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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in TA10 (Somerset)

See if solar pays off for you in Somerset — price, savings and payback in under a minute (official UK data).

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
12.0 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,021
What you save every year
Profit Over 25 Years
£13,315
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: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • 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

Costs: Battery prices are typically £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 26.82p/kWh with a 54.03p/day standing charge. Your postcode’s south-facing sunshine yield is 1017 kWh/kW — 4 above 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 1017 kWh per year on a south-facing roof. We value self-used electricity at 26.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.8p/kWh
Standing charge
54.0p/day
Sunshine yield (south)
1017 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: £851, Upfront: £10,173, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 814 kWh 1221 kWh £218 £122 £340 £4,069 12.0 yrs £2,737
3 kW 3051 kWh 1221 kWh 1831 kWh £327 £183 £510 £6,104 12.0 yrs £4,105
4 kW 4069 kWh 1627 kWh 2441 kWh £436 £244 £681 £8,138 12.0 yrs £5,474
5 kW 5086 kWh 2034 kWh 3051 kWh £546 £305 £851 £10,173 12.0 yrs £6,842
6 kW 6103 kWh 2441 kWh 3662 kWh £655 £366 £1,021 £12,207 12.0 yrs £8,211
7 kW 7120 kWh 2848 kWh 4272 kWh £764 £427 £1,191 £14,242 12.0 yrs £9,579
8 kW 8137 kWh 3255 kWh 4882 kWh £873 £488 £1,361 £16,276 12.0 yrs £10,948

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,022, Upfront: £12,273, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 1221 kWh 814 kWh £327 £81 £409 £6,169 15.1 yrs £2,006
3 kW 3051 kWh 1831 kWh 1221 kWh £491 £122 £613 £8,204 13.4 yrs £4,058
4 kW 4069 kWh 2441 kWh 1627 kWh £655 £163 £817 £10,238 12.5 yrs £6,111
5 kW 5086 kWh 3051 kWh 2034 kWh £818 £203 £1,022 £12,273 12.0 yrs £8,164
6 kW 6103 kWh 3662 kWh 2441 kWh £982 £244 £1,226 £14,307 11.7 yrs £10,217
7 kW 7120 kWh 4272 kWh 2848 kWh £1,146 £285 £1,431 £16,342 11.4 yrs £12,270
8 kW 8137 kWh 4882 kWh 3255 kWh £1,309 £325 £1,635 £18,376 11.2 yrs £14,322

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,107, Upfront: £13,673, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 1424 kWh 610 kWh £382 £61 £443 £7,569 17.1 yrs £1,290
3 kW 3051 kWh 2136 kWh 915 kWh £573 £92 £664 £9,604 14.5 yrs £3,685
4 kW 4069 kWh 2848 kWh 1221 kWh £764 £122 £886 £11,638 13.1 yrs £6,080
5 kW 5086 kWh 3560 kWh 1526 kWh £955 £153 £1,107 £13,673 12.3 yrs £8,475
6 kW 6103 kWh 4272 kWh 1831 kWh £1,146 £183 £1,329 £15,707 11.8 yrs £10,870
7 kW 7120 kWh 4984 kWh 2136 kWh £1,337 £214 £1,550 £17,742 11.4 yrs £13,265
8 kW 8137 kWh 5696 kWh 2441 kWh £1,528 £244 £1,772 £19,776 11.2 yrs £15,660

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,133, Upfront: £15,423, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 1485 kWh 549 kWh £398 £55 £453 £9,319 20.6 yrs £-255
3 kW 3051 kWh 2228 kWh 824 kWh £597 £82 £680 £11,354 16.7 yrs £2,243
4 kW 4069 kWh 2970 kWh 1099 kWh £797 £110 £906 £13,388 14.8 yrs £4,741
5 kW 5086 kWh 3713 kWh 1373 kWh £996 £137 £1,133 £15,423 13.6 yrs £7,238
6 kW 6103 kWh 4455 kWh 1648 kWh £1,195 £165 £1,360 £17,457 12.8 yrs £9,736
7 kW 7120 kWh 5198 kWh 1922 kWh £1,394 £192 £1,586 £19,492 12.3 yrs £12,233
8 kW 8137 kWh 5940 kWh 2197 kWh £1,593 £220 £1,813 £21,526 11.9 yrs £14,731

