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Solar panel cost in Portsmouth (PO4)

See realistic solar installation costs, savings and payback for PO4 (Portsmouth) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
11.0 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£929
What you save every year
Profit Over 25 Years
£13,041
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 27.83p/kWh with a 45.70p/day standing charge. Your postcode’s south-facing sunshine yield is 1084 kWh/kW — 83 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 1084 kWh per year on a south-facing roof. We value self-used electricity at 27.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.8p/kWh
Standing charge
45.7p/day
Sunshine yield (south)
1084 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: £929, Upfront: £10,173, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2168 kWh 867 kWh 1301 kWh £241 £130 £371 £4,069 11.0 yrs £3,359
3 kW 3252 kWh 1301 kWh 1951 kWh £362 £195 £557 £6,104 11.0 yrs £5,039
4 kW 4336 kWh 1734 kWh 2602 kWh £483 £260 £743 £8,138 11.0 yrs £6,719
5 kW 5420 kWh 2168 kWh 3252 kWh £603 £325 £929 £10,173 11.0 yrs £8,399
6 kW 6504 kWh 2602 kWh 3902 kWh £724 £390 £1,114 £12,207 11.0 yrs £10,078
7 kW 7588 kWh 3035 kWh 4553 kWh £845 £455 £1,300 £14,242 11.0 yrs £11,758
8 kW 8672 kWh 3469 kWh 5203 kWh £965 £520 £1,486 £16,276 11.0 yrs £13,438

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: £1,122, 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 2168 kWh 1301 kWh 867 kWh £362 £87 £449 £6,169 13.7 yrs £2,806
3 kW 3252 kWh 1951 kWh 1301 kWh £543 £130 £673 £8,204 12.2 yrs £5,258
4 kW 4336 kWh 2602 kWh 1734 kWh £724 £173 £897 £10,238 11.4 yrs £7,711
5 kW 5420 kWh 3252 kWh 2168 kWh £905 £217 £1,122 £12,273 10.9 yrs £10,164
6 kW 6504 kWh 3902 kWh 2602 kWh £1,086 £260 £1,346 £14,307 10.6 yrs £12,617
7 kW 7588 kWh 4553 kWh 3035 kWh £1,267 £304 £1,571 £16,342 10.4 yrs £15,070
8 kW 8672 kWh 5203 kWh 3469 kWh £1,448 £347 £1,795 £18,376 10.2 yrs £17,523

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: £1,218, 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 2168 kWh 1518 kWh 650 kWh £422 £65 £487 £7,569 15.5 yrs £2,179
3 kW 3252 kWh 2276 kWh 976 kWh £634 £98 £731 £9,604 13.1 yrs £5,018
4 kW 4336 kWh 3035 kWh 1301 kWh £845 £130 £975 £11,638 11.9 yrs £7,857
5 kW 5420 kWh 3794 kWh 1626 kWh £1,056 £163 £1,218 £13,673 11.2 yrs £10,697
6 kW 6504 kWh 4553 kWh 1951 kWh £1,267 £195 £1,462 £15,707 10.7 yrs £13,536
7 kW 7588 kWh 5312 kWh 2276 kWh £1,478 £228 £1,706 £17,742 10.4 yrs £16,376
8 kW 8672 kWh 6070 kWh 2602 kWh £1,689 £260 £1,950 £19,776 10.1 yrs £19,215

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 2168 kWh 1583 kWh 585 kWh £440 £59 £499 £9,319 18.7 yrs £661
3 kW 3252 kWh 2374 kWh 878 kWh £661 £88 £748 £11,354 15.2 yrs £3,616
4 kW 4336 kWh 3165 kWh 1171 kWh £881 £117 £998 £13,388 13.4 yrs £6,571
5 kW 5420 kWh 3957 kWh 1463 kWh £1,101 £146 £1,247 £15,423 12.4 yrs £9,527
6 kW 6504 kWh 4748 kWh 1756 kWh £1,321 £176 £1,497 £17,457 11.7 yrs £12,482
7 kW 7588 kWh 5539 kWh 2049 kWh £1,542 £205 £1,746 £19,492 11.2 yrs £15,437
8 kW 8672 kWh 6331 kWh 2341 kWh £1,762 £234 £1,996 £21,526 10.8 yrs £18,393

