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Solar panel cost in Castle Point (SS8)

See realistic solar installation costs, savings and payback for SS8 (Castle Point) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
9.5 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£859
What you save every year
Profit Over 25 Years
£13,346
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 26.38p/kWh with a 53.94p/day standing charge. Your postcode’s south-facing sunshine yield is 1038 kWh/kW — 29 above the regional median (1009).

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 1038 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
53.9p/day
Sunshine yield (south)
1038 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: £859, Upfront: £8,139, Break-even: 9.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2077 kWh 831 kWh 1246 kWh £219 £125 £344 £3,256 9.5 yrs £3,620
3 kW 3115 kWh 1246 kWh 1869 kWh £329 £187 £516 £4,883 9.5 yrs £5,429
4 kW 4154 kWh 1661 kWh 2492 kWh £438 £249 £688 £6,511 9.5 yrs £7,239
5 kW 5192 kWh 2077 kWh 3115 kWh £548 £312 £859 £8,139 9.5 yrs £9,049
6 kW 6230 kWh 2492 kWh 3738 kWh £657 £374 £1,031 £9,767 9.5 yrs £10,859
7 kW 7269 kWh 2908 kWh 4361 kWh £767 £436 £1,203 £11,394 9.5 yrs £12,669
8 kW 8307 kWh 3323 kWh 4984 kWh £877 £498 £1,375 £13,022 9.5 yrs £14,478

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,029, Upfront: £10,239, Break-even: 9.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2077 kWh 1246 kWh 831 kWh £329 £83 £412 £5,356 13.0 yrs £2,880
3 kW 3115 kWh 1869 kWh 1246 kWh £493 £125 £618 £6,983 11.3 yrs £5,370
4 kW 4154 kWh 2492 kWh 1661 kWh £657 £166 £824 £8,611 10.5 yrs £7,861
5 kW 5192 kWh 3115 kWh 2077 kWh £822 £208 £1,029 £10,239 9.9 yrs £10,351
6 kW 6230 kWh 3738 kWh 2492 kWh £986 £249 £1,235 £11,867 9.6 yrs £12,841
7 kW 7269 kWh 4361 kWh 2908 kWh £1,151 £291 £1,441 £13,494 9.4 yrs £15,331
8 kW 8307 kWh 4984 kWh 3323 kWh £1,315 £332 £1,647 £15,122 9.2 yrs £17,821

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,115, Upfront: £11,639, Break-even: 10.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2077 kWh 1454 kWh 623 kWh £384 £62 £446 £6,756 15.2 yrs £2,161
3 kW 3115 kWh 2181 kWh 935 kWh £575 £93 £669 £8,383 12.5 yrs £4,991
4 kW 4154 kWh 2908 kWh 1246 kWh £767 £125 £892 £10,011 11.2 yrs £7,821
5 kW 5192 kWh 3634 kWh 1558 kWh £959 £156 £1,115 £11,639 10.4 yrs £10,652
6 kW 6230 kWh 4361 kWh 1869 kWh £1,151 £187 £1,337 £13,267 9.9 yrs £13,482
7 kW 7269 kWh 5088 kWh 2181 kWh £1,342 £218 £1,560 £14,894 9.5 yrs £16,312
8 kW 8307 kWh 5815 kWh 2492 kWh £1,534 £249 £1,783 £16,522 9.3 yrs £19,143

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,140, Upfront: £13,389, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2077 kWh 1516 kWh 561 kWh £400 £56 £456 £8,506 18.7 yrs £615
3 kW 3115 kWh 2274 kWh 841 kWh £600 £84 £684 £10,133 14.8 yrs £3,547
4 kW 4154 kWh 3032 kWh 1121 kWh £800 £112 £912 £11,761 12.9 yrs £6,480
5 kW 5192 kWh 3790 kWh 1402 kWh £1,000 £140 £1,140 £13,389 11.7 yrs £9,412
6 kW 6230 kWh 4548 kWh 1682 kWh £1,200 £168 £1,368 £15,017 11.0 yrs £12,344
7 kW 7269 kWh 5306 kWh 1963 kWh £1,400 £196 £1,596 £16,644 10.4 yrs £15,277
8 kW 8307 kWh 6064 kWh 2243 kWh £1,600 £224 £1,824 £18,272 10.0 yrs £18,209

