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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in RM20 (Thurrock)

See if solar pays off for you in Thurrock — 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
12.0 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£680
What you save every year
Profit Over 25 Years
£8,861
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 Eastern, the current unit rate is 26.53p/kWh with a 48.25p/day standing charge. Your postcode’s south-facing sunshine yield is 1023 kWh/kW — 14 above the regional median (1009).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1023 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
48.2p/day
Sunshine yield (south)
1023 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: £850, Upfront: £10,173, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2047 kWh 819 kWh 1228 kWh £217 £123 £340 £4,069 12.0 yrs £2,730
3 kW 3070 kWh 1228 kWh 1842 kWh £326 £184 £510 £6,104 12.0 yrs £4,096
4 kW 4093 kWh 1637 kWh 2456 kWh £434 £246 £680 £8,138 12.0 yrs £5,461
5 kW 5116 kWh 2047 kWh 3070 kWh £543 £307 £850 £10,173 12.0 yrs £6,826
6 kW 6140 kWh 2456 kWh 3684 kWh £652 £368 £1,020 £12,207 12.0 yrs £8,191
7 kW 7163 kWh 2865 kWh 4298 kWh £760 £430 £1,190 £14,242 12.0 yrs £9,556
8 kW 8186 kWh 3274 kWh 4912 kWh £869 £491 £1,360 £16,276 12.0 yrs £10,922

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: £1,019, Upfront: £12,273, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2047 kWh 1228 kWh 819 kWh £326 £82 £408 £6,169 15.1 yrs £1,984
3 kW 3070 kWh 1842 kWh 1228 kWh £489 £123 £611 £8,204 13.4 yrs £4,025
4 kW 4093 kWh 2456 kWh 1637 kWh £652 £164 £815 £10,238 12.6 yrs £6,067
5 kW 5116 kWh 3070 kWh 2047 kWh £814 £205 £1,019 £12,273 12.0 yrs £8,109
6 kW 6140 kWh 3684 kWh 2456 kWh £977 £246 £1,223 £14,307 11.7 yrs £10,151
7 kW 7163 kWh 4298 kWh 2865 kWh £1,140 £287 £1,427 £16,342 11.5 yrs £12,193
8 kW 8186 kWh 4912 kWh 3274 kWh £1,303 £327 £1,631 £18,376 11.3 yrs £14,234

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: £1,104, 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 2047 kWh 1433 kWh 614 kWh £380 £61 £441 £7,569 17.1 yrs £1,260
3 kW 3070 kWh 2149 kWh 921 kWh £570 £92 £662 £9,604 14.5 yrs £3,640
4 kW 4093 kWh 2865 kWh 1228 kWh £760 £123 £883 £11,638 13.2 yrs £6,020
5 kW 5116 kWh 3581 kWh 1535 kWh £950 £153 £1,104 £13,673 12.4 yrs £8,400
6 kW 6140 kWh 4298 kWh 1842 kWh £1,140 £184 £1,324 £15,707 11.9 yrs £10,780
7 kW 7163 kWh 5014 kWh 2149 kWh £1,330 £215 £1,545 £17,742 11.5 yrs £13,161
8 kW 8186 kWh 5730 kWh 2456 kWh £1,520 £246 £1,766 £19,776 11.2 yrs £15,541

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: £1,129, 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 2047 kWh 1494 kWh 553 kWh £396 £55 £452 £9,319 20.6 yrs £-287
3 kW 3070 kWh 2241 kWh 829 kWh £595 £83 £677 £11,354 16.8 yrs £2,195
4 kW 4093 kWh 2988 kWh 1105 kWh £793 £111 £903 £13,388 14.8 yrs £4,676
5 kW 5116 kWh 3735 kWh 1381 kWh £991 £138 £1,129 £15,423 13.7 yrs £7,158
6 kW 6140 kWh 4482 kWh 1658 kWh £1,189 £166 £1,355 £17,457 12.9 yrs £9,639
7 kW 7163 kWh 5229 kWh 1934 kWh £1,387 £193 £1,581 £19,492 12.3 yrs £12,121
8 kW 8186 kWh 5976 kWh 2210 kWh £1,585 £221 £1,806 £21,526 11.9 yrs £14,603

