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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO17 (Winchester)

See if solar pays off for you in Winchester — 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
11.4 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£895
What you save every year
Profit Over 25 Years
£12,196
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 1078 kWh/kW — 77 above the regional median (1001).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1078 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)
1078 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: £895, Upfront: £10,173, Break-even: 11.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 863 kWh 1294 kWh £228 £129 £358 £4,069 11.4 yrs £3,089
3 kW 3236 kWh 1294 kWh 1941 kWh £343 £194 £537 £6,104 11.4 yrs £4,633
4 kW 4314 kWh 1726 kWh 2588 kWh £457 £259 £716 £8,138 11.4 yrs £6,178
5 kW 5392 kWh 2157 kWh 3236 kWh £571 £324 £895 £10,173 11.4 yrs £7,722
6 kW 6471 kWh 2588 kWh 3883 kWh £685 £388 £1,074 £12,207 11.4 yrs £9,266
7 kW 7550 kWh 3020 kWh 4530 kWh £800 £453 £1,253 £14,242 11.4 yrs £10,811
8 kW 8628 kWh 3451 kWh 5177 kWh £914 £518 £1,432 £16,276 11.4 yrs £12,355

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: £1,072, Upfront: £12,273, Break-even: 11.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1294 kWh 863 kWh £343 £86 £429 £6,169 14.4 yrs £2,411
3 kW 3236 kWh 1941 kWh 1294 kWh £514 £129 £643 £8,204 12.7 yrs £4,666
4 kW 4314 kWh 2588 kWh 1726 kWh £685 £173 £858 £10,238 11.9 yrs £6,921
5 kW 5392 kWh 3236 kWh 2157 kWh £857 £216 £1,072 £12,273 11.4 yrs £9,177
6 kW 6471 kWh 3883 kWh 2588 kWh £1,028 £259 £1,287 £14,307 11.1 yrs £11,432
7 kW 7550 kWh 4530 kWh 3020 kWh £1,199 £302 £1,501 £16,342 10.9 yrs £13,687
8 kW 8628 kWh 5177 kWh 3451 kWh £1,371 £345 £1,716 £18,376 10.7 yrs £15,943

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: £1,161, Upfront: £13,673, 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 2157 kWh 1510 kWh 647 kWh £400 £65 £465 £7,569 16.3 yrs £1,722
3 kW 3236 kWh 2265 kWh 971 kWh £600 £97 £697 £9,604 13.8 yrs £4,332
4 kW 4314 kWh 3020 kWh 1294 kWh £800 £129 £929 £11,638 12.5 yrs £6,943
5 kW 5392 kWh 3775 kWh 1618 kWh £1,000 £162 £1,161 £13,673 11.8 yrs £9,554
6 kW 6471 kWh 4530 kWh 1941 kWh £1,199 £194 £1,394 £15,707 11.3 yrs £12,165
7 kW 7550 kWh 5285 kWh 2265 kWh £1,399 £226 £1,626 £17,742 10.9 yrs £14,776
8 kW 8628 kWh 6040 kWh 2588 kWh £1,599 £259 £1,858 £19,776 10.6 yrs £17,386

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: £1,188, Upfront: £15,423, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1575 kWh 582 kWh £417 £58 £475 £9,319 19.6 yrs £185
3 kW 3236 kWh 2362 kWh 874 kWh £625 £87 £713 £11,354 15.9 yrs £2,902
4 kW 4314 kWh 3149 kWh 1165 kWh £834 £116 £950 £13,388 14.1 yrs £5,620
5 kW 5392 kWh 3937 kWh 1456 kWh £1,042 £146 £1,188 £15,423 13.0 yrs £8,337
6 kW 6471 kWh 4724 kWh 1747 kWh £1,251 £175 £1,426 £17,457 12.2 yrs £11,055
7 kW 7550 kWh 5511 kWh 2038 kWh £1,459 £204 £1,663 £19,492 11.7 yrs £13,772
8 kW 8628 kWh 6298 kWh 2330 kWh £1,668 £233 £1,901 £21,526 11.3 yrs £16,490

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: £1,206, Upfront: £17,173, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1618 kWh 539 kWh £428 £54 £482 £11,069 23.0 yrs £-1,423
3 kW 3236 kWh 2427 kWh 809 kWh £643 £81 £723 £13,104 18.1 yrs £1,366
4 kW 4314 kWh 3236 kWh 1078 kWh £857 £108 £965 £15,138 15.7 yrs £4,154
5 kW 5392 kWh 4044 kWh 1348 kWh £1,071 £135 £1,206 £17,173 14.2 yrs £6,943
6 kW 6471 kWh 4853 kWh 1618 kWh £1,285 £162 £1,447 £19,207 13.3 yrs £9,731
7 kW 7550 kWh 5662 kWh 1887 kWh £1,499 £189 £1,688 £21,242 12.6 yrs £12,520
8 kW 8628 kWh 6471 kWh 2157 kWh £1,714 £216 £1,929 £23,276 12.1 yrs £15,308

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: £1,224, Upfront: £19,623, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1661 kWh 496 kWh £440 £50 £489 £13,519 27.6 yrs £-3,731
3 kW 3236 kWh 2491 kWh 744 kWh £660 £74 £734 £15,554 21.2 yrs £-871
4 kW 4314 kWh 3322 kWh 992 kWh £880 £99 £979 £17,588 18.0 yrs £1,989
5 kW 5392 kWh 4152 kWh 1240 kWh £1,100 £124 £1,224 £19,623 16.0 yrs £4,848
6 kW 6471 kWh 4983 kWh 1488 kWh £1,319 £149 £1,468 £21,657 14.8 yrs £7,708
7 kW 7550 kWh 5813 kWh 1736 kWh £1,539 £174 £1,713 £23,692 13.8 yrs £10,567
8 kW 8628 kWh 6644 kWh 1984 kWh £1,759 £198 £1,958 £25,726 13.1 yrs £13,427

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 PO17

Figures below are tailored to PO17 — click through for full league tables.

Big-Roof Britain Rank #874 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #165 of 2997
9.9 years (UK avg 11.3 years)
~£1,028 /yr • £10,173 upfront
Standing-Charge Drag Rank #534 of 2997
15.8% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,028 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1078kWh/kW
A 1 kW system generates ~1078 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 65% • Flats: 24% • Bungalows: 8% Based on 2,014 properties

Coverage

Winchester (85%)|Fareham (15%)

Areas Covered

Southwick and Wickham, Central Meon Valley, Uplands & Funtley, Wallington & Downend, Fort Fareham, Whiteley and Shedfield, Portchester Castle, Paulsgrove

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

PO15 (Fareham)
≈3.7 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
PO16 (Fareham)
≈4.4 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
PO14 (Fareham)
≈5.5 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
SO32 (Winchester)
≈6.7 km away
Local sunshine: ~1,032 kWh/kWp · -4% vs PO17
SO31 (Fareham)
≈7.2 km away
Local sunshine: ~1,076 kWh/kWp · -0% vs PO17
SO3 (Eastleigh)
≈7.8 km away
Local sunshine: ~1,032 kWh/kWp · -4% vs PO17

Similar sunshine across the UK

CT11 (Thanet)
~1,078 kWh/kWp · -0% vs PO17
DT6 (Dorset)
~1,079 kWh/kWp · +0% vs PO17
IP12 (East Suffolk)
~1,077 kWh/kWp · -0% vs PO17