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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO13 (Gosport)

See if solar pays off for you in Gosport — 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
11.3 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£900
What you save every year
Profit Over 25 Years
£12,340
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 1085 kWh/kW — 84 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 1085 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)
1085 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: £900, Upfront: £10,173, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2171 kWh 868 kWh 1303 kWh £230 £130 £360 £4,069 11.3 yrs £3,135
3 kW 3256 kWh 1303 kWh 1954 kWh £345 £195 £540 £6,104 11.3 yrs £4,702
4 kW 4342 kWh 1737 kWh 2605 kWh £460 £261 £720 £8,138 11.3 yrs £6,270
5 kW 5427 kWh 2171 kWh 3256 kWh £575 £326 £900 £10,173 11.3 yrs £7,837
6 kW 6513 kWh 2605 kWh 3908 kWh £690 £391 £1,081 £12,207 11.3 yrs £9,405
7 kW 7598 kWh 3039 kWh 4559 kWh £805 £456 £1,261 £14,242 11.3 yrs £10,972
8 kW 8684 kWh 3473 kWh 5210 kWh £920 £521 £1,441 £16,276 11.3 yrs £12,540

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: £1,079, 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 2171 kWh 1303 kWh 868 kWh £345 £87 £432 £6,169 14.3 yrs £2,466
3 kW 3256 kWh 1954 kWh 1303 kWh £517 £130 £648 £8,204 12.7 yrs £4,749
4 kW 4342 kWh 2605 kWh 1737 kWh £690 £174 £864 £10,238 11.9 yrs £7,032
5 kW 5427 kWh 3256 kWh 2171 kWh £862 £217 £1,079 £12,273 11.4 yrs £9,315
6 kW 6513 kWh 3908 kWh 2605 kWh £1,035 £261 £1,295 £14,307 11.0 yrs £11,598
7 kW 7598 kWh 4559 kWh 3039 kWh £1,207 £304 £1,511 £16,342 10.8 yrs £13,881
8 kW 8684 kWh 5210 kWh 3473 kWh £1,380 £347 £1,727 £18,376 10.6 yrs £16,164

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: £1,169, Upfront: £13,673, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2171 kWh 1520 kWh 651 kWh £402 £65 £468 £7,569 16.2 yrs £1,782
3 kW 3256 kWh 2279 kWh 977 kWh £604 £98 £701 £9,604 13.7 yrs £4,422
4 kW 4342 kWh 3039 kWh 1303 kWh £805 £130 £935 £11,638 12.4 yrs £7,063
5 kW 5427 kWh 3799 kWh 1628 kWh £1,006 £163 £1,169 £13,673 11.7 yrs £9,704
6 kW 6513 kWh 4559 kWh 1954 kWh £1,207 £195 £1,403 £15,707 11.2 yrs £12,345
7 kW 7598 kWh 5319 kWh 2279 kWh £1,408 £228 £1,636 £17,742 10.8 yrs £14,985
8 kW 8684 kWh 6079 kWh 2605 kWh £1,610 £261 £1,870 £19,776 10.6 yrs £17,626

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: £1,196, Upfront: £15,423, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2171 kWh 1585 kWh 586 kWh £420 £59 £478 £9,319 19.5 yrs £246
3 kW 3256 kWh 2377 kWh 879 kWh £629 £88 £717 £11,354 15.8 yrs £2,994
4 kW 4342 kWh 3170 kWh 1172 kWh £839 £117 £957 £13,388 14.0 yrs £5,742
5 kW 5427 kWh 3962 kWh 1465 kWh £1,049 £147 £1,196 £15,423 12.9 yrs £8,491
6 kW 6513 kWh 4754 kWh 1758 kWh £1,259 £176 £1,435 £17,457 12.2 yrs £11,239
7 kW 7598 kWh 5547 kWh 2052 kWh £1,469 £205 £1,674 £19,492 11.6 yrs £13,987
8 kW 8684 kWh 6339 kWh 2345 kWh £1,679 £234 £1,913 £21,526 11.3 yrs £16,735

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: £1,214, 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 2171 kWh 1628 kWh 543 kWh £431 £54 £485 £11,069 22.8 yrs £-1,361
3 kW 3256 kWh 2442 kWh 814 kWh £647 £81 £728 £13,104 18.0 yrs £1,459
4 kW 4342 kWh 3256 kWh 1085 kWh £862 £109 £971 £15,138 15.6 yrs £4,279
5 kW 5427 kWh 4070 kWh 1357 kWh £1,078 £136 £1,214 £17,173 14.2 yrs £7,098
6 kW 6513 kWh 4885 kWh 1628 kWh £1,293 £163 £1,456 £19,207 13.2 yrs £9,918
7 kW 7598 kWh 5699 kWh 1900 kWh £1,509 £190 £1,699 £21,242 12.5 yrs £12,738
8 kW 8684 kWh 6513 kWh 2171 kWh £1,725 £217 £1,942 £23,276 12.0 yrs £15,557

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: £1,231, Upfront: £19,623, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2171 kWh 1672 kWh 499 kWh £443 £50 £493 £13,519 27.4 yrs £-3,668
3 kW 3256 kWh 2507 kWh 749 kWh £664 £75 £739 £15,554 21.1 yrs £-776
4 kW 4342 kWh 3343 kWh 999 kWh £885 £100 £985 £17,588 17.9 yrs £2,115
5 kW 5427 kWh 4179 kWh 1248 kWh £1,107 £125 £1,231 £19,623 15.9 yrs £5,006
6 kW 6513 kWh 5015 kWh 1498 kWh £1,328 £150 £1,478 £21,657 14.7 yrs £7,897
7 kW 7598 kWh 5851 kWh 1748 kWh £1,549 £175 £1,724 £23,692 13.7 yrs £10,789
8 kW 8684 kWh 6686 kWh 1997 kWh £1,771 £200 £1,970 £25,726 13.1 yrs £13,680

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 PO13

Figures below are tailored to PO13 — click through for full league tables.

Big-Roof Britain Rank #1340 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #131 of 2997
9.8 years (UK avg 11.3 years)
~£1,035 /yr • £10,173 upfront
Standing-Charge Drag Rank #517 of 2997
15.7% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,035 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1085kWh/kW
A 1 kW system generates ~1085 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: 62% • Flats: 24% • Bungalows: 7% Based on 9,443 properties

Coverage

Gosport (98%)|Fareham (2%)

Areas Covered

Grange & Alver Valley, Lee West, Bridgemary, Rowner & Holbrook, Lee East, Peel Common, Forton, Stubbington + 4 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

PO12 (Gosport)
≈2.4 km away
Local sunshine: ~1,072 kWh/kWp · -1% vs PO13
PO14 (Fareham)
≈4.6 km away
Local sunshine: ~1,078 kWh/kWp · -1% vs PO13
PO16 (Fareham)
≈4.7 km away
Local sunshine: ~1,078 kWh/kWp · -1% vs PO13
PO1 (Portsmouth)
≈6.2 km away
Local sunshine: ~1,084 kWh/kWp · -0% vs PO13
PO15 (Fareham)
≈6.5 km away
Local sunshine: ~1,078 kWh/kWp · -1% vs PO13
PO5 (Portsmouth)
≈6.6 km away
Local sunshine: ~1,084 kWh/kWp · -0% vs PO13

Similar sunshine across the UK

CT9 (Thanet)
~1,086 kWh/kWp · +0% vs PO13
PL21 (South Hams)
~1,086 kWh/kWp · +0% vs PO13
BN44 (Horsham)
~1,086 kWh/kWp · +0% vs PO13