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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SO42 (New Forest)

See if solar pays off for you in New Forest — 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
11.5 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,063
What you save every year
Profit Over 25 Years
£14,365
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 1068 kWh/kW — 66 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 1068 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)
1068 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: £886, Upfront: £10,173, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2135 kWh 854 kWh 1281 kWh £226 £128 £354 £4,069 11.5 yrs £3,017
3 kW 3203 kWh 1281 kWh 1922 kWh £339 £192 £531 £6,104 11.5 yrs £4,525
4 kW 4271 kWh 1708 kWh 2562 kWh £452 £256 £709 £8,138 11.5 yrs £6,034
5 kW 5338 kWh 2135 kWh 3203 kWh £565 £320 £886 £10,173 11.5 yrs £7,542
6 kW 6406 kWh 2562 kWh 3844 kWh £679 £384 £1,063 £12,207 11.5 yrs £9,050
7 kW 7474 kWh 2989 kWh 4484 kWh £792 £448 £1,240 £14,242 11.5 yrs £10,559
8 kW 8541 kWh 3417 kWh 5125 kWh £905 £512 £1,417 £16,276 11.5 yrs £12,067

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: £1,062, Upfront: £12,273, 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 2135 kWh 1281 kWh 854 kWh £339 £85 £425 £6,169 14.5 yrs £2,324
3 kW 3203 kWh 1922 kWh 1281 kWh £509 £128 £637 £8,204 12.9 yrs £4,537
4 kW 4271 kWh 2562 kWh 1708 kWh £679 £171 £849 £10,238 12.1 yrs £6,749
5 kW 5338 kWh 3203 kWh 2135 kWh £848 £214 £1,062 £12,273 11.6 yrs £8,961
6 kW 6406 kWh 3844 kWh 2562 kWh £1,018 £256 £1,274 £14,307 11.2 yrs £11,173
7 kW 7474 kWh 4484 kWh 2989 kWh £1,187 £299 £1,486 £16,342 11.0 yrs £13,386
8 kW 8541 kWh 5125 kWh 3417 kWh £1,357 £342 £1,699 £18,376 10.8 yrs £15,598

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: £1,150, Upfront: £13,673, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2135 kWh 1495 kWh 641 kWh £396 £64 £460 £7,569 16.5 yrs £1,628
3 kW 3203 kWh 2242 kWh 961 kWh £594 £96 £690 £9,604 13.9 yrs £4,192
4 kW 4271 kWh 2989 kWh 1281 kWh £792 £128 £920 £11,638 12.7 yrs £6,756
5 kW 5338 kWh 3737 kWh 1601 kWh £990 £160 £1,150 £13,673 11.9 yrs £9,321
6 kW 6406 kWh 4484 kWh 1922 kWh £1,187 £192 £1,380 £15,707 11.4 yrs £11,885
7 kW 7474 kWh 5232 kWh 2242 kWh £1,385 £224 £1,610 £17,742 11.0 yrs £14,449
8 kW 8541 kWh 5979 kWh 2562 kWh £1,583 £256 £1,839 £19,776 10.8 yrs £17,013

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: £1,176, Upfront: £15,423, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2135 kWh 1559 kWh 577 kWh £413 £58 £470 £9,319 19.8 yrs £89
3 kW 3203 kWh 2338 kWh 865 kWh £619 £86 £706 £11,354 16.1 yrs £2,759
4 kW 4271 kWh 3118 kWh 1153 kWh £826 £115 £941 £13,388 14.2 yrs £5,429
5 kW 5338 kWh 3897 kWh 1441 kWh £1,032 £144 £1,176 £15,423 13.1 yrs £8,098
6 kW 6406 kWh 4676 kWh 1730 kWh £1,238 £173 £1,411 £17,457 12.4 yrs £10,768
7 kW 7474 kWh 5456 kWh 2018 kWh £1,445 £202 £1,646 £19,492 11.8 yrs £13,438
8 kW 8541 kWh 6235 kWh 2306 kWh £1,651 £231 £1,882 £21,526 11.4 yrs £16,107

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: £1,194, Upfront: £17,173, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2135 kWh 1601 kWh 534 kWh £424 £53 £477 £11,069 23.2 yrs £-1,520
3 kW 3203 kWh 2402 kWh 801 kWh £636 £80 £716 £13,104 18.3 yrs £1,220
4 kW 4271 kWh 3203 kWh 1068 kWh £848 £107 £955 £15,138 15.9 yrs £3,960
5 kW 5338 kWh 4004 kWh 1335 kWh £1,060 £133 £1,194 £17,173 14.4 yrs £6,700
6 kW 6406 kWh 4804 kWh 1601 kWh £1,272 £160 £1,432 £19,207 13.4 yrs £9,440
7 kW 7474 kWh 5605 kWh 1868 kWh £1,484 £187 £1,671 £21,242 12.7 yrs £12,180
8 kW 8541 kWh 6406 kWh 2135 kWh £1,696 £214 £1,910 £23,276 12.2 yrs £14,921

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: £1,211, Upfront: £19,623, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2135 kWh 1644 kWh 491 kWh £435 £49 £484 £13,519 27.9 yrs £-3,829
3 kW 3203 kWh 2466 kWh 737 kWh £653 £74 £727 £15,554 21.4 yrs £-1,019
4 kW 4271 kWh 3288 kWh 982 kWh £871 £98 £969 £17,588 18.2 yrs £1,792
5 kW 5338 kWh 4110 kWh 1228 kWh £1,088 £123 £1,211 £19,623 16.2 yrs £4,602
6 kW 6406 kWh 4933 kWh 1473 kWh £1,306 £147 £1,453 £21,657 14.9 yrs £7,413
7 kW 7474 kWh 5755 kWh 1719 kWh £1,524 £172 £1,696 £23,692 14.0 yrs £10,223
8 kW 8541 kWh 6577 kWh 1964 kWh £1,742 £196 £1,938 £25,726 13.3 yrs £13,034

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 SO42

Figures below are tailored to SO42 — click through for full league tables.

Big-Roof Britain Rank #177 of 2182
6.2 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #195 of 2997
10.0 years (UK avg 11.3 years)
~£1,221 /yr • £12,207 upfront
Standing-Charge Drag Rank #34 of 2997
13.3% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,221 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1068kWh/kW
A 1 kW system generates ~1068 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: 73% • Flats: 12% • Bungalows: 12% Based on 1,561 properties

Coverage

New Forest (100%)

Areas Covered

Brockenhurst & Denny Lodge, Forest & Solent, Lymington

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

SO4 (New Forest)
≈6.1 km away
Local sunshine: ~1,107 kWh/kWp · +4% vs SO42
SO43 (New Forest)
≈6.7 km away
Local sunshine: ~1,036 kWh/kWp · -3% vs SO42
SO41 (New Forest)
≈6.8 km away
Local sunshine: ~1,106 kWh/kWp · +4% vs SO42
BH25 (New Forest)
≈9.5 km away
Local sunshine: ~1,106 kWh/kWp · +4% vs SO42
SO40 (New Forest)
≈12.1 km away
Local sunshine: ~1,035 kWh/kWp · -3% vs SO42
SO45 (New Forest)
≈12.7 km away
Local sunshine: ~1,052 kWh/kWp · -1% vs SO42

Similar sunshine across the UK

IP10 (East Suffolk)
~1,068 kWh/kWp · +0% vs SO42
BN45 (Mid Sussex)
~1,068 kWh/kWp · +0% vs SO42
TR27 (Cornwall)
~1,067 kWh/kWp · -0% vs SO42