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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BS80 (South Gloucestershire)

See if solar pays off for you in South Gloucestershire — 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
£12,207
What you pay to get started
Annual Benefit
£1,035
What you save every year
Profit Over 25 Years
£13,680
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 6.0 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 £4,251
4 kW 4127 kWh 1651 kWh 2476 kWh £443 £248 £690 £8,138 11.8 yrs £5,668
5 kW 5158 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 £1,035 £12,207 11.8 yrs £8,503
7 kW 7222 kWh 2889 kWh 4333 kWh £775 £433 £1,208 £14,242 11.8 yrs £9,920
8 kW 8254 kWh 3301 kWh 4952 kWh £885 £495 £1,381 £16,276 11.8 yrs £11,337

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 £2,122
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 £6,345
5 kW 5158 kWh 3095 kWh 2063 kWh £830 £206 £1,036 £12,273 11.8 yrs £8,456
6 kW 6190 kWh 3714 kWh 2476 kWh £996 £248 £1,244 £14,307 11.5 yrs £10,567
7 kW 7222 kWh 4333 kWh 2889 kWh £1,162 £289 £1,451 £16,342 11.3 yrs £12,679
8 kW 8254 kWh 4952 kWh 3301 kWh £1,328 £330 £1,658 £18,376 11.1 yrs £14,790

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 14.3 yrs £3,875
4 kW 4127 kWh 2889 kWh 1238 kWh £775 £124 £899 £11,638 13.0 yrs £6,333
5 kW 5158 kWh 3611 kWh 1548 kWh £968 £155 £1,123 £13,673 12.2 yrs £8,791
6 kW 6190 kWh 4333 kWh 1857 kWh £1,162 £186 £1,348 £15,707 11.7 yrs £11,250
7 kW 7222 kWh 5055 kWh 2167 kWh £1,356 £217 £1,572 £17,742 11.3 yrs £13,708
8 kW 8254 kWh 5777 kWh 2476 kWh £1,550 £248 £1,797 £19,776 11.0 yrs £16,166

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 £2,437
4 kW 4127 kWh 3013 kWh 1114 kWh £808 £111 £919 £13,388 14.6 yrs £5,000
5 kW 5158 kWh 3766 kWh 1393 kWh £1,010 £139 £1,149 £15,423 13.4 yrs £7,562
6 kW 6190 kWh 4519 kWh 1671 kWh £1,212 £167 £1,379 £17,457 12.7 yrs £10,124
7 kW 7222 kWh 5272 kWh 1950 kWh £1,414 £195 £1,609 £19,492 12.1 yrs £12,687
8 kW 8254 kWh 6025 kWh 2228 kWh £1,616 £223 £1,839 £21,526 11.7 yrs £15,249

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 £895
4 kW 4127 kWh 3095 kWh 1032 kWh £830 £103 £933 £15,138 16.2 yrs £3,527
5 kW 5158 kWh 3869 kWh 1290 kWh £1,038 £129 £1,167 £17,173 14.7 yrs £6,159
6 kW 6190 kWh 4643 kWh 1548 kWh £1,245 £155 £1,400 £19,207 13.7 yrs £8,791
7 kW 7222 kWh 5416 kWh 1805 kWh £1,453 £181 £1,633 £21,242 13.0 yrs £11,423
8 kW 8254 kWh 6190 kWh 2063 kWh £1,660 £206 £1,867 £23,276 12.5 yrs £14,055

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 £-4,048
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 £1,355
5 kW 5158 kWh 3972 kWh 1186 kWh £1,065 £119 £1,184 £19,623 16.6 yrs £4,056
6 kW 6190 kWh 4766 kWh 1424 kWh £1,278 £142 £1,421 £21,657 15.2 yrs £6,757
7 kW 7222 kWh 5561 kWh 1661 kWh £1,491 £166 £1,658 £23,692 14.3 yrs £9,459
8 kW 8254 kWh 6355 kWh 1898 kWh £1,704 £190 £1,894 £25,726 13.6 yrs £12,160

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 BS80

Figures below are tailored to BS80 — click through for full league tables.

Solar Payback Index Rank #255 of 2997
10.2 years (UK avg 11.3 years)
~£1,192 /yr • £12,207 upfront
Standing-Charge Drag Rank #625 of 2997
16.5% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,192 /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
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

South Gloucestershire (89%)|North Somerset (11%)

Areas Covered

Filton, Weston-super-Mare South

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

BS34 (South Gloucestershire)
≈0.7 km away
Local sunshine: ~989 kWh/kWp · -4% vs BS80
BS32 (South Gloucestershire)
≈1.9 km away
Local sunshine: ~988 kWh/kWp · -4% vs BS80
BS12 (South Gloucestershire)
≈2.3 km away
Local sunshine: ~983 kWh/kWp · -5% vs BS80
BS10 (Bristol, City of)
≈3.2 km away
Local sunshine: ~992 kWh/kWp · -4% vs BS80
BS7 (Bristol, City of)
≈4.1 km away
Local sunshine: ~992 kWh/kWp · -4% vs BS80
BS9 (Bristol, City of)
≈4.9 km away
Local sunshine: ~996 kWh/kWp · -3% vs BS80

Similar sunshine across the UK

SO3 (Eastleigh)
~1,032 kWh/kWp · +0% vs BS80
SO32 (Winchester)
~1,032 kWh/kWp · +0% vs BS80
ME19 (Tonbridge and Malling)
~1,032 kWh/kWp · +0% vs BS80