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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO8 (East Hampshire)

See if solar pays off for you in East Hampshire — 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
11.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,053
What you save every year
Profit Over 25 Years
£14,115
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 1058 kWh/kW — 56 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 1058 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)
1058 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: £877, Upfront: £10,173, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2115 kWh 846 kWh 1269 kWh £224 £127 £351 £4,069 11.6 yrs £2,950
3 kW 3173 kWh 1269 kWh 1904 kWh £336 £190 £526 £6,104 11.6 yrs £4,425
4 kW 4230 kWh 1692 kWh 2538 kWh £448 £254 £702 £8,138 11.6 yrs £5,900
5 kW 5288 kWh 2115 kWh 3173 kWh £560 £317 £877 £10,173 11.6 yrs £7,375
6 kW 6346 kWh 2538 kWh 3807 kWh £672 £381 £1,053 £12,207 11.6 yrs £8,851
7 kW 7403 kWh 2961 kWh 4442 kWh £784 £444 £1,228 £14,242 11.6 yrs £10,326
8 kW 8461 kWh 3384 kWh 5077 kWh £896 £508 £1,404 £16,276 11.6 yrs £11,801

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: £1,052, Upfront: £12,273, 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 2115 kWh 1269 kWh 846 kWh £336 £85 £421 £6,169 14.7 yrs £2,245
3 kW 3173 kWh 1904 kWh 1269 kWh £504 £127 £631 £8,204 13.0 yrs £4,417
4 kW 4230 kWh 2538 kWh 1692 kWh £672 £169 £841 £10,238 12.2 yrs £6,589
5 kW 5288 kWh 3173 kWh 2115 kWh £840 £212 £1,052 £12,273 11.7 yrs £8,761
6 kW 6346 kWh 3807 kWh 2538 kWh £1,008 £254 £1,262 £14,307 11.3 yrs £10,934
7 kW 7403 kWh 4442 kWh 2961 kWh £1,176 £296 £1,472 £16,342 11.1 yrs £13,106
8 kW 8461 kWh 5077 kWh 3384 kWh £1,344 £338 £1,683 £18,376 10.9 yrs £15,278

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: £1,139, Upfront: £13,673, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2115 kWh 1481 kWh 635 kWh £392 £63 £456 £7,569 16.6 yrs £1,542
3 kW 3173 kWh 2221 kWh 952 kWh £588 £95 £683 £9,604 14.1 yrs £4,063
4 kW 4230 kWh 2961 kWh 1269 kWh £784 £127 £911 £11,638 12.8 yrs £6,583
5 kW 5288 kWh 3702 kWh 1586 kWh £980 £159 £1,139 £13,673 12.0 yrs £9,104
6 kW 6346 kWh 4442 kWh 1904 kWh £1,176 £190 £1,367 £15,707 11.5 yrs £11,625
7 kW 7403 kWh 5182 kWh 2221 kWh £1,372 £222 £1,594 £17,742 11.1 yrs £14,146
8 kW 8461 kWh 5923 kWh 2538 kWh £1,568 £254 £1,822 £19,776 10.9 yrs £16,667

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: £1,165, Upfront: £15,423, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2115 kWh 1544 kWh 571 kWh £409 £57 £466 £9,319 20.0 yrs £1
3 kW 3173 kWh 2316 kWh 857 kWh £613 £86 £699 £11,354 16.2 yrs £2,626
4 kW 4230 kWh 3088 kWh 1142 kWh £818 £114 £932 £13,388 14.4 yrs £5,252
5 kW 5288 kWh 3860 kWh 1428 kWh £1,022 £143 £1,165 £15,423 13.2 yrs £7,877
6 kW 6346 kWh 4632 kWh 1713 kWh £1,227 £171 £1,398 £17,457 12.5 yrs £10,503
7 kW 7403 kWh 5404 kWh 1999 kWh £1,431 £200 £1,631 £19,492 12.0 yrs £13,128
8 kW 8461 kWh 6177 kWh 2284 kWh £1,636 £228 £1,864 £21,526 11.5 yrs £15,754

