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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in OX13 (Vale of White Horse)

See if solar pays off for you in Vale of White Horse — 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
12.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,003
What you save every year
Profit Over 25 Years
£12,875
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, the current unit rate is 26.48p/kWh with a 44.62p/day standing charge. Your postcode’s south-facing sunshine yield is 1008 kWh/kW — 7 above the regional median (1001).

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 1008 kWh per year on a south-facing roof. We value self-used electricity at 26.5p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.5p/kWh
Standing charge
44.6p/day
Sunshine yield (south)
1008 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: £836, Upfront: £10,173, 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 2016 kWh 806 kWh 1209 kWh £213 £121 £334 £4,069 12.2 yrs £2,620
3 kW 3023 kWh 1209 kWh 1814 kWh £320 £181 £502 £6,104 12.2 yrs £3,929
4 kW 4031 kWh 1612 kWh 2419 kWh £427 £242 £669 £8,138 12.2 yrs £5,239
5 kW 5039 kWh 2016 kWh 3023 kWh £534 £302 £836 £10,173 12.2 yrs £6,549
6 kW 6047 kWh 2419 kWh 3628 kWh £640 £363 £1,003 £12,207 12.2 yrs £7,859
7 kW 7055 kWh 2822 kWh 4233 kWh £747 £423 £1,170 £14,242 12.2 yrs £9,168
8 kW 8062 kWh 3225 kWh 4837 kWh £854 £484 £1,338 £16,276 12.2 yrs £10,478

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: £1,002, 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 2016 kWh 1209 kWh 806 kWh £320 £81 £401 £6,169 15.4 yrs £1,848
3 kW 3023 kWh 1814 kWh 1209 kWh £480 £121 £601 £8,204 13.6 yrs £3,822
4 kW 4031 kWh 2419 kWh 1612 kWh £640 £161 £802 £10,238 12.8 yrs £5,796
5 kW 5039 kWh 3023 kWh 2016 kWh £801 £202 £1,002 £12,273 12.2 yrs £7,771
6 kW 6047 kWh 3628 kWh 2419 kWh £961 £242 £1,203 £14,307 11.9 yrs £9,745
7 kW 7055 kWh 4233 kWh 2822 kWh £1,121 £282 £1,403 £16,342 11.6 yrs £11,719
8 kW 8062 kWh 4837 kWh 3225 kWh £1,281 £322 £1,603 £18,376 11.5 yrs £13,693

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: £1,085, Upfront: £13,673, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2016 kWh 1411 kWh 605 kWh £374 £60 £434 £7,569 17.4 yrs £1,113
3 kW 3023 kWh 2116 kWh 907 kWh £560 £91 £651 £9,604 14.7 yrs £3,419
4 kW 4031 kWh 2822 kWh 1209 kWh £747 £121 £868 £11,638 13.4 yrs £5,725
5 kW 5039 kWh 3527 kWh 1512 kWh £934 £151 £1,085 £13,673 12.6 yrs £8,031
6 kW 6047 kWh 4233 kWh 1814 kWh £1,121 £181 £1,302 £15,707 12.1 yrs £10,338
7 kW 7055 kWh 4938 kWh 2116 kWh £1,308 £212 £1,519 £17,742 11.7 yrs £12,644
8 kW 8062 kWh 5644 kWh 2419 kWh £1,494 £242 £1,736 £19,776 11.4 yrs £14,950

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: £1,110, Upfront: £15,423, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2016 kWh 1471 kWh 544 kWh £390 £54 £444 £9,319 21.0 yrs £-438
3 kW 3023 kWh 2207 kWh 816 kWh £584 £82 £666 £11,354 17.0 yrs £1,968
4 kW 4031 kWh 2943 kWh 1088 kWh £779 £109 £888 £13,388 15.1 yrs £4,374
5 kW 5039 kWh 3678 kWh 1361 kWh £974 £136 £1,110 £15,423 13.9 yrs £6,780
6 kW 6047 kWh 4414 kWh 1633 kWh £1,169 £163 £1,332 £17,457 13.1 yrs £9,186
7 kW 7055 kWh 5150 kWh 1905 kWh £1,364 £190 £1,554 £19,492 12.5 yrs £11,592
8 kW 8062 kWh 5886 kWh 2177 kWh £1,558 £218 £1,776 £21,526 12.1 yrs £13,997

