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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO7 (Havant)

See if solar pays off for you in Havant — 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
£901
What you save every year
Profit Over 25 Years
£12,359
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 1086 kWh/kW — 85 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 1086 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)
1086 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: £901, 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 2173 kWh 869 kWh 1304 kWh £230 £130 £361 £4,069 11.3 yrs £3,141
3 kW 3259 kWh 1304 kWh 1956 kWh £345 £196 £541 £6,104 11.3 yrs £4,712
4 kW 4346 kWh 1738 kWh 2607 kWh £460 £261 £721 £8,138 11.3 yrs £6,282
5 kW 5432 kWh 2173 kWh 3259 kWh £575 £326 £901 £10,173 11.3 yrs £7,853
6 kW 6518 kWh 2607 kWh 3911 kWh £690 £391 £1,082 £12,207 11.3 yrs £9,424
7 kW 7605 kWh 3042 kWh 4563 kWh £806 £456 £1,262 £14,242 11.3 yrs £10,994
8 kW 8691 kWh 3476 kWh 5215 kWh £921 £521 £1,442 £16,276 11.3 yrs £12,565

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: £1,080, 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 2173 kWh 1304 kWh 869 kWh £345 £87 £432 £6,169 14.3 yrs £2,474
3 kW 3259 kWh 1956 kWh 1304 kWh £518 £130 £648 £8,204 12.7 yrs £4,760
4 kW 4346 kWh 2607 kWh 1738 kWh £690 £174 £864 £10,238 11.8 yrs £7,047
5 kW 5432 kWh 3259 kWh 2173 kWh £863 £217 £1,080 £12,273 11.4 yrs £9,334
6 kW 6518 kWh 3911 kWh 2607 kWh £1,036 £261 £1,296 £14,307 11.0 yrs £11,621
7 kW 7605 kWh 4563 kWh 3042 kWh £1,208 £304 £1,512 £16,342 10.8 yrs £13,907
8 kW 8691 kWh 5215 kWh 3476 kWh £1,381 £348 £1,729 £18,376 10.6 yrs £16,194

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: £1,170, 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 2173 kWh 1521 kWh 652 kWh £403 £65 £468 £7,569 16.2 yrs £1,790
3 kW 3259 kWh 2281 kWh 978 kWh £604 £98 £702 £9,604 13.7 yrs £4,434
4 kW 4346 kWh 3042 kWh 1304 kWh £806 £130 £936 £11,638 12.4 yrs £7,079
5 kW 5432 kWh 3802 kWh 1630 kWh £1,007 £163 £1,170 £13,673 11.7 yrs £9,724
6 kW 6518 kWh 4563 kWh 1956 kWh £1,208 £196 £1,404 £15,707 11.2 yrs £12,369
7 kW 7605 kWh 5323 kWh 2281 kWh £1,410 £228 £1,638 £17,742 10.8 yrs £15,014
8 kW 8691 kWh 6084 kWh 2607 kWh £1,611 £261 £1,872 £19,776 10.6 yrs £17,659

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: £1,197, 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 2173 kWh 1586 kWh 587 kWh £420 £59 £479 £9,319 19.5 yrs £255
3 kW 3259 kWh 2379 kWh 880 kWh £630 £88 £718 £11,354 15.8 yrs £3,007
4 kW 4346 kWh 3172 kWh 1173 kWh £840 £117 £957 £13,388 14.0 yrs £5,759
5 kW 5432 kWh 3965 kWh 1467 kWh £1,050 £147 £1,197 £15,423 12.9 yrs £8,511
6 kW 6518 kWh 4758 kWh 1760 kWh £1,260 £176 £1,436 £17,457 12.2 yrs £11,264
7 kW 7605 kWh 5552 kWh 2053 kWh £1,470 £205 £1,675 £19,492 11.6 yrs £14,016
8 kW 8691 kWh 6345 kWh 2347 kWh £1,680 £235 £1,915 £21,526 11.2 yrs £16,768

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: £1,215, Upfront: £17,173, Break-even: 14.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2173 kWh 1630 kWh 543 kWh £432 £54 £486 £11,069 22.8 yrs £-1,352
3 kW 3259 kWh 2444 kWh 815 kWh £647 £81 £729 £13,104 18.0 yrs £1,472
4 kW 4346 kWh 3259 kWh 1086 kWh £863 £109 £972 £15,138 15.6 yrs £4,295
5 kW 5432 kWh 4074 kWh 1358 kWh £1,079 £136 £1,215 £17,173 14.1 yrs £7,119
6 kW 6518 kWh 4889 kWh 1630 kWh £1,295 £163 £1,458 £19,207 13.2 yrs £9,943
7 kW 7605 kWh 5704 kWh 1901 kWh £1,510 £190 £1,700 £21,242 12.5 yrs £12,767
8 kW 8691 kWh 6518 kWh 2173 kWh £1,726 £217 £1,943 £23,276 12.0 yrs £15,591

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: £1,232, 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 2173 kWh 1673 kWh 500 kWh £443 £50 £493 £13,519 27.4 yrs £-3,659
3 kW 3259 kWh 2510 kWh 750 kWh £665 £75 £739 £15,554 21.0 yrs £-764
4 kW 4346 kWh 3346 kWh 999 kWh £886 £100 £986 £17,588 17.8 yrs £2,132
5 kW 5432 kWh 4183 kWh 1249 kWh £1,108 £125 £1,232 £19,623 15.9 yrs £5,027
6 kW 6518 kWh 5019 kWh 1499 kWh £1,329 £150 £1,479 £21,657 14.6 yrs £7,923
7 kW 7605 kWh 5856 kWh 1749 kWh £1,551 £175 £1,725 £23,692 13.7 yrs £10,818
8 kW 8691 kWh 6692 kWh 1999 kWh £1,772 £200 £1,972 £25,726 13.0 yrs £13,714

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 PO7

Figures below are tailored to PO7 — click through for full league tables.

Big-Roof Britain Rank #927 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #137 of 2997
9.8 years (UK avg 11.3 years)
~£1,036 /yr • £10,173 upfront
Standing-Charge Drag Rank #523 of 2997
15.7% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,036 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1086kWh/kW
A 1 kW system generates ~1086 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: 61% • Flats: 24% • Bungalows: 14% Based on 10,723 properties

Coverage

Havant (72%)|Winchester (27%)

Areas Covered

Waterloo, Denmead, Stakes, Purbrook, Central Meon Valley, Cowplain, Southwick and Wickham, Hart Plain + 2 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

PO8 (East Hampshire)
≈3.2 km away
Local sunshine: ~1,058 kWh/kWp · -3% vs PO7
PO6 (Portsmouth)
≈4.8 km away
Local sunshine: ~1,090 kWh/kWp · +0% vs PO7
PO9 (Havant)
≈5.2 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO7
PO3 (Portsmouth)
≈8.0 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO7
PO2 (Portsmouth)
≈8.0 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO7
PO10 (Havant)
≈8.5 km away
Local sunshine: ~1,133 kWh/kWp · +4% vs PO7

Similar sunshine across the UK

CO15 (Tendring)
~1,086 kWh/kWp · +0% vs PO7
CT14 (Dover)
~1,086 kWh/kWp · -0% vs PO7
CT4 (Canterbury)
~1,087 kWh/kWp · +0% vs PO7