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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO6 (Portsmouth)

See if solar pays off for you in Portsmouth — 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
11.2 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£904
What you save every year
Profit Over 25 Years
£12,438
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 1090 kWh/kW — 89 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 1090 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)
1090 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: £904, Upfront: £10,173, 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 2180 kWh 872 kWh 1308 kWh £231 £131 £362 £4,069 11.2 yrs £3,166
3 kW 3271 kWh 1308 kWh 1962 kWh £346 £196 £543 £6,104 11.2 yrs £4,749
4 kW 4361 kWh 1744 kWh 2616 kWh £462 £262 £724 £8,138 11.2 yrs £6,332
5 kW 5451 kWh 2180 kWh 3271 kWh £577 £327 £904 £10,173 11.2 yrs £7,916
6 kW 6541 kWh 2616 kWh 3925 kWh £693 £392 £1,085 £12,207 11.2 yrs £9,499
7 kW 7631 kWh 3052 kWh 4579 kWh £808 £458 £1,266 £14,242 11.2 yrs £11,082
8 kW 8721 kWh 3489 kWh 5233 kWh £924 £523 £1,447 £16,276 11.2 yrs £12,665

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: £1,084, Upfront: £12,273, 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 2180 kWh 1308 kWh 872 kWh £346 £87 £434 £6,169 14.2 yrs £2,504
3 kW 3271 kWh 1962 kWh 1308 kWh £520 £131 £650 £8,204 12.6 yrs £4,805
4 kW 4361 kWh 2616 kWh 1744 kWh £693 £174 £867 £10,238 11.8 yrs £7,107
5 kW 5451 kWh 3271 kWh 2180 kWh £866 £218 £1,084 £12,273 11.3 yrs £9,409
6 kW 6541 kWh 3925 kWh 2616 kWh £1,039 £262 £1,301 £14,307 11.0 yrs £11,711
7 kW 7631 kWh 4579 kWh 3052 kWh £1,212 £305 £1,518 £16,342 10.8 yrs £14,012
8 kW 8721 kWh 5233 kWh 3489 kWh £1,386 £349 £1,735 £18,376 10.6 yrs £16,314

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: £1,174, Upfront: £13,673, 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 2180 kWh 1526 kWh 654 kWh £404 £65 £470 £7,569 16.1 yrs £1,822
3 kW 3271 kWh 2289 kWh 981 kWh £606 £98 £704 £9,604 13.6 yrs £4,483
4 kW 4361 kWh 3052 kWh 1308 kWh £808 £131 £939 £11,638 12.4 yrs £7,144
5 kW 5451 kWh 3816 kWh 1635 kWh £1,010 £164 £1,174 £13,673 11.6 yrs £9,805
6 kW 6541 kWh 4579 kWh 1962 kWh £1,212 £196 £1,409 £15,707 11.2 yrs £12,466
7 kW 7631 kWh 5342 kWh 2289 kWh £1,415 £229 £1,643 £17,742 10.8 yrs £15,127
8 kW 8721 kWh 6105 kWh 2616 kWh £1,617 £262 £1,878 £19,776 10.5 yrs £17,789

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: £1,201, Upfront: £15,423, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2180 kWh 1592 kWh 589 kWh £421 £59 £480 £9,319 19.4 yrs £288
3 kW 3271 kWh 2387 kWh 883 kWh £632 £88 £721 £11,354 15.8 yrs £3,057
4 kW 4361 kWh 3183 kWh 1177 kWh £843 £118 £961 £13,388 13.9 yrs £5,825
5 kW 5451 kWh 3979 kWh 1472 kWh £1,054 £147 £1,201 £15,423 12.8 yrs £8,594
6 kW 6541 kWh 4775 kWh 1766 kWh £1,264 £177 £1,441 £17,457 12.1 yrs £11,363
7 kW 7631 kWh 5571 kWh 2060 kWh £1,475 £206 £1,681 £19,492 11.6 yrs £14,132
8 kW 8721 kWh 6367 kWh 2355 kWh £1,686 £235 £1,921 £21,526 11.2 yrs £16,901

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: £1,219, 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 2180 kWh 1635 kWh 545 kWh £433 £55 £488 £11,069 22.7 yrs £-1,319
3 kW 3271 kWh 2453 kWh 818 kWh £650 £82 £731 £13,104 17.9 yrs £1,522
4 kW 4361 kWh 3271 kWh 1090 kWh £866 £109 £975 £15,138 15.5 yrs £4,363
5 kW 5451 kWh 4088 kWh 1363 kWh £1,083 £136 £1,219 £17,173 14.1 yrs £7,204
6 kW 6541 kWh 4906 kWh 1635 kWh £1,299 £164 £1,463 £19,207 13.1 yrs £10,044
7 kW 7631 kWh 5723 kWh 1908 kWh £1,516 £191 £1,706 £21,242 12.4 yrs £12,885
8 kW 8721 kWh 6541 kWh 2180 kWh £1,732 £218 £1,950 £23,276 11.9 yrs £15,726

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: £1,237, 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 2180 kWh 1679 kWh 501 kWh £445 £50 £495 £13,519 27.3 yrs £-3,625
3 kW 3271 kWh 2518 kWh 752 kWh £667 £75 £742 £15,554 21.0 yrs £-712
4 kW 4361 kWh 3358 kWh 1003 kWh £889 £100 £989 £17,588 17.8 yrs £2,200
5 kW 5451 kWh 4197 kWh 1254 kWh £1,111 £125 £1,237 £19,623 15.9 yrs £5,113
6 kW 6541 kWh 5037 kWh 1504 kWh £1,334 £150 £1,484 £21,657 14.6 yrs £8,026
7 kW 7631 kWh 5876 kWh 1755 kWh £1,556 £176 £1,731 £23,692 13.7 yrs £10,938
8 kW 8721 kWh 6715 kWh 2006 kWh £1,778 £201 £1,979 £25,726 13.0 yrs £13,851

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 PO6

Figures below are tailored to PO6 — click through for full league tables.

Big-Roof Britain Rank #1226 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #136 of 2997
9.8 years (UK avg 11.3 years)
~£1,039 /yr • £10,173 upfront
Standing-Charge Drag Rank #527 of 2997
15.7% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,039 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1090kWh/kW
A 1 kW system generates ~1090 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: 69% • Flats: 25% • Bungalows: 4% Based on 9,885 properties

Coverage

Portsmouth (100%)

Areas Covered

Cosham, Drayton and Farlington, Paulsgrove, Purbrook

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

PO2 (Portsmouth)
≈3.3 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO6
PO3 (Portsmouth)
≈3.5 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO6
PO7 (Havant)
≈4.8 km away
Local sunshine: ~1,086 kWh/kWp · -0% vs PO6
PO1 (Portsmouth)
≈5.3 km away
Local sunshine: ~1,084 kWh/kWp · -1% vs PO6
PO4 (Portsmouth)
≈6.1 km away
Local sunshine: ~1,084 kWh/kWp · -1% vs PO6
PO5 (Portsmouth)
≈6.3 km away
Local sunshine: ~1,084 kWh/kWp · -1% vs PO6

Similar sunshine across the UK

CT21 (Folkestone and Hythe)
~1,090 kWh/kWp · -0% vs PO6
CT7 (Thanet)
~1,091 kWh/kWp · +0% vs PO6
CT16 (Dover)
~1,089 kWh/kWp · -0% vs PO6