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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO10 (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
10.8 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£940
What you save every year
Profit Over 25 Years
£13,316
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 1133 kWh/kW — 131 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 1133 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)
1133 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: £940, Upfront: £10,173, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 906 kWh 1359 kWh £240 £136 £376 £4,069 10.8 yrs £3,447
3 kW 3398 kWh 1359 kWh 2039 kWh £360 £204 £564 £6,104 10.8 yrs £5,171
4 kW 4530 kWh 1812 kWh 2718 kWh £480 £272 £752 £8,138 10.8 yrs £6,895
5 kW 5663 kWh 2265 kWh 3398 kWh £600 £340 £940 £10,173 10.8 yrs £8,618
6 kW 6795 kWh 2718 kWh 4077 kWh £720 £408 £1,127 £12,207 10.8 yrs £10,342
7 kW 7928 kWh 3171 kWh 4757 kWh £840 £476 £1,315 £14,242 10.8 yrs £12,066
8 kW 9060 kWh 3624 kWh 5436 kWh £960 £544 £1,503 £16,276 10.8 yrs £13,789

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: £1,126, Upfront: £12,273, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 1359 kWh 906 kWh £360 £91 £450 £6,169 13.7 yrs £2,840
3 kW 3398 kWh 2039 kWh 1359 kWh £540 £136 £676 £8,204 12.1 yrs £5,311
4 kW 4530 kWh 2718 kWh 1812 kWh £720 £181 £901 £10,238 11.4 yrs £7,781
5 kW 5663 kWh 3398 kWh 2265 kWh £900 £227 £1,126 £12,273 10.9 yrs £10,251
6 kW 6795 kWh 4077 kWh 2718 kWh £1,080 £272 £1,351 £14,307 10.6 yrs £12,721
7 kW 7928 kWh 4757 kWh 3171 kWh £1,260 £317 £1,577 £16,342 10.4 yrs £15,191
8 kW 9060 kWh 5436 kWh 3624 kWh £1,439 £362 £1,802 £18,376 10.2 yrs £17,662

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: £1,219, Upfront: £13,673, Break-even: 11.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 1586 kWh 680 kWh £420 £68 £488 £7,569 15.5 yrs £2,187
3 kW 3398 kWh 2378 kWh 1019 kWh £630 £102 £732 £9,604 13.1 yrs £5,030
4 kW 4530 kWh 3171 kWh 1359 kWh £840 £136 £976 £11,638 11.9 yrs £7,874
5 kW 5663 kWh 3964 kWh 1699 kWh £1,050 £170 £1,219 £13,673 11.2 yrs £10,717
6 kW 6795 kWh 4757 kWh 2039 kWh £1,260 £204 £1,463 £15,707 10.7 yrs £13,561
7 kW 7928 kWh 5549 kWh 2378 kWh £1,469 £238 £1,707 £17,742 10.4 yrs £16,404
8 kW 9060 kWh 6342 kWh 2718 kWh £1,679 £272 £1,951 £19,776 10.1 yrs £19,248

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: £1,247, Upfront: £15,423, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 1653 kWh 612 kWh £438 £61 £499 £9,319 18.7 yrs £661
3 kW 3398 kWh 2480 kWh 917 kWh £657 £92 £748 £11,354 15.2 yrs £3,616
4 kW 4530 kWh 3307 kWh 1223 kWh £876 £122 £998 £13,388 13.4 yrs £6,572
5 kW 5663 kWh 4134 kWh 1529 kWh £1,095 £153 £1,247 £15,423 12.4 yrs £9,527
6 kW 6795 kWh 4960 kWh 1835 kWh £1,314 £183 £1,497 £17,457 11.7 yrs £12,483
7 kW 7928 kWh 5787 kWh 2140 kWh £1,532 £214 £1,746 £19,492 11.2 yrs £15,438
8 kW 9060 kWh 6614 kWh 2446 kWh £1,751 £245 £1,996 £21,526 10.8 yrs £18,394

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: £1,266, Upfront: £17,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 1699 kWh 566 kWh £450 £57 £506 £11,069 21.9 yrs £-940
3 kW 3398 kWh 2548 kWh 849 kWh £675 £85 £760 £13,104 17.2 yrs £2,090
4 kW 4530 kWh 3398 kWh 1133 kWh £900 £113 £1,013 £15,138 14.9 yrs £5,120
5 kW 5663 kWh 4247 kWh 1416 kWh £1,125 £142 £1,266 £17,173 13.6 yrs £8,151
6 kW 6795 kWh 5096 kWh 1699 kWh £1,350 £170 £1,519 £19,207 12.6 yrs £11,181
7 kW 7928 kWh 5946 kWh 1982 kWh £1,574 £198 £1,773 £21,242 12.0 yrs £14,211
8 kW 9060 kWh 6795 kWh 2265 kWh £1,799 £227 £2,026 £23,276 11.5 yrs £17,241

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: £1,285, Upfront: £19,623, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2265 kWh 1744 kWh 521 kWh £462 £52 £514 £13,519 26.3 yrs £-3,240
3 kW 3398 kWh 2616 kWh 781 kWh £693 £78 £771 £15,554 20.2 yrs £-136
4 kW 4530 kWh 3488 kWh 1042 kWh £924 £104 £1,028 £17,588 17.1 yrs £2,969
5 kW 5663 kWh 4360 kWh 1302 kWh £1,155 £130 £1,285 £19,623 15.3 yrs £6,074
6 kW 6795 kWh 5232 kWh 1563 kWh £1,385 £156 £1,542 £21,657 14.0 yrs £9,179
7 kW 7928 kWh 6104 kWh 1823 kWh £1,616 £182 £1,799 £23,692 13.2 yrs £12,283
8 kW 9060 kWh 6976 kWh 2084 kWh £1,847 £208 £2,056 £25,726 12.5 yrs £15,388

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 PO10

Figures below are tailored to PO10 — click through for full league tables.

Big-Roof Britain Rank #676 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #25 of 2997
9.4 years (UK avg 11.3 years)
~£1,080 /yr • £10,173 upfront
Standing-Charge Drag Rank #266 of 2997
15.1% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,080 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1133kWh/kW
A 1 kW system generates ~1133 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: 73% • Flats: 14% • Bungalows: 12% Based on 5,075 properties

Coverage

Havant (58%)|Chichester (42%)

Areas Covered

Emsworth, Southbourne, Westbourne, Havant St Faith's

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

PO9 (Havant)
≈3.4 km away
Local sunshine: ~1,096 kWh/kWp · -3% vs PO10
PO11 (Havant)
≈7.3 km away
Local sunshine: ~1,096 kWh/kWp · -3% vs PO10
PO18 (Chichester)
≈8.0 km away
Local sunshine: ~1,108 kWh/kWp · -2% vs PO10
PO8 (East Hampshire)
≈8.5 km away
Local sunshine: ~1,058 kWh/kWp · -7% vs PO10
PO7 (Havant)
≈8.5 km away
Local sunshine: ~1,086 kWh/kWp · -4% vs PO10
PO6 (Portsmouth)
≈9.4 km away
Local sunshine: ~1,090 kWh/kWp · -4% vs PO10

Similar sunshine across the UK

BN27 (Wealden)
~1,134 kWh/kWp · +0% vs PO10
BN25 (Lewes)
~1,131 kWh/kWp · -0% vs PO10
BN21 (Eastbourne)
~1,135 kWh/kWp · +0% vs PO10