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,157, Upfront: £15,139, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2077 kWh 1558 kWh 519 kWh £411 £52 £463 £10,256 22.2 yrs £-999
3 kW 3115 kWh 2336 kWh 779 kWh £616 £78 £694 £11,883 17.1 yrs £2,001
4 kW 4154 kWh 3115 kWh 1038 kWh £822 £104 £926 £13,511 14.6 yrs £5,002
5 kW 5192 kWh 3894 kWh 1298 kWh £1,027 £130 £1,157 £15,139 13.1 yrs £8,002
6 kW 6230 kWh 4673 kWh 1558 kWh £1,233 £156 £1,388 £16,767 12.1 yrs £11,003
7 kW 7269 kWh 5452 kWh 1817 kWh £1,438 £182 £1,620 £18,394 11.4 yrs £14,003
8 kW 8307 kWh 6230 kWh 2077 kWh £1,644 £208 £1,851 £20,022 10.8 yrs £17,003

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,174, Upfront: £17,589, 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 2077 kWh 1599 kWh 478 kWh £422 £48 £470 £12,706 27.1 yrs £-3,313
3 kW 3115 kWh 2399 kWh 717 kWh £633 £72 £704 £14,333 20.3 yrs £-245
4 kW 4154 kWh 3198 kWh 955 kWh £844 £96 £939 £15,961 17.0 yrs £2,824
5 kW 5192 kWh 3998 kWh 1194 kWh £1,055 £119 £1,174 £17,589 15.0 yrs £5,892
6 kW 6230 kWh 4797 kWh 1433 kWh £1,266 £143 £1,409 £19,217 13.6 yrs £8,961
7 kW 7269 kWh 5597 kWh 1672 kWh £1,476 £167 £1,644 £20,844 12.7 yrs £12,029
8 kW 8307 kWh 6397 kWh 1911 kWh £1,687 £191 £1,878 £22,472 12.0 yrs £15,098

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Castle Point

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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Insights for SS8

Figures below are tailored to SS8 — click through for full league tables.

Big-Roof Britain Rank #507 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #325 of 2996
9.5 years (UK avg 10.8 years)
~£859 /yr • £8,139 upfront
Standing-Charge Drag Rank #1003 of 2996
22.9% (UK avg 26.6%) drag on savings
£197 fixed • ~£859 /yr value
Aspect Penalty View ranking →
East −21.6% West −21.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SS8

Monthly generation per kilowatt of solar panels

kWh 40 Jan 54 Feb 87 Mar 117 Apr 124 May 125 Jun 126 Jul 114 Aug 97 Sep 70 Oct 49 Nov 37 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.2% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 43 kWh per month; the average month produces around 87 kWh. So a typical 4 kW home system would generate roughly 174 kWh in winter, or 346 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.38p/kWh
Daily Fixed Charge
53.94p/day
Local Sunshine
1038kWh/kW
A 1 kW system generates ~1038 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: 48% • Flats: 12% • Bungalows: 34% Based on 8,416 properties

Coverage

Castle Point (100%)

Areas Covered

Canvey Island South, Canvey Island East, Canvey Island Central, Canvey Island North, Canvey Island Winter Gardens

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

SS7 (Castle Point)
≈4.8 km away
Local sunshine: ~1,042 kWh/kWp · +0% vs SS8
SS9 (Southend-on-Sea)
≈5.0 km away
Local sunshine: ~1,039 kWh/kWp · +0% vs SS8
SS6 (Rochford)
≈7.0 km away
Local sunshine: ~1,047 kWh/kWp · +1% vs SS8
SS0 (Southend-on-Sea)
≈7.2 km away
Local sunshine: ~1,056 kWh/kWp · +2% vs SS8
SS13 (Basildon)
≈8.0 km away
Local sunshine: ~1,043 kWh/kWp · +0% vs SS8
SS99 (Southend-on-Sea)
≈8.5 km away
Local sunshine: ~1,055 kWh/kWp · +2% vs SS8

Similar sunshine across the UK

EX10 (East Devon)
~1,038 kWh/kWp · -0% vs SS8
SO97 (Eastleigh)
~1,038 kWh/kWp · -0% vs SS8
TR3 (Cornwall)
~1,038 kWh/kWp · -0% vs SS8