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: £1,146, Upfront: £17,173, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2047 kWh 1535 kWh 512 kWh £407 £51 £458 £11,069 24.1 yrs £-1,902
3 kW 3070 kWh 2302 kWh 767 kWh £611 £77 £688 £13,104 19.1 yrs £648
4 kW 4093 kWh 3070 kWh 1023 kWh £814 £102 £917 £15,138 16.5 yrs £3,197
5 kW 5116 kWh 3837 kWh 1279 kWh £1,018 £128 £1,146 £17,173 15.0 yrs £5,746
6 kW 6140 kWh 4605 kWh 1535 kWh £1,222 £153 £1,375 £19,207 14.0 yrs £8,295
7 kW 7163 kWh 5372 kWh 1791 kWh £1,425 £179 £1,604 £21,242 13.2 yrs £10,845
8 kW 8186 kWh 6140 kWh 2047 kWh £1,629 £205 £1,833 £23,276 12.7 yrs £13,394

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: £1,163, 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 2047 kWh 1576 kWh 471 kWh £418 £47 £465 £13,519 29.1 yrs £-4,216
3 kW 3070 kWh 2364 kWh 706 kWh £627 £71 £698 £15,554 22.3 yrs £-1,599
4 kW 4093 kWh 3152 kWh 941 kWh £836 £94 £930 £17,588 18.9 yrs £1,018
5 kW 5116 kWh 3940 kWh 1177 kWh £1,045 £118 £1,163 £19,623 16.9 yrs £3,634
6 kW 6140 kWh 4728 kWh 1412 kWh £1,254 £141 £1,395 £21,657 15.5 yrs £6,251
7 kW 7163 kWh 5515 kWh 1647 kWh £1,463 £165 £1,628 £23,692 14.6 yrs £8,868
8 kW 8186 kWh 6303 kWh 1883 kWh £1,672 £188 £1,861 £25,726 13.8 yrs £11,485

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 RM20

Figures below are tailored to RM20 — click through for full league tables.

Big-Roof Britain Rank #2095 of 2182
3.9 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #433 of 2997
10.4 years (UK avg 11.3 years)
~£781 /yr • £8,138 upfront
Standing-Charge Drag Rank #2014 of 2997
22.5% (UK avg 21.7%) drag on savings
£176 fixed • ~£781 /yr value

Your Area at a Glance

Your Electricity Rate
26.53p/kWh
Daily Fixed Charge
48.25p/day
Local Sunshine
1023kWh/kW
A 1 kW system generates ~1023 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 59% • Flats: 40% • Bungalows: 0% Based on 2,202 properties

Coverage

Thurrock (100%)

Areas Covered

West Thurrock and South Stifford, Grays Riverside

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 Eastern

RM19 (Thurrock)
≈2.6 km away
Local sunshine: ~1,030 kWh/kWp · +1% vs RM20
RM17 (Thurrock)
≈2.8 km away
Local sunshine: ~1,030 kWh/kWp · +1% vs RM20
RM16 (Thurrock)
≈2.9 km away
Local sunshine: ~1,030 kWh/kWp · +1% vs RM20
RM15 (Thurrock)
≈3.5 km away
Local sunshine: ~1,024 kWh/kWp · +0% vs RM20
RM18 (Thurrock)
≈5.9 km away
Local sunshine: ~1,033 kWh/kWp · +1% vs RM20
RM13 (Havering)
≈7.9 km away
Local sunshine: ~1,015 kWh/kWp · -1% vs RM20

Similar sunshine across the UK

TN15 (Sevenoaks)
~1,023 kWh/kWp · +0% vs RM20
TN14 (Sevenoaks)
~1,023 kWh/kWp · +0% vs RM20
TN3 (Tunbridge Wells)
~1,023 kWh/kWp · +0% vs RM20