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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BS48 (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
12.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,006
What you save every year
Profit Over 25 Years
£12,938
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 1002 kWh/kW — 11 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 1002 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)
1002 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: £838, Upfront: £10,173, 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 2004 kWh 802 kWh 1203 kWh £215 £120 £335 £4,069 12.1 yrs £2,636
3 kW 3006 kWh 1203 kWh 1804 kWh £323 £180 £503 £6,104 12.1 yrs £3,955
4 kW 4008 kWh 1603 kWh 2405 kWh £430 £241 £671 £8,138 12.1 yrs £5,273
5 kW 5011 kWh 2004 kWh 3006 kWh £538 £301 £838 £10,173 12.1 yrs £6,591
6 kW 6013 kWh 2405 kWh 3608 kWh £645 £361 £1,006 £12,207 12.1 yrs £7,909
7 kW 7015 kWh 2806 kWh 4209 kWh £753 £421 £1,173 £14,242 12.1 yrs £9,227
8 kW 8017 kWh 3207 kWh 4810 kWh £860 £481 £1,341 £16,276 12.1 yrs £10,545

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: £1,007, Upfront: £12,273, 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 2004 kWh 1203 kWh 802 kWh £323 £80 £403 £6,169 15.3 yrs £1,885
3 kW 3006 kWh 1804 kWh 1203 kWh £484 £120 £604 £8,204 13.6 yrs £3,877
4 kW 4008 kWh 2405 kWh 1603 kWh £645 £160 £805 £10,238 12.7 yrs £5,870
5 kW 5011 kWh 3006 kWh 2004 kWh £806 £200 £1,007 £12,273 12.2 yrs £7,862
6 kW 6013 kWh 3608 kWh 2405 kWh £968 £241 £1,208 £14,307 11.8 yrs £9,854
7 kW 7015 kWh 4209 kWh 2806 kWh £1,129 £281 £1,409 £16,342 11.6 yrs £11,847
8 kW 8017 kWh 4810 kWh 3207 kWh £1,290 £321 £1,611 £18,376 11.4 yrs £13,839

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: £1,091, Upfront: £13,673, 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 2004 kWh 1403 kWh 601 kWh £376 £60 £436 £7,569 17.3 yrs £1,159
3 kW 3006 kWh 2104 kWh 902 kWh £564 £90 £655 £9,604 14.7 yrs £3,489
4 kW 4008 kWh 2806 kWh 1203 kWh £753 £120 £873 £11,638 13.3 yrs £5,818
5 kW 5011 kWh 3507 kWh 1503 kWh £941 £150 £1,091 £13,673 12.5 yrs £8,148
6 kW 6013 kWh 4209 kWh 1804 kWh £1,129 £180 £1,309 £15,707 12.0 yrs £10,477
7 kW 7015 kWh 4910 kWh 2104 kWh £1,317 £210 £1,527 £17,742 11.6 yrs £12,807
8 kW 8017 kWh 5612 kWh 2405 kWh £1,505 £241 £1,746 £19,776 11.3 yrs £15,136

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: £1,116, Upfront: £15,423, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1463 kWh 541 kWh £392 £54 £447 £9,319 20.9 yrs £-389
3 kW 3006 kWh 2195 kWh 812 kWh £589 £81 £670 £11,354 17.0 yrs £2,042
4 kW 4008 kWh 2926 kWh 1082 kWh £785 £108 £893 £13,388 15.0 yrs £4,473
5 kW 5011 kWh 3658 kWh 1353 kWh £981 £135 £1,116 £15,423 13.8 yrs £6,903
6 kW 6013 kWh 4389 kWh 1623 kWh £1,177 £162 £1,340 £17,457 13.0 yrs £9,334
7 kW 7015 kWh 5121 kWh 1894 kWh £1,373 £189 £1,563 £19,492 12.5 yrs £11,765
8 kW 8017 kWh 5852 kWh 2165 kWh £1,570 £216 £1,786 £21,526 12.1 yrs £14,195

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: £1,133, Upfront: £17,173, 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 2004 kWh 1503 kWh 501 kWh £403 £50 £453 £11,069 24.4 yrs £-2,004
3 kW 3006 kWh 2255 kWh 752 kWh £605 £75 £680 £13,104 19.3 yrs £494
4 kW 4008 kWh 3006 kWh 1002 kWh £806 £100 £907 £15,138 16.7 yrs £2,992
5 kW 5011 kWh 3758 kWh 1253 kWh £1,008 £125 £1,133 £17,173 15.2 yrs £5,490
6 kW 6013 kWh 4510 kWh 1503 kWh £1,209 £150 £1,360 £19,207 14.1 yrs £7,988
7 kW 7015 kWh 5261 kWh 1754 kWh £1,411 £175 £1,586 £21,242 13.4 yrs £10,487
8 kW 8017 kWh 6013 kWh 2004 kWh £1,613 £200 £1,813 £23,276 12.8 yrs £12,985

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: £1,150, Upfront: £19,623, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1543 kWh 461 kWh £414 £46 £460 £13,519 29.4 yrs £-4,319
3 kW 3006 kWh 2315 kWh 691 kWh £621 £69 £690 £15,554 22.5 yrs £-1,753
4 kW 4008 kWh 3087 kWh 922 kWh £828 £92 £920 £17,588 19.1 yrs £812
5 kW 5011 kWh 3858 kWh 1152 kWh £1,035 £115 £1,150 £19,623 17.1 yrs £3,378
6 kW 6013 kWh 4630 kWh 1383 kWh £1,242 £138 £1,380 £21,657 15.7 yrs £5,943
7 kW 7015 kWh 5401 kWh 1613 kWh £1,449 £161 £1,610 £23,692 14.7 yrs £8,509
8 kW 8017 kWh 6173 kWh 1844 kWh £1,656 £184 £1,840 £25,726 14.0 yrs £11,074

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 BS48

Figures below are tailored to BS48 — click through for full league tables.

Big-Roof Britain Rank #448 of 2182
5.7 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #477 of 2997
10.5 years (UK avg 11.3 years)
~£1,158 /yr • £12,207 upfront
Standing-Charge Drag Rank #716 of 2997
17.0% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,158 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1002kWh/kW
A 1 kW system generates ~1002 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: 69% • Flats: 15% • Bungalows: 15% Based on 6,015 properties

Coverage

North Somerset (100%)

Areas Covered

Nailsea Yeo, Backwell, Nailsea West End, Nailsea Golden Valley, Nailsea Youngwood, Long Ashton, Winford, Wrington

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

BS19 (North Somerset)
≈1.4 km away
Local sunshine: ~1,002 kWh/kWp · +0% vs BS48
BS20 (North Somerset)
≈5.7 km away
Local sunshine: ~1,004 kWh/kWp · +0% vs BS48
BS49 (North Somerset)
≈6.3 km away
Local sunshine: ~996 kWh/kWp · -1% vs BS48
BS41 (North Somerset)
≈6.6 km away
Local sunshine: ~1,004 kWh/kWp · +0% vs BS48
BS21 (North Somerset)
≈6.8 km away
Local sunshine: ~1,006 kWh/kWp · +0% vs BS48
BS11 (Bristol, City of)
≈9.4 km away
Local sunshine: ~1,003 kWh/kWp · +0% vs BS48

Similar sunshine across the UK

MK41 (Bedford)
~1,002 kWh/kWp · -0% vs BS48
NP10 (Newport)
~1,002 kWh/kWp · -0% vs BS48
SG11 (East Hertfordshire)
~1,002 kWh/kWp · +0% vs BS48