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,150, Upfront: £17,173, Break-even: 14.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 1526 kWh 509 kWh £409 £51 £460 £11,069 24.1 yrs £-1,868
3 kW 3051 kWh 2289 kWh 763 kWh £614 £76 £690 £13,104 19.0 yrs £698
4 kW 4069 kWh 3051 kWh 1017 kWh £818 £102 £920 £15,138 16.5 yrs £3,264
5 kW 5086 kWh 3814 kWh 1271 kWh £1,023 £127 £1,150 £17,173 14.9 yrs £5,830
6 kW 6103 kWh 4577 kWh 1526 kWh £1,228 £153 £1,380 £19,207 13.9 yrs £8,396
7 kW 7120 kWh 5340 kWh 1780 kWh £1,432 £178 £1,610 £21,242 13.2 yrs £10,962
8 kW 8137 kWh 6103 kWh 2034 kWh £1,637 £203 £1,840 £23,276 12.6 yrs £13,528

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,167, Upfront: £19,623, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2034 kWh 1566 kWh 468 kWh £420 £47 £467 £13,519 29.0 yrs £-4,181
3 kW 3051 kWh 2350 kWh 702 kWh £630 £70 £700 £15,554 22.2 yrs £-1,547
4 kW 4069 kWh 3133 kWh 936 kWh £840 £94 £934 £17,588 18.8 yrs £1,088
5 kW 5086 kWh 3916 kWh 1170 kWh £1,050 £117 £1,167 £19,623 16.8 yrs £3,722
6 kW 6103 kWh 4699 kWh 1404 kWh £1,260 £140 £1,401 £21,657 15.5 yrs £6,357
7 kW 7120 kWh 5482 kWh 1638 kWh £1,470 £164 £1,634 £23,692 14.5 yrs £8,991
8 kW 8137 kWh 6266 kWh 1872 kWh £1,680 £187 £1,868 £25,726 13.8 yrs £11,626

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, 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.

Insights for TA10

Figures below are tailored to TA10 — click through for full league tables.

Big-Roof Britain Rank #323 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #445 of 2997
10.4 years (UK avg 11.3 years)
~£1,175 /yr • £12,207 upfront
Standing-Charge Drag Rank #685 of 2997
16.8% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,175 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1017kWh/kW
A 1 kW system generates ~1017 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: 72% • Flats: 9% • Bungalows: 19% Based on 2,669 properties

Coverage

Somerset (100%)

Areas Covered

Curry Rivel & Langport, Somerton, South Petherton & Islemoor, Martock

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q4 2025

Installation costs: MCS certified installer data, March 2025

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

TA11 (Somerset)
≈7.1 km away
Local sunshine: ~1,014 kWh/kWp · -0% vs TA10
TA12 (Somerset)
≈8.0 km away
Local sunshine: ~1,017 kWh/kWp · +0% vs TA10
TA13 (Somerset)
≈9.7 km away
Local sunshine: ~1,020 kWh/kWp · +0% vs TA10
TA14 (Somerset)
≈10.6 km away
Local sunshine: ~1,018 kWh/kWp · +0% vs TA10
BA16 (Somerset)
≈11.5 km away
Local sunshine: ~1,009 kWh/kWp · -1% vs TA10
TA15 (Somerset)
≈12.1 km away
Local sunshine: ~1,018 kWh/kWp · +0% vs TA10

Similar sunshine across the UK

ME99 (Maidstone)
~1,017 kWh/kWp · -0% vs TA10
IP22 (South Norfolk)
~1,017 kWh/kWp · -0% vs TA10
CF36 (Bridgend)
~1,017 kWh/kWp · +0% vs TA10