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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in GU35 (East Hampshire)

See if solar pays off for you in East Hampshire — 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
12.4 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£824
What you save every year
Profit Over 25 Years
£10,416
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 993 kWh/kW — 9 below 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 993 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)
993 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: £824, Upfront: £10,173, 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 1985 kWh 794 kWh 1191 kWh £210 £119 £329 £4,069 12.4 yrs £2,519
3 kW 2978 kWh 1191 kWh 1787 kWh £315 £179 £494 £6,104 12.4 yrs £3,779
4 kW 3971 kWh 1588 kWh 2382 kWh £421 £238 £659 £8,138 12.4 yrs £5,039
5 kW 4964 kWh 1985 kWh 2978 kWh £526 £298 £824 £10,173 12.4 yrs £6,298
6 kW 5956 kWh 2382 kWh 3574 kWh £631 £357 £988 £12,207 12.4 yrs £7,558
7 kW 6949 kWh 2780 kWh 4169 kWh £736 £417 £1,153 £14,242 12.4 yrs £8,818
8 kW 7942 kWh 3177 kWh 4765 kWh £841 £476 £1,318 £16,276 12.4 yrs £10,077

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: £987, Upfront: £12,273, 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 1985 kWh 1191 kWh 794 kWh £315 £79 £395 £6,169 15.6 yrs £1,728
3 kW 2978 kWh 1787 kWh 1191 kWh £473 £119 £592 £8,204 13.9 yrs £3,642
4 kW 3971 kWh 2382 kWh 1588 kWh £631 £159 £790 £10,238 13.0 yrs £5,556
5 kW 4964 kWh 2978 kWh 1985 kWh £789 £199 £987 £12,273 12.4 yrs £7,470
6 kW 5956 kWh 3574 kWh 2382 kWh £946 £238 £1,185 £14,307 12.1 yrs £9,384
7 kW 6949 kWh 4169 kWh 2780 kWh £1,104 £278 £1,382 £16,342 11.8 yrs £11,298
8 kW 7942 kWh 4765 kWh 3177 kWh £1,262 £318 £1,579 £18,376 11.6 yrs £13,212

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: £1,069, Upfront: £13,673, 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 1985 kWh 1390 kWh 596 kWh £368 £60 £428 £7,569 17.7 yrs £982
3 kW 2978 kWh 2085 kWh 893 kWh £552 £89 £641 £9,604 15.0 yrs £3,224
4 kW 3971 kWh 2780 kWh 1191 kWh £736 £119 £855 £11,638 13.6 yrs £5,465
5 kW 4964 kWh 3474 kWh 1489 kWh £920 £149 £1,069 £13,673 12.8 yrs £7,706
6 kW 5956 kWh 4169 kWh 1787 kWh £1,104 £179 £1,283 £15,707 12.2 yrs £9,947
7 kW 6949 kWh 4864 kWh 2085 kWh £1,288 £208 £1,497 £17,742 11.9 yrs £12,189
8 kW 7942 kWh 5559 kWh 2382 kWh £1,472 £238 £1,710 £19,776 11.6 yrs £14,430

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: £1,093, Upfront: £15,423, 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 1985 kWh 1449 kWh 536 kWh £384 £54 £437 £9,319 21.3 yrs £-571
3 kW 2978 kWh 2174 kWh 804 kWh £576 £80 £656 £11,354 17.3 yrs £1,768
4 kW 3971 kWh 2899 kWh 1072 kWh £768 £107 £875 £13,388 15.3 yrs £4,108
5 kW 4964 kWh 3623 kWh 1340 kWh £959 £134 £1,093 £15,423 14.1 yrs £6,447
6 kW 5956 kWh 4348 kWh 1608 kWh £1,151 £161 £1,312 £17,457 13.3 yrs £8,786
7 kW 6949 kWh 5073 kWh 1876 kWh £1,343 £188 £1,531 £19,492 12.7 yrs £11,126
8 kW 7942 kWh 5797 kWh 2144 kWh £1,535 £214 £1,750 £21,526 12.3 yrs £13,465

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: £1,110, Upfront: £17,173, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1985 kWh 1489 kWh 496 kWh £394 £50 £444 £11,069 24.9 yrs £-2,190
3 kW 2978 kWh 2234 kWh 745 kWh £591 £74 £666 £13,104 19.7 yrs £215
4 kW 3971 kWh 2978 kWh 993 kWh £789 £99 £888 £15,138 17.0 yrs £2,619
5 kW 4964 kWh 3723 kWh 1241 kWh £986 £124 £1,110 £17,173 15.5 yrs £5,024
6 kW 5956 kWh 4467 kWh 1489 kWh £1,183 £149 £1,332 £19,207 14.4 yrs £7,429
7 kW 6949 kWh 5212 kWh 1737 kWh £1,380 £174 £1,554 £21,242 13.7 yrs £9,834
8 kW 7942 kWh 5956 kWh 1985 kWh £1,577 £199 £1,776 £23,276 13.1 yrs £12,239

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: £1,126, Upfront: £19,623, Break-even: 17.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1985 kWh 1529 kWh 457 kWh £405 £46 £450 £13,519 30.0 yrs £-4,509
3 kW 2978 kWh 2293 kWh 685 kWh £607 £68 £676 £15,554 23.0 yrs £-2,039
4 kW 3971 kWh 3058 kWh 913 kWh £810 £91 £901 £17,588 19.5 yrs £431
5 kW 4964 kWh 3822 kWh 1142 kWh £1,012 £114 £1,126 £19,623 17.4 yrs £2,901
6 kW 5956 kWh 4586 kWh 1370 kWh £1,214 £137 £1,351 £21,657 16.0 yrs £5,372
7 kW 6949 kWh 5351 kWh 1598 kWh £1,417 £160 £1,577 £23,692 15.0 yrs £7,842
8 kW 7942 kWh 6115 kWh 1827 kWh £1,619 £183 £1,802 £25,726 14.3 yrs £10,312

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 GU35

Figures below are tailored to GU35 — click through for full league tables.

Big-Roof Britain Rank #861 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #954 of 2997
10.8 years (UK avg 11.3 years)
~£946 /yr • £10,173 upfront
Standing-Charge Drag Rank #811 of 2997
17.2% (UK avg 21.7%) drag on savings
£163 fixed • ~£946 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
993kWh/kW
A 1 kW system generates ~993 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: 10% Based on 6,820 properties

Coverage

East Hampshire (100%)

Areas Covered

Whitehill Chase, Headley, Whitehill Hogmoor & Greatham, Lindford, Whitehill Pinewood, Binsted, Bentley & Selborne, Grayshott

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

GU30 (East Hampshire)
≈6.2 km away
Local sunshine: ~1,011 kWh/kWp · +2% vs GU35
GU26 (Waverley)
≈7.8 km away
Local sunshine: ~1,005 kWh/kWp · +1% vs GU35
GU33 (East Hampshire)
≈8.5 km away
Local sunshine: ~1,011 kWh/kWp · +2% vs GU35
GU34 (East Hampshire)
≈8.7 km away
Local sunshine: ~1,010 kWh/kWp · +2% vs GU35
GU10 (Waverley)
≈9.7 km away
Local sunshine: ~1,000 kWh/kWp · +1% vs GU35
GU27 (Waverley)
≈10.1 km away
Local sunshine: ~1,020 kWh/kWp · +3% vs GU35

Similar sunshine across the UK

LE14 (Melton)
~993 kWh/kWp · +0% vs GU35
CR4 (Merton)
~993 kWh/kWp · -0% vs GU35
HA5 (Harrow)
~993 kWh/kWp · -0% vs GU35