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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BS23 (North Somerset)

See if solar pays off for you in North 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
11.8 years
After this, it's pure profit
Upfront Cost
£6,104
What you pay to get started
Annual Benefit
£518
What you save every year
Profit Over 25 Years
£6,841
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 1032 kWh/kW — 18 above the regional median (1013).

Read the full story

A typical roof here lands around 3.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1032 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)
1032 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: £863, Upfront: £10,173, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 825 kWh 1238 kWh £221 £124 £345 £4,069 11.8 yrs £2,834
3 kW 3095 kWh 1238 kWh 1857 kWh £332 £186 £518 £6,104 11.8 yrs £4,252
4 kW 4127 kWh 1651 kWh 2476 kWh £443 £248 £690 £8,138 11.8 yrs £5,669
5 kW 5159 kWh 2063 kWh 3095 kWh £553 £310 £863 £10,173 11.8 yrs £7,086
6 kW 6190 kWh 2476 kWh 3714 kWh £664 £371 £1,036 £12,207 11.8 yrs £8,503
7 kW 7222 kWh 2889 kWh 4333 kWh £775 £433 £1,208 £14,242 11.8 yrs £9,921
8 kW 8254 kWh 3302 kWh 4952 kWh £885 £495 £1,381 £16,276 11.8 yrs £11,338

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: £1,036, Upfront: £12,273, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 1238 kWh 825 kWh £332 £83 £415 £6,169 14.9 yrs £2,123
3 kW 3095 kWh 1857 kWh 1238 kWh £498 £124 £622 £8,204 13.2 yrs £4,234
4 kW 4127 kWh 2476 kWh 1651 kWh £664 £165 £829 £10,238 12.3 yrs £6,346
5 kW 5159 kWh 3095 kWh 2063 kWh £830 £206 £1,036 £12,273 11.8 yrs £8,457
6 kW 6190 kWh 3714 kWh 2476 kWh £996 £248 £1,244 £14,307 11.5 yrs £10,568
7 kW 7222 kWh 4333 kWh 2889 kWh £1,162 £289 £1,451 £16,342 11.3 yrs £12,680
8 kW 8254 kWh 4952 kWh 3302 kWh £1,328 £330 £1,658 £18,376 11.1 yrs £14,791

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: £1,123, Upfront: £13,673, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 1444 kWh 619 kWh £387 £62 £449 £7,569 16.8 yrs £1,417
3 kW 3095 kWh 2167 kWh 929 kWh £581 £93 £674 £9,604 14.2 yrs £3,875
4 kW 4127 kWh 2889 kWh 1238 kWh £775 £124 £899 £11,638 13.0 yrs £6,334
5 kW 5159 kWh 3611 kWh 1548 kWh £968 £155 £1,123 £13,673 12.2 yrs £8,792
6 kW 6190 kWh 4333 kWh 1857 kWh £1,162 £186 £1,348 £15,707 11.7 yrs £11,251
7 kW 7222 kWh 5055 kWh 2167 kWh £1,356 £217 £1,573 £17,742 11.3 yrs £13,709
8 kW 8254 kWh 5778 kWh 2476 kWh £1,550 £248 £1,797 £19,776 11.0 yrs £16,168

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: £1,149, Upfront: £15,423, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 1506 kWh 557 kWh £404 £56 £460 £9,319 20.3 yrs £-125
3 kW 3095 kWh 2259 kWh 836 kWh £606 £84 £690 £11,354 16.5 yrs £2,438
4 kW 4127 kWh 3013 kWh 1114 kWh £808 £111 £919 £13,388 14.6 yrs £5,000
5 kW 5159 kWh 3766 kWh 1393 kWh £1,010 £139 £1,149 £15,423 13.4 yrs £7,563
6 kW 6190 kWh 4519 kWh 1671 kWh £1,212 £167 £1,379 £17,457 12.7 yrs £10,126
7 kW 7222 kWh 5272 kWh 1950 kWh £1,414 £195 £1,609 £19,492 12.1 yrs £12,688
8 kW 8254 kWh 6025 kWh 2229 kWh £1,616 £223 £1,839 £21,526 11.7 yrs £15,251

