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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in RH8 (Tandridge)

See if solar pays off for you in Tandridge — 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
12.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,012
What you save every year
Profit Over 25 Years
£13,089
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 1006 kWh/kW — 23 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 1006 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)
1006 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: £843, Upfront: £10,173, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2011 kWh 805 kWh 1207 kWh £217 £121 £337 £4,069 12.1 yrs £2,677
3 kW 3017 kWh 1207 kWh 1810 kWh £325 £181 £506 £6,104 12.1 yrs £4,015
4 kW 4023 kWh 1609 kWh 2414 kWh £433 £241 £675 £8,138 12.1 yrs £5,353
5 kW 5029 kWh 2011 kWh 3017 kWh £541 £302 £843 £10,173 12.1 yrs £6,692
6 kW 6034 kWh 2414 kWh 3621 kWh £650 £362 £1,012 £12,207 12.1 yrs £8,030
7 kW 7040 kWh 2816 kWh 4224 kWh £758 £422 £1,180 £14,242 12.1 yrs £9,368
8 kW 8046 kWh 3218 kWh 4828 kWh £866 £483 £1,349 £16,276 12.1 yrs £10,706

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: £1,013, Upfront: £12,273, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2011 kWh 1207 kWh 805 kWh £325 £80 £405 £6,169 15.2 yrs £1,938
3 kW 3017 kWh 1810 kWh 1207 kWh £487 £121 £608 £8,204 13.5 yrs £3,957
4 kW 4023 kWh 2414 kWh 1609 kWh £650 £161 £811 £10,238 12.6 yrs £5,976
5 kW 5029 kWh 3017 kWh 2011 kWh £812 £201 £1,013 £12,273 12.1 yrs £7,995
6 kW 6034 kWh 3621 kWh 2414 kWh £975 £241 £1,216 £14,307 11.8 yrs £10,014
7 kW 7040 kWh 4224 kWh 2816 kWh £1,137 £282 £1,419 £16,342 11.5 yrs £12,033
8 kW 8046 kWh 4828 kWh 3218 kWh £1,300 £322 £1,621 £18,376 11.3 yrs £14,052

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: £1,098, Upfront: £13,673, 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 2011 kWh 1408 kWh 603 kWh £379 £60 £439 £7,569 17.2 yrs £1,219
3 kW 3017 kWh 2112 kWh 905 kWh £569 £91 £659 £9,604 14.6 yrs £3,578
4 kW 4023 kWh 2816 kWh 1207 kWh £758 £121 £879 £11,638 13.2 yrs £5,937
5 kW 5029 kWh 3520 kWh 1509 kWh £948 £151 £1,098 £13,673 12.4 yrs £8,297
6 kW 6034 kWh 4224 kWh 1810 kWh £1,137 £181 £1,318 £15,707 11.9 yrs £10,656
7 kW 7040 kWh 4928 kWh 2112 kWh £1,327 £211 £1,538 £17,742 11.5 yrs £13,015
8 kW 8046 kWh 5632 kWh 2414 kWh £1,516 £241 £1,758 £19,776 11.3 yrs £15,375

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: £1,124, Upfront: £15,423, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2011 kWh 1468 kWh 543 kWh £395 £54 £450 £9,319 20.7 yrs £-327
3 kW 3017 kWh 2203 kWh 815 kWh £593 £81 £674 £11,354 16.8 yrs £2,134
4 kW 4023 kWh 2937 kWh 1086 kWh £791 £109 £899 £13,388 14.9 yrs £4,596
5 kW 5029 kWh 3671 kWh 1358 kWh £988 £136 £1,124 £15,423 13.7 yrs £7,057
6 kW 6034 kWh 4405 kWh 1629 kWh £1,186 £163 £1,349 £17,457 12.9 yrs £9,519
7 kW 7040 kWh 5139 kWh 1901 kWh £1,383 £190 £1,574 £19,492 12.4 yrs £11,980
8 kW 8046 kWh 5873 kWh 2172 kWh £1,581 £217 £1,798 £21,526 12.0 yrs £14,441

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: £1,141, Upfront: £17,173, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2011 kWh 1509 kWh 503 kWh £406 £50 £456 £11,069 24.3 yrs £-1,941
3 kW 3017 kWh 2263 kWh 754 kWh £609 £75 £685 £13,104 19.1 yrs £588
4 kW 4023 kWh 3017 kWh 1006 kWh £812 £101 £913 £15,138 16.6 yrs £3,118
5 kW 5029 kWh 3771 kWh 1257 kWh £1,015 £126 £1,141 £17,173 15.1 yrs £5,647
6 kW 6034 kWh 4526 kWh 1509 kWh £1,218 £151 £1,369 £19,207 14.0 yrs £8,177
7 kW 7040 kWh 5280 kWh 1760 kWh £1,421 £176 £1,597 £21,242 13.3 yrs £10,706
8 kW 8046 kWh 6034 kWh 2011 kWh £1,624 £201 £1,826 £23,276 12.7 yrs £13,236

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: £1,158, Upfront: £19,623, Break-even: 16.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2011 kWh 1549 kWh 463 kWh £417 £46 £463 £13,519 29.2 yrs £-4,255
3 kW 3017 kWh 2323 kWh 694 kWh £625 £69 £695 £15,554 22.4 yrs £-1,657
4 kW 4023 kWh 3098 kWh 925 kWh £834 £93 £926 £17,588 19.0 yrs £940
5 kW 5029 kWh 3872 kWh 1157 kWh £1,042 £116 £1,158 £19,623 16.9 yrs £3,538
6 kW 6034 kWh 4646 kWh 1388 kWh £1,251 £139 £1,390 £21,657 15.6 yrs £6,135
7 kW 7040 kWh 5421 kWh 1619 kWh £1,459 £162 £1,621 £23,692 14.6 yrs £8,733
8 kW 8046 kWh 6195 kWh 1851 kWh £1,668 £185 £1,853 £25,726 13.9 yrs £11,330

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 RH8

Figures below are tailored to RH8 — click through for full league tables.

Big-Roof Britain Rank #574 of 2182
5.5 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #554 of 2997
10.5 years (UK avg 11.3 years)
~£1,165 /yr • £12,207 upfront
Standing-Charge Drag Rank #240 of 2997
14.9% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,165 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1006kWh/kW
A 1 kW system generates ~1006 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: 68% • Flats: 26% • Bungalows: 4% Based on 3,611 properties

Coverage

Tandridge (100%)

Areas Covered

Oxted North, Limpsfield, Oxted South, Lingfield, Crowhurst & Tandridge, Tatsfield & Titsey

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

RH9 (Tandridge)
≈4.6 km away
Local sunshine: ~1,003 kWh/kWp · -0% vs RH8
TN16 (Bromley)
≈6.2 km away
Local sunshine: ~1,009 kWh/kWp · +0% vs RH8
CR6 (Tandridge)
≈6.8 km away
Local sunshine: ~998 kWh/kWp · -1% vs RH8
CR3 (Tandridge)
≈7.2 km away
Local sunshine: ~986 kWh/kWp · -2% vs RH8
TN8 (Sevenoaks)
≈8.2 km away
Local sunshine: ~1,024 kWh/kWp · +2% vs RH8
RH7 (Tandridge)
≈9.3 km away
Local sunshine: ~1,014 kWh/kWp · +1% vs RH8

Similar sunshine across the UK

SE10 (Greenwich)
~1,006 kWh/kWp · +0% vs RH8
SA15 (Carmarthenshire)
~1,006 kWh/kWp · -0% vs RH8
SE7 (Greenwich)
~1,006 kWh/kWp · -0% vs RH8