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: £1,127, 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 2016 kWh 1512 kWh 504 kWh £400 £50 £451 £11,069 24.6 yrs £-2,055
3 kW 3023 kWh 2268 kWh 756 kWh £600 £76 £676 £13,104 19.4 yrs £417
4 kW 4031 kWh 3023 kWh 1008 kWh £801 £101 £901 £15,138 16.8 yrs £2,889
5 kW 5039 kWh 3779 kWh 1260 kWh £1,001 £126 £1,127 £17,173 15.2 yrs £5,362
6 kW 6047 kWh 4535 kWh 1512 kWh £1,201 £151 £1,352 £19,207 14.2 yrs £7,834
7 kW 7055 kWh 5291 kWh 1764 kWh £1,401 £176 £1,577 £21,242 13.5 yrs £10,307
8 kW 8062 kWh 6047 kWh 2016 kWh £1,601 £202 £1,803 £23,276 12.9 yrs £12,779

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: £1,143, Upfront: £19,623, Break-even: 17.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2016 kWh 1552 kWh 464 kWh £411 £46 £457 £13,519 29.6 yrs £-4,372
3 kW 3023 kWh 2328 kWh 695 kWh £616 £70 £686 £15,554 22.7 yrs £-1,834
4 kW 4031 kWh 3104 kWh 927 kWh £822 £93 £915 £17,588 19.2 yrs £705
5 kW 5039 kWh 3880 kWh 1159 kWh £1,027 £116 £1,143 £19,623 17.2 yrs £3,244
6 kW 6047 kWh 4656 kWh 1391 kWh £1,233 £139 £1,372 £21,657 15.8 yrs £5,783
7 kW 7055 kWh 5432 kWh 1623 kWh £1,438 £162 £1,601 £23,692 14.8 yrs £8,322
8 kW 8062 kWh 6208 kWh 1854 kWh £1,644 £185 £1,829 £25,726 14.1 yrs £10,860

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 OX13

Figures below are tailored to OX13 — click through for full league tables.

Big-Roof Britain Rank #366 of 2182
5.8 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #693 of 2997
10.6 years (UK avg 11.3 years)
~£1,153 /yr • £12,207 upfront
Standing-Charge Drag Rank #102 of 2997
14.1% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,153 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1008kWh/kW
A 1 kW system generates ~1008 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: 83% • Flats: 6% • Bungalows: 10% Based on 5,066 properties

Coverage

Vale of White Horse (100%)

Areas Covered

Marcham, Kingston Bagpuize, Thames, Wootton, Steventon & the Hanneys, Abingdon Abbey Northcourt, Abingdon Caldecott, Hendreds + 5 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

OX14 (Vale of White Horse)
≈3.9 km away
Local sunshine: ~998 kWh/kWp · -1% vs OX13
OX1 (Oxford)
≈9.3 km away
Local sunshine: ~987 kWh/kWp · -2% vs OX13
OX4 (Oxford)
≈9.8 km away
Local sunshine: ~989 kWh/kWp · -2% vs OX13
OX2 (Oxford)
≈10.0 km away
Local sunshine: ~987 kWh/kWp · -2% vs OX13
OX11 (South Oxfordshire)
≈10.6 km away
Local sunshine: ~1,010 kWh/kWp · +0% vs OX13
OX12 (Vale of White Horse)
≈11.7 km away
Local sunshine: ~1,008 kWh/kWp · +0% vs OX13

Similar sunshine across the UK

IG7 (Epping Forest)
~1,008 kWh/kWp · -0% vs OX13
RH1 (Reigate and Banstead)
~1,008 kWh/kWp · -0% vs OX13
SG10 (East Hertfordshire)
~1,008 kWh/kWp · -0% vs OX13