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Postcode solar briefing

Solar panel cost in Somerset (BA21)

See realistic solar installation costs, savings and payback for BA21 (Somerset) using official UK data. Start with the local verdict, then adjust the calculator for your roof, usage and export assumptions.

Local model Calculator unchanged Quote assumptions checked
Local solar briefing

Solar in BA21: roof size may be the main upside, so compare proposed system sizes carefully.

This is a modelled local view, not a promise of savings. Use it as a quick sense-check before comparing installer quotes for BA21.

Typical system
5.0 kW
starting point
Annual benefit
£845
before battery costs
Payback estimate
9.6 years
panel-only baseline
Postcode verdict
Roof-size upside
local model
Local context

Why BA21 differs

South-facing yield is close to the Southern median, so roof size, usage and tariff assumptions do most of the work.

The starting system size is close to the regional typical size at 5.0 kW.

Local housing mix looks suitable for a postcode-level estimate, but your actual roof still matters more than the area average.

Battery payback depends heavily on evening use, export tariff and whether the installer has assumed optimistic self-consumption.

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
9.6 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£845
What you save every year
Profit Over 25 Years
£12,991
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.

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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.

Before you sign

What to challenge in solar quotes for BA21

Use the calculator above as a baseline, then ask installers to explain where their quote differs from the local assumptions.

If the proposed system is much larger than 5.0 kW, ask why it fits your roof and usage.

Compare payback with and without a battery before accepting a bundled quote.

Check which Smart Export Guarantee tariff is assumed. The calculator baseline uses 10p/kWh.

Confirm who handles MCS certification and DNO/G98/G99 paperwork before comparing finance or warranties.

Compare quotes Check MCS DNO, G98 and G99
New quote check

Want a quote sanity check for BA21?

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 BA21

Figures below are tailored to BA21 — click through for full league tables.

Big-Roof Britain Rank #1483 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #342 of 2996
9.6 years (UK avg 10.8 years)
~£845 /yr • £8,139 upfront
Standing-Charge Drag Rank #772 of 2996
21.4% (UK avg 26.6%) drag on savings
£181 fixed • ~£845 /yr value
Aspect Penalty View ranking →
East −20.2% West −19.9%
Typical output loss versus a south-facing roof (lower is better)
Compare areas

Compare BA21 with nearby and similar areas

Nearby postcode areas in Southern

BA20 (Somerset)
≈1.2 km away
Local sunshine: ~1,020 kWh/kWp · -0% vs BA21
BA22 (Somerset)
≈1.9 km away
Local sunshine: ~1,009 kWh/kWp · -1% vs BA21
DT9 (Dorset)
≈8.0 km away
Local sunshine: ~1,017 kWh/kWp · -0% vs BA21
BA8 (Somerset)
≈16.2 km away
Local sunshine: ~1,020 kWh/kWp · -0% vs BA21
BA7 (Somerset)
≈17.4 km away
Local sunshine: ~1,007 kWh/kWp · -1% vs BA21
BA9 (Somerset)
≈19.4 km away
Local sunshine: ~1,012 kWh/kWp · -1% vs BA21

Similar solar-yield areas

TA13 (Somerset)
~1,020 kWh/kWp · -0% vs BA21
DA5 (Bexley)
~1,020 kWh/kWp · -0% vs BA21
EX1 (Exeter)
~1,020 kWh/kWp · -0% vs BA21

Your area in context

In Southern, the current unit rate is 26.42p/kWh with a 49.70p/day standing charge. Your postcode’s south-facing sunshine yield is 1020 kWh/kW — 19 above the regional median (1001).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1020 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
49.7p/day
Sunshine yield (south)
1020 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: £845, Upfront: £8,139, Break-even: 9.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 816 kWh 1224 kWh £216 £122 £338 £3,256 9.6 yrs £3,506
3 kW 3061 kWh 1224 kWh 1837 kWh £323 £184 £507 £4,883 9.6 yrs £5,259
4 kW 4081 kWh 1632 kWh 2449 kWh £431 £245 £676 £6,511 9.6 yrs £7,012
5 kW 5101 kWh 2041 kWh 3061 kWh £539 £306 £845 £8,139 9.6 yrs £8,765
6 kW 6122 kWh 2449 kWh 3673 kWh £647 £367 £1,014 £9,767 9.6 yrs £10,518
7 kW 7142 kWh 2857 kWh 4285 kWh £755 £429 £1,183 £11,394 9.6 yrs £12,271
8 kW 8162 kWh 3265 kWh 4897 kWh £863 £490 £1,352 £13,022 9.6 yrs £14,024