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: £1,167, Upfront: £17,173, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 1548 kWh 516 kWh £415 £52 £467 £11,069 23.7 yrs £-1,736
3 kW 3095 kWh 2321 kWh 774 kWh £623 £77 £700 £13,104 18.7 yrs £896
4 kW 4127 kWh 3095 kWh 1032 kWh £830 £103 £933 £15,138 16.2 yrs £3,528
5 kW 5159 kWh 3869 kWh 1290 kWh £1,038 £129 £1,167 £17,173 14.7 yrs £6,160
6 kW 6190 kWh 4643 kWh 1548 kWh £1,245 £155 £1,400 £19,207 13.7 yrs £8,792
7 kW 7222 kWh 5417 kWh 1806 kWh £1,453 £181 £1,633 £21,242 13.0 yrs £11,424
8 kW 8254 kWh 6190 kWh 2063 kWh £1,660 £206 £1,867 £23,276 12.5 yrs £14,056

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: £1,184, Upfront: £19,623, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2063 kWh 1589 kWh 475 kWh £426 £47 £474 £13,519 28.5 yrs £-4,047
3 kW 3095 kWh 2383 kWh 712 kWh £639 £71 £710 £15,554 21.9 yrs £-1,346
4 kW 4127 kWh 3178 kWh 949 kWh £852 £95 £947 £17,588 18.6 yrs £1,356
5 kW 5159 kWh 3972 kWh 1186 kWh £1,065 £119 £1,184 £19,623 16.6 yrs £4,057
6 kW 6190 kWh 4767 kWh 1424 kWh £1,278 £142 £1,421 £21,657 15.2 yrs £6,759
7 kW 7222 kWh 5561 kWh 1661 kWh £1,491 £166 £1,658 £23,692 14.3 yrs £9,460
8 kW 8254 kWh 6355 kWh 1898 kWh £1,705 £190 £1,894 £25,726 13.6 yrs £12,161

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 BS23

Figures below are tailored to BS23 — click through for full league tables.

Big-Roof Britain Rank #2072 of 2182
4.0 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #254 of 2997
10.2 years (UK avg 11.3 years)
~£993 /yr • £10,173 upfront
Standing-Charge Drag Rank #1372 of 2997
19.9% (UK avg 21.7%) drag on savings
£197 fixed • ~£993 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1032kWh/kW
A 1 kW system generates ~1032 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
3.0kW
For houses & bungalows in this area

⚠️ This area is predominantly flats. Many residents require freeholder approval for solar installations. System size shown reflects houses and bungalows only.

Local Property Data

Property Types

Houses: 33% • Flats: 62% • Bungalows: 4% Based on 13,799 properties

Coverage

North Somerset (100%)

Areas Covered

Weston-super-Mare South, Weston-super-Mare Central, Weston-super-Mare Hillside, Weston-super-Mare Uphill, Weston-super-Mare Milton, Weston-super-Mare Kewstoke, Weston-super-Mare Winterstoke, Gordano Valley + 1 more

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

BS0 (North Somerset)
≈0.9 km away
Local sunshine: ~1,032 kWh/kWp · -0% vs BS23
BS24 (North Somerset)
≈3.2 km away
Local sunshine: ~1,027 kWh/kWp · -0% vs BS23
BS22 (North Somerset)
≈3.6 km away
Local sunshine: ~1,029 kWh/kWp · -0% vs BS23
BS29 (North Somerset)
≈6.8 km away
Local sunshine: ~953 kWh/kWp · -8% vs BS23
BS25 (North Somerset)
≈10.2 km away
Local sunshine: ~978 kWh/kWp · -5% vs BS23
BS26 (Somerset)
≈10.7 km away
Local sunshine: ~1,006 kWh/kWp · -3% vs BS23

Similar sunshine across the UK

SO3 (Eastleigh)
~1,032 kWh/kWp · +0% vs BS23
SO32 (Winchester)
~1,032 kWh/kWp · +0% vs BS23
ME19 (Tonbridge and Malling)
~1,032 kWh/kWp · +0% vs BS23