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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in GU7 (Waverley)

See if solar pays off for you in Waverley — 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
12.5 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£813
What you save every year
Profit Over 25 Years
£10,147
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 980 kWh/kW — 22 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 980 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)
980 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: £813, Upfront: £10,173, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 784 kWh 1176 kWh £208 £118 £325 £4,069 12.5 yrs £2,433
3 kW 2939 kWh 1176 kWh 1763 kWh £311 £176 £488 £6,104 12.5 yrs £3,650
4 kW 3919 kWh 1568 kWh 2351 kWh £415 £235 £650 £8,138 12.5 yrs £4,866
5 kW 4899 kWh 1959 kWh 2939 kWh £519 £294 £813 £10,173 12.5 yrs £6,083
6 kW 5878 kWh 2351 kWh 3527 kWh £623 £353 £975 £12,207 12.5 yrs £7,299
7 kW 6858 kWh 2743 kWh 4115 kWh £726 £411 £1,138 £14,242 12.5 yrs £8,516
8 kW 7838 kWh 3135 kWh 4703 kWh £830 £470 £1,300 £16,276 12.5 yrs £9,732

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: £974, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1176 kWh 784 kWh £311 £78 £390 £6,169 15.8 yrs £1,625
3 kW 2939 kWh 1763 kWh 1176 kWh £467 £118 £585 £8,204 14.0 yrs £3,487
4 kW 3919 kWh 2351 kWh 1568 kWh £623 £157 £779 £10,238 13.1 yrs £5,350
5 kW 4899 kWh 2939 kWh 1959 kWh £778 £196 £974 £12,273 12.6 yrs £7,212
6 kW 5878 kWh 3527 kWh 2351 kWh £934 £235 £1,169 £14,307 12.2 yrs £9,074
7 kW 6858 kWh 4115 kWh 2743 kWh £1,090 £274 £1,364 £16,342 12.0 yrs £10,937
8 kW 7838 kWh 4703 kWh 3135 kWh £1,245 £314 £1,559 £18,376 11.8 yrs £12,799

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: £1,055, Upfront: £13,673, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1372 kWh 588 kWh £363 £59 £422 £7,569 17.9 yrs £871
3 kW 2939 kWh 2057 kWh 882 kWh £545 £88 £633 £9,604 15.2 yrs £3,056
4 kW 3919 kWh 2743 kWh 1176 kWh £726 £118 £844 £11,638 13.8 yrs £5,241
5 kW 4899 kWh 3429 kWh 1470 kWh £908 £147 £1,055 £13,673 13.0 yrs £7,426
6 kW 5878 kWh 4115 kWh 1763 kWh £1,090 £176 £1,266 £15,707 12.4 yrs £9,612
7 kW 6858 kWh 4801 kWh 2057 kWh £1,271 £206 £1,477 £17,742 12.0 yrs £11,797
8 kW 7838 kWh 5486 kWh 2351 kWh £1,453 £235 £1,688 £19,776 11.7 yrs £13,982

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: £1,079, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1430 kWh 529 kWh £379 £53 £432 £9,319 21.6 yrs £-686
3 kW 2939 kWh 2146 kWh 794 kWh £568 £79 £648 £11,354 17.5 yrs £1,597
4 kW 3919 kWh 2861 kWh 1058 kWh £758 £106 £863 £13,388 15.5 yrs £3,879
5 kW 4899 kWh 3576 kWh 1323 kWh £947 £132 £1,079 £15,423 14.3 yrs £6,161
6 kW 5878 kWh 4291 kWh 1587 kWh £1,136 £159 £1,295 £17,457 13.5 yrs £8,443
7 kW 6858 kWh 5006 kWh 1852 kWh £1,326 £185 £1,511 £19,492 12.9 yrs £10,725
8 kW 7838 kWh 5722 kWh 2116 kWh £1,515 £212 £1,727 £21,526 12.5 yrs £13,007

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: £1,095, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1470 kWh 490 kWh £389 £49 £438 £11,069 25.3 yrs £-2,306
3 kW 2939 kWh 2204 kWh 735 kWh £584 £73 £657 £13,104 19.9 yrs £40
4 kW 3919 kWh 2939 kWh 980 kWh £778 £98 £876 £15,138 17.3 yrs £2,387
5 kW 4899 kWh 3674 kWh 1225 kWh £973 £122 £1,095 £17,173 15.7 yrs £4,734
6 kW 5878 kWh 4409 kWh 1470 kWh £1,167 £147 £1,314 £19,207 14.6 yrs £7,081
7 kW 6858 kWh 5143 kWh 1714 kWh £1,362 £171 £1,533 £21,242 13.9 yrs £9,427
8 kW 7838 kWh 5878 kWh 1959 kWh £1,557 £196 £1,753 £23,276 13.3 yrs £11,774

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: £1,111, Upfront: £19,623, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1509 kWh 451 kWh £400 £45 £445 £13,519 30.4 yrs £-4,627
3 kW 2939 kWh 2263 kWh 676 kWh £599 £68 £667 £15,554 23.3 yrs £-2,216
4 kW 3919 kWh 3018 kWh 901 kWh £799 £90 £889 £17,588 19.8 yrs £195
5 kW 4899 kWh 3772 kWh 1127 kWh £999 £113 £1,111 £19,623 17.7 yrs £2,607
6 kW 5878 kWh 4526 kWh 1352 kWh £1,199 £135 £1,334 £21,657 16.2 yrs £5,018
7 kW 6858 kWh 5281 kWh 1577 kWh £1,398 £158 £1,556 £23,692 15.2 yrs £7,429
8 kW 7838 kWh 6035 kWh 1803 kWh £1,598 £180 £1,778 £25,726 14.5 yrs £9,841

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 GU7

Figures below are tailored to GU7 — click through for full league tables.

Big-Roof Britain Rank #1427 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1126 of 2997
10.9 years (UK avg 11.3 years)
~£934 /yr • £10,173 upfront
Standing-Charge Drag Rank #858 of 2997
17.4% (UK avg 21.7%) drag on savings
£163 fixed • ~£934 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
980kWh/kW
A 1 kW system generates ~980 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: 61% • Flats: 30% • Bungalows: 6% Based on 6,805 properties

Coverage

Waverley (97%)|Guildford (3%)

Areas Covered

Godalming Central & Ockford, Godalming Binscombe & Charterhouse, Godalming Farncombe & Catteshall, Godalming Holloway, Bramley & Wonersh, Pilgrims, Shalford

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

GU8 (Waverley)
≈4.4 km away
Local sunshine: ~1,011 kWh/kWp · +3% vs GU7
GU12 (Guildford)
≈11.0 km away
Local sunshine: ~1,000 kWh/kWp · +2% vs GU7
GU11 (Rushmoor)
≈12.8 km away
Local sunshine: ~993 kWh/kWp · +1% vs GU7
GU26 (Waverley)
≈12.9 km away
Local sunshine: ~1,005 kWh/kWp · +3% vs GU7
GU10 (Waverley)
≈13.6 km away
Local sunshine: ~1,000 kWh/kWp · +2% vs GU7
GU9 (Waverley)
≈13.9 km away
Local sunshine: ~991 kWh/kWp · +1% vs GU7

Similar sunshine across the UK

LN10 (East Lindsey)
~980 kWh/kWp · -0% vs GU7
HP23 (Dacorum)
~980 kWh/kWp · -0% vs GU7
SA63 (Pembrokeshire)
~979 kWh/kWp · -0% vs GU7