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: £1,267, 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 2168 kWh 1626 kWh 542 kWh £453 £54 £507 £11,069 21.8 yrs £-935
3 kW 3252 kWh 2439 kWh 813 kWh £679 £81 £760 £13,104 17.2 yrs £2,098
4 kW 4336 kWh 3252 kWh 1084 kWh £905 £108 £1,013 £15,138 14.9 yrs £5,131
5 kW 5420 kWh 4065 kWh 1355 kWh £1,131 £136 £1,267 £17,173 13.6 yrs £8,163
6 kW 6504 kWh 4878 kWh 1626 kWh £1,358 £163 £1,520 £19,207 12.6 yrs £11,196
7 kW 7588 kWh 5691 kWh 1897 kWh £1,584 £190 £1,774 £21,242 12.0 yrs £14,229
8 kW 8672 kWh 6504 kWh 2168 kWh £1,810 £217 £2,027 £23,276 11.5 yrs £17,261

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: £1,286, 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 2168 kWh 1669 kWh 499 kWh £465 £50 £514 £13,519 26.3 yrs £-3,230
3 kW 3252 kWh 2504 kWh 748 kWh £697 £75 £772 £15,554 20.2 yrs £-120
4 kW 4336 kWh 3339 kWh 997 kWh £929 £100 £1,029 £17,588 17.1 yrs £2,990
5 kW 5420 kWh 4173 kWh 1247 kWh £1,161 £125 £1,286 £19,623 15.3 yrs £6,100
6 kW 6504 kWh 5008 kWh 1496 kWh £1,394 £150 £1,543 £21,657 14.0 yrs £9,210
7 kW 7588 kWh 5843 kWh 1745 kWh £1,626 £175 £1,801 £23,692 13.2 yrs £12,320
8 kW 8672 kWh 6677 kWh 1995 kWh £1,858 £199 £2,058 £25,726 12.5 yrs £15,430

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 PO4

Figures below are tailored to PO4 — click through for full league tables.

Big-Roof Britain Rank #1746 of 2182
4.5 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #152 of 2997
11.0 years (UK avg 12.6 years)
~£929 /yr • £10,173 upfront
Standing-Charge Drag Rank #540 of 2997
18.0% (UK avg 24.6%) drag on savings
£167 fixed • ~£929 /yr value
Aspect Penalty View ranking →
East −20.8% West −22.2%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
27.83p/kWh
Daily Fixed Charge
45.70p/day
Local Sunshine
1084kWh/kW
A 1 kW system generates ~1084 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: 32% • Bungalows: 0% Based on 12,451 properties

Coverage

Portsmouth (100%)

Areas Covered

Milton, Eastney and Craneswater, Central Southsea, Charles Dickens, Baffins

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q1 2026

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

PO5 (Portsmouth)
≈1.6 km away
Local sunshine: ~1,084 kWh/kWp · +0% vs PO4
PO1 (Portsmouth)
≈2.0 km away
Local sunshine: ~1,084 kWh/kWp · +0% vs PO4
PO3 (Portsmouth)
≈2.6 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO4
PO2 (Portsmouth)
≈3.0 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO4
PO12 (Gosport)
≈5.8 km away
Local sunshine: ~1,072 kWh/kWp · -1% vs PO4
PO11 (Havant)
≈5.8 km away
Local sunshine: ~1,096 kWh/kWp · +1% vs PO4

Similar sunshine across the UK

BN6 (Mid Sussex)
~1,084 kWh/kWp · +0% vs PO4
TR19 (Cornwall)
~1,083 kWh/kWp · -0% vs PO4
SS5 (Rochford)
~1,083 kWh/kWp · -0% vs PO4