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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in KT24 (Guildford)

See if solar pays off for you in Guildford — 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
12.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,003
What you save every year
Profit Over 25 Years
£12,872
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 South East, the current unit rate is 26.92p/kWh with a 47.60p/day standing charge. Your postcode’s south-facing sunshine yield is 997 kWh/kW — 32 below the regional median (1029).

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 997 kWh per year on a south-facing roof. We value self-used electricity at 26.9p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.9p/kWh
Standing charge
47.6p/day
Sunshine yield (south)
997 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: £836, Upfront: £10,173, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 798 kWh 1197 kWh £215 £120 £334 £4,069 12.2 yrs £2,619
3 kW 2991 kWh 1197 kWh 1795 kWh £322 £179 £502 £6,104 12.2 yrs £3,928
4 kW 3988 kWh 1595 kWh 2393 kWh £429 £239 £669 £8,138 12.2 yrs £5,237
5 kW 4985 kWh 1994 kWh 2991 kWh £537 £299 £836 £10,173 12.2 yrs £6,547
6 kW 5983 kWh 2393 kWh 3590 kWh £644 £359 £1,003 £12,207 12.2 yrs £7,856
7 kW 6980 kWh 2792 kWh 4188 kWh £752 £419 £1,170 £14,242 12.2 yrs £9,165
8 kW 7977 kWh 3191 kWh 4786 kWh £859 £479 £1,338 £16,276 12.2 yrs £10,475

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: £1,005, Upfront: £12,273, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1197 kWh 798 kWh £322 £80 £402 £6,169 15.4 yrs £1,868
3 kW 2991 kWh 1795 kWh 1197 kWh £483 £120 £603 £8,204 13.6 yrs £3,852
4 kW 3988 kWh 2393 kWh 1595 kWh £644 £160 £804 £10,238 12.7 yrs £5,837
5 kW 4985 kWh 2991 kWh 1994 kWh £805 £199 £1,005 £12,273 12.2 yrs £7,821
6 kW 5983 kWh 3590 kWh 2393 kWh £966 £239 £1,206 £14,307 11.9 yrs £9,805
7 kW 6980 kWh 4188 kWh 2792 kWh £1,127 £279 £1,407 £16,342 11.6 yrs £11,789
8 kW 7977 kWh 4786 kWh 3191 kWh £1,288 £319 £1,607 £18,376 11.4 yrs £13,773

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: £1,089, Upfront: £13,673, 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 1994 kWh 1396 kWh 598 kWh £376 £60 £436 £7,569 17.4 yrs £1,143
3 kW 2991 kWh 2094 kWh 897 kWh £564 £90 £653 £9,604 14.7 yrs £3,465
4 kW 3988 kWh 2792 kWh 1197 kWh £752 £120 £871 £11,638 13.4 yrs £5,786
5 kW 4985 kWh 3490 kWh 1496 kWh £939 £150 £1,089 £13,673 12.6 yrs £8,108
6 kW 5983 kWh 4188 kWh 1795 kWh £1,127 £179 £1,307 £15,707 12.0 yrs £10,429
7 kW 6980 kWh 4886 kWh 2094 kWh £1,315 £209 £1,525 £17,742 11.6 yrs £12,751
8 kW 7977 kWh 5584 kWh 2393 kWh £1,503 £239 £1,742 £19,776 11.3 yrs £15,073

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: £1,114, Upfront: £15,423, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1456 kWh 538 kWh £392 £54 £446 £9,319 20.9 yrs £-404
3 kW 2991 kWh 2184 kWh 808 kWh £588 £81 £669 £11,354 17.0 yrs £2,018
4 kW 3988 kWh 2912 kWh 1077 kWh £784 £108 £891 £13,388 15.0 yrs £4,441
5 kW 4985 kWh 3639 kWh 1346 kWh £980 £135 £1,114 £15,423 13.8 yrs £6,864
6 kW 5983 kWh 4367 kWh 1615 kWh £1,176 £162 £1,337 £17,457 13.1 yrs £9,287
7 kW 6980 kWh 5095 kWh 1885 kWh £1,372 £188 £1,560 £19,492 12.5 yrs £11,710
8 kW 7977 kWh 5823 kWh 2154 kWh £1,568 £215 £1,783 £21,526 12.1 yrs £14,132