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: £1,013, Upfront: £10,239, Break-even: 10.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 1224 kWh 816 kWh £323 £82 £405 £5,356 13.2 yrs £2,746
3 kW 3061 kWh 1837 kWh 1224 kWh £485 £122 £608 £6,983 11.5 yrs £5,169
4 kW 4081 kWh 2449 kWh 1632 kWh £647 £163 £810 £8,611 10.6 yrs £7,593
5 kW 5101 kWh 3061 kWh 2041 kWh £809 £204 £1,013 £10,239 10.1 yrs £10,016
6 kW 6122 kWh 3673 kWh 2449 kWh £970 £245 £1,215 £11,867 9.8 yrs £12,439
7 kW 7142 kWh 4285 kWh 2857 kWh £1,132 £286 £1,418 £13,494 9.5 yrs £14,862
8 kW 8162 kWh 4897 kWh 3265 kWh £1,294 £326 £1,620 £15,122 9.3 yrs £17,285

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: £1,096, Upfront: £11,639, Break-even: 10.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 1428 kWh 612 kWh £377 £61 £439 £6,756 15.4 yrs £2,016
3 kW 3061 kWh 2143 kWh 918 kWh £566 £92 £658 £8,383 12.7 yrs £4,775
4 kW 4081 kWh 2857 kWh 1224 kWh £755 £122 £877 £10,011 11.4 yrs £7,533
5 kW 5101 kWh 3571 kWh 1530 kWh £943 £153 £1,096 £11,639 10.6 yrs £10,291
6 kW 6122 kWh 4285 kWh 1837 kWh £1,132 £184 £1,316 £13,267 10.1 yrs £13,049
7 kW 7142 kWh 4999 kWh 2143 kWh £1,321 £214 £1,535 £14,894 9.7 yrs £15,808
8 kW 8162 kWh 5714 kWh 2449 kWh £1,510 £245 £1,754 £16,522 9.4 yrs £18,566

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: £1,122, Upfront: £13,389, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 1490 kWh 551 kWh £394 £55 £449 £8,506 19.0 yrs £467
3 kW 3061 kWh 2234 kWh 826 kWh £590 £83 £673 £10,133 15.1 yrs £3,326
4 kW 4081 kWh 2979 kWh 1102 kWh £787 £110 £897 £11,761 13.1 yrs £6,185
5 kW 5101 kWh 3724 kWh 1377 kWh £984 £138 £1,122 £13,389 11.9 yrs £9,044
6 kW 6122 kWh 4469 kWh 1653 kWh £1,181 £165 £1,346 £15,017 11.2 yrs £11,902
7 kW 7142 kWh 5214 kWh 1928 kWh £1,377 £193 £1,570 £16,644 10.6 yrs £14,761
8 kW 8162 kWh 5958 kWh 2204 kWh £1,574 £220 £1,795 £18,272 10.2 yrs £17,620

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: £1,138, Upfront: £15,139, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 1530 kWh 510 kWh £404 £51 £455 £10,256 22.5 yrs £-1,149
3 kW 3061 kWh 2296 kWh 765 kWh £607 £77 £683 £11,883 17.4 yrs £1,777
4 kW 4081 kWh 3061 kWh 1020 kWh £809 £102 £911 £13,511 14.8 yrs £4,703
5 kW 5101 kWh 3826 kWh 1275 kWh £1,011 £128 £1,138 £15,139 13.3 yrs £7,629
6 kW 6122 kWh 4591 kWh 1530 kWh £1,213 £153 £1,366 £16,767 12.3 yrs £10,554
7 kW 7142 kWh 5356 kWh 1785 kWh £1,415 £179 £1,594 £18,394 11.5 yrs £13,480
8 kW 8162 kWh 6122 kWh 2041 kWh £1,617 £204 £1,821 £20,022 11.0 yrs £16,406

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: £1,155, Upfront: £17,589, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2041 kWh 1571 kWh 469 kWh £415 £47 £462 £12,706 27.5 yrs £-3,464
3 kW 3061 kWh 2357 kWh 704 kWh £623 £70 £693 £14,333 20.7 yrs £-472
4 kW 4081 kWh 3142 kWh 939 kWh £830 £94 £924 £15,961 17.3 yrs £2,521
5 kW 5101 kWh 3928 kWh 1173 kWh £1,038 £117 £1,155 £17,589 15.2 yrs £5,514
6 kW 6122 kWh 4714 kWh 1408 kWh £1,245 £141 £1,386 £19,217 13.9 yrs £8,507
7 kW 7142 kWh 5499 kWh 1643 kWh £1,453 £164 £1,617 £20,844 12.9 yrs £11,499
8 kW 8162 kWh 6285 kWh 1877 kWh £1,660 £188 £1,848 £22,472 12.2 yrs £14,492

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.

Seasonal solar output in BA21

Monthly generation per kilowatt of solar panels

kWh 40 Jan 55 Feb 89 Mar 116 Apr 124 May 122 Jun 123 Jul 111 Aug 94 Sep 66 Oct 46 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.7% 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 43 kWh per month; the average month produces around 85 kWh. So a typical 4 kW home system would generate roughly 172 kWh in winter, or 340 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1020kWh/kW
A 1 kW system generates ~1020 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 68% • Flats: 21% • Bungalows: 11% Based on 9,980 properties

Coverage

Somerset (99%)|Dorset (1%)

Areas Covered

Yeovil East, Yeovil Central, Yeovil West, Brympton, Yeovil South, Castle Cary, Sherborne Rural

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.