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: £1,182, Upfront: £17,173, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2115 kWh 1586 kWh 529 kWh £420 £53 £473 £11,069 23.4 yrs £-1,610
3 kW 3173 kWh 2380 kWh 793 kWh £630 £79 £709 £13,104 18.5 yrs £1,085
4 kW 4230 kWh 3173 kWh 1058 kWh £840 £106 £946 £15,138 16.0 yrs £3,781
5 kW 5288 kWh 3966 kWh 1322 kWh £1,050 £132 £1,182 £17,173 14.5 yrs £6,476
6 kW 6346 kWh 4759 kWh 1586 kWh £1,260 £159 £1,419 £19,207 13.5 yrs £9,171
7 kW 7403 kWh 5553 kWh 1851 kWh £1,470 £185 £1,655 £21,242 12.8 yrs £11,866
8 kW 8461 kWh 6346 kWh 2115 kWh £1,680 £212 £1,892 £23,276 12.3 yrs £14,561

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: £1,200, Upfront: £19,623, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2115 kWh 1629 kWh 487 kWh £431 £49 £480 £13,519 28.2 yrs £-3,920
3 kW 3173 kWh 2443 kWh 730 kWh £647 £73 £720 £15,554 21.6 yrs £-1,155
4 kW 4230 kWh 3257 kWh 973 kWh £863 £97 £960 £17,588 18.3 yrs £1,610
5 kW 5288 kWh 4072 kWh 1216 kWh £1,078 £122 £1,200 £19,623 16.4 yrs £4,374
6 kW 6346 kWh 4886 kWh 1460 kWh £1,294 £146 £1,440 £21,657 15.0 yrs £7,139
7 kW 7403 kWh 5701 kWh 1703 kWh £1,510 £170 £1,680 £23,692 14.1 yrs £9,904
8 kW 8461 kWh 6515 kWh 1946 kWh £1,725 £195 £1,920 £25,726 13.4 yrs £12,669

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 PO8

Figures below are tailored to PO8 — click through for full league tables.

Big-Roof Britain Rank #430 of 2182
5.7 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #238 of 2997
10.1 years (UK avg 11.3 years)
~£1,210 /yr • £12,207 upfront
Standing-Charge Drag Rank #60 of 2997
13.5% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,210 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1058kWh/kW
A 1 kW system generates ~1058 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: 58% • Flats: 18% • Bungalows: 22% Based on 7,606 properties

Coverage

East Hampshire (55%)|Havant (45%)|Winchester (1%)

Areas Covered

Hart Plain, Cowplain, Horndean Kings & Blendworth, Clanfield, Waterloo, Horndean Downs, Horndean Murray, Horndean Catherington + 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

PO7 (Havant)
≈3.2 km away
Local sunshine: ~1,086 kWh/kWp · +3% vs PO8
PO9 (Havant)
≈5.7 km away
Local sunshine: ~1,096 kWh/kWp · +4% vs PO8
PO6 (Portsmouth)
≈7.9 km away
Local sunshine: ~1,090 kWh/kWp · +3% vs PO8
PO10 (Havant)
≈8.5 km away
Local sunshine: ~1,133 kWh/kWp · +7% vs PO8
PO3 (Portsmouth)
≈10.8 km away
Local sunshine: ~1,096 kWh/kWp · +4% vs PO8
PO2 (Portsmouth)
≈11.0 km away
Local sunshine: ~1,096 kWh/kWp · +4% vs PO8

Similar sunshine across the UK

TQ9 (South Hams)
~1,058 kWh/kWp · -0% vs PO8
TQ4 (Torbay)
~1,058 kWh/kWp · +0% vs PO8
NR14 (South Norfolk)
~1,057 kWh/kWp · -0% vs PO8