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: £1,131, Upfront: £17,173, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1496 kWh 499 kWh £403 £50 £452 £11,069 24.5 yrs £-2,019
3 kW 2991 kWh 2243 kWh 748 kWh £604 £75 £679 £13,104 19.3 yrs £471
4 kW 3988 kWh 2991 kWh 997 kWh £805 £100 £905 £15,138 16.7 yrs £2,961
5 kW 4985 kWh 3739 kWh 1246 kWh £1,007 £125 £1,131 £17,173 15.2 yrs £5,451
6 kW 5983 kWh 4487 kWh 1496 kWh £1,208 £150 £1,357 £19,207 14.1 yrs £7,942
7 kW 6980 kWh 5235 kWh 1745 kWh £1,409 £174 £1,584 £21,242 13.4 yrs £10,432
8 kW 7977 kWh 5983 kWh 1994 kWh £1,610 £199 £1,810 £23,276 12.9 yrs £12,922

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: £1,148, Upfront: £19,623, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1536 kWh 459 kWh £413 £46 £459 £13,519 29.4 yrs £-4,334
3 kW 2991 kWh 2303 kWh 688 kWh £620 £69 £689 £15,554 22.6 yrs £-1,777
4 kW 3988 kWh 3071 kWh 917 kWh £827 £92 £918 £17,588 19.1 yrs £781
5 kW 4985 kWh 3839 kWh 1147 kWh £1,033 £115 £1,148 £19,623 17.1 yrs £3,339
6 kW 5983 kWh 4607 kWh 1376 kWh £1,240 £138 £1,378 £21,657 15.7 yrs £5,897
7 kW 6980 kWh 5374 kWh 1605 kWh £1,447 £161 £1,607 £23,692 14.7 yrs £8,454
8 kW 7977 kWh 6142 kWh 1835 kWh £1,653 £183 £1,837 £25,726 14.0 yrs £11,012

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 KT24

Figures below are tailored to KT24 — click through for full league tables.

Big-Roof Britain Rank #11 of 2182
7.8 kWp (UK avg 5.1 kWp)
~16 panels (≈430 W)
Solar Payback Index Rank #659 of 2997
10.6 years (UK avg 11.3 years)
~£1,155 /yr • £12,207 upfront
Standing-Charge Drag Rank #253 of 2997
15.0% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,155 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
997kWh/kW
A 1 kW system generates ~997 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: 72% • Flats: 12% • Bungalows: 14% Based on 2,299 properties

Coverage

Guildford (100%)

Areas Covered

Clandon & Horsley, Effingham, Send & Lovelace, Tillingbourne

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 South East

KT23 (Mole Valley)
≈4.3 km away
Local sunshine: ~1,002 kWh/kWp · +0% vs KT24
GU23 (Guildford)
≈6.3 km away
Local sunshine: ~997 kWh/kWp · -0% vs KT24
KT11 (Elmbridge)
≈7.1 km away
Local sunshine: ~997 kWh/kWp · +0% vs KT24
KT22 (Mole Valley)
≈7.6 km away
Local sunshine: ~989 kWh/kWp · -1% vs KT24
RH4 (Mole Valley)
≈8.0 km away
Local sunshine: ~1,012 kWh/kWp · +2% vs KT24
GU4 (Guildford)
≈8.2 km away
Local sunshine: ~987 kWh/kWp · -1% vs KT24

Similar sunshine across the UK

HU11 (East Riding of Yorkshire)
~997 kWh/kWp · -0% vs KT24
RG22 (Basingstoke and Deane)
~997 kWh/kWp · +0% vs KT24
RG17 (West Berkshire)
~997 kWh/kWp · -0% vs KT24