1355 kWh £967 £136 £1,102 £13,389 12.1 yrs £8,659
6 kW 6023 kWh 4397 kWh 1626 kWh £1,160 £163 £1,323 £15,017 11.4 yrs £11,440
7 kW 7026 kWh 5129 kWh 1897 kWh £1,354 £190 £1,543 £16,644 10.8 yrs £14,222
8 kW 8030 kWh 5862 kWh 2168 kWh £1,547 £217 £1,764 £18,272 10.4 yrs £17,004

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: £1,119, Upfront: £15,139, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 1506 kWh 502 kWh £397 £50 £448 £10,256 22.9 yrs £-1,305
3 kW 3011 kWh 2258 kWh 753 kWh £596 £75 £671 £11,883 17.7 yrs £1,543
4 kW 4015 kWh 3011 kWh 1004 kWh £795 £100 £895 £13,511 15.1 yrs £4,390
5 kW 5019 kWh 3764 kWh 1255 kWh £993 £125 £1,119 £15,139 13.5 yrs £7,238
6 kW 6023 kWh 4517 kWh 1506 kWh £1,192 £151 £1,343 £16,767 12.5 yrs £10,085
7 kW 7026 kWh 5270 kWh 1757 kWh £1,391 £176 £1,566 £18,394 11.7 yrs £12,933
8 kW 8030 kWh 6023 kWh 2008 kWh £1,589 £201 £1,790 £20,022 11.2 yrs £15,780

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: £1,135, Upfront: £17,589, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2008 kWh 1546 kWh 462 kWh £408 £46 £454 £12,706 28.0 yrs £-3,623
3 kW 3011 kWh 2319 kWh 693 kWh £612 £69 £681 £14,333 21.0 yrs £-710
4 kW 4015 kWh 3092 kWh 923 kWh £816 £92 £908 £15,961 17.6 yrs £2,203
5 kW 5019 kWh 3865 kWh 1154 kWh £1,020 £115 £1,135 £17,589 15.5 yrs £5,117
6 kW 6023 kWh 4637 kWh 1385 kWh £1,224 £139 £1,362 £19,217 14.1 yrs £8,030
7 kW 7026 kWh 5410 kWh 1616 kWh £1,428 £162 £1,589 £20,844 13.1 yrs £10,943
8 kW 8030 kWh 6183 kWh 1847 kWh £1,632 £185 £1,816 £22,472 12.4 yrs £13,857

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 North 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

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Want a quote sanity check for BS20?

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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.

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Insights for BS20

Figures below are tailored to BS20 — click through for full league tables.

Big-Roof Britain Rank #883 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #581 of 2996
9.8 years (UK avg 10.8 years)
~£997 /yr • £9,767 upfront
Standing-Charge Drag Rank #736 of 2996
21.2% (UK avg 26.6%) drag on savings
£211 fixed • ~£997 /yr value
Aspect Penalty View ranking →
East −20.4% West −20.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BS20

Monthly generation per kilowatt of solar panels

kWh 38 Jan 53 Feb 87 Mar 114 Apr 124 May 120 Jun 123 Jul 108 Aug 93 Sep 67 Oct 44 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.6% 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 42 kWh per month; the average month produces around 84 kWh. So a typical 4 kW home system would generate roughly 166 kWh in winter, or 335 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
1004kWh/kW
A 1 kW system generates ~1004 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: 54% • Flats: 34% • Bungalows: 12% Based on 8,172 properties

Coverage

North Somerset (100%)

Areas Covered

Portishead North, Portishead West, Portishead South, Gordano Valley, Portishead East, Pill, Long Ashton

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

BS48 (North Somerset)
≈5.7 km away
Local sunshine: ~1,002 kWh/kWp · -0% vs BS20
BS11 (Bristol, City of)
≈6.5 km away
Local sunshine: ~1,003 kWh/kWp · -0% vs BS20
BS19 (North Somerset)
≈7.0 km away
Local sunshine: ~1,002 kWh/kWp · -0% vs BS20
BS21 (North Somerset)
≈7.8 km away
Local sunshine: ~1,006 kWh/kWp · +0% vs BS20
BS41 (North Somerset)
≈9.4 km away
Local sunshine: ~1,004 kWh/kWp · +0% vs BS20
BS9 (Bristol, City of)
≈10.3 km away
Local sunshine: ~996 kWh/kWp · -1% vs BS20

Similar sunshine across the UK

PE10 (South Kesteven)
~1,004 kWh/kWp · +0% vs BS20
PE99 (Peterborough)
~1,004 kWh/kWp · -0% vs BS20
CM23 (East Hertfordshire)
~1,004 kWh/kWp · -0% vs BS20