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Solar panel cost in Horsham (RH13)

See realistic solar installation costs, savings and payback for RH13 (Horsham) 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
12.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£947
What you save every year
Profit Over 25 Years
£11,470
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 23.53p/kWh with a 54.74p/day standing charge. Your postcode’s south-facing sunshine yield is 1024 kWh/kW — 5 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 1024 kWh per year on a south-facing roof. We value self-used electricity at 23.5p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
23.5p/kWh
Standing charge
54.7p/day
Sunshine yield (south)
1024 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: £789, Upfront: £10,173, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 819 kWh 1229 kWh £193 £123 £316 £4,069 12.9 yrs £2,245
3 kW 3073 kWh 1229 kWh 1844 kWh £289 £184 £474 £6,104 12.9 yrs £3,367
4 kW 4097 kWh 1639 kWh 2458 kWh £386 £246 £631 £8,138 12.9 yrs £4,490
5 kW 5121 kWh 2048 kWh 3073 kWh £482 £307 £789 £10,173 12.9 yrs £5,612
6 kW 6145 kWh 2458 kWh 3687 kWh £578 £369 £947 £12,207 12.9 yrs £6,734
7 kW 7169 kWh 2868 kWh 4302 kWh £675 £430 £1,105 £14,242 12.9 yrs £7,857
8 kW 8193 kWh 3277 kWh 4916 kWh £771 £492 £1,263 £16,276 12.9 yrs £8,979

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: £928, Upfront: £12,273, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1229 kWh 819 kWh £289 £82 £371 £6,169 16.6 yrs £1,253
3 kW 3073 kWh 1844 kWh 1229 kWh £434 £123 £557 £8,204 14.7 yrs £2,930
4 kW 4097 kWh 2458 kWh 1639 kWh £578 £164 £742 £10,238 13.8 yrs £4,607
5 kW 5121 kWh 3073 kWh 2048 kWh £723 £205 £928 £12,273 13.2 yrs £6,283
6 kW 6145 kWh 3687 kWh 2458 kWh £868 £246 £1,113 £14,307 12.9 yrs £7,960
7 kW 7169 kWh 4302 kWh 2868 kWh £1,012 £287 £1,299 £16,342 12.6 yrs £9,637
8 kW 8193 kWh 4916 kWh 3277 kWh £1,157 £328 £1,484 £18,376 12.4 yrs £11,313

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: £997, Upfront: £13,673, 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 2048 kWh 1434 kWh 615 kWh £337 £61 £399 £7,569 19.0 yrs £408
3 kW 3073 kWh 2151 kWh 922 kWh £506 £92 £598 £9,604 16.1 yrs £2,361
4 kW 4097 kWh 2868 kWh 1229 kWh £675 £123 £798 £11,638 14.6 yrs £4,315
5 kW 5121 kWh 3585 kWh 1536 kWh £843 £154 £997 £13,673 13.7 yrs £6,269
6 kW 6145 kWh 4302 kWh 1844 kWh £1,012 £184 £1,196 £15,707 13.1 yrs £8,223
7 kW 7169 kWh 5018 kWh 2151 kWh £1,181 £215 £1,396 £17,742 12.7 yrs £10,177
8 kW 8193 kWh 5735 kWh 2458 kWh £1,350 £246 £1,595 £19,776 12.4 yrs £12,131

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: £1,018, Upfront: £15,423, 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 2048 kWh 1495 kWh 553 kWh £352 £55 £407 £9,319 22.9 yrs £-1,176
3 kW 3073 kWh 2243 kWh 830 kWh £528 £83 £611 £11,354 18.6 yrs £861
4 kW 4097 kWh 2991 kWh 1106 kWh £704 £111 £814 £13,388 16.4 yrs £2,898
5 kW 5121 kWh 3738 kWh 1383 kWh £880 £138 £1,018 £15,423 15.2 yrs £4,935
6 kW 6145 kWh 4486 kWh 1659 kWh £1,056 £166 £1,221 £17,457 14.3 yrs £6,972
7 kW 7169 kWh 5234 kWh 1936 kWh £1,231 £194 £1,425 £19,492 13.7 yrs £9,009
8 kW 8193 kWh 5981 kWh 2212 kWh £1,407 £221 £1,629 £21,526 13.2 yrs £11,046

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: £1,032, Upfront: £17,173, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1536 kWh 512 kWh £361 £51 £413 £11,069 26.8 yrs £-2,815
3 kW 3073 kWh 2304 kWh 768 kWh £542 £77 £619 £13,104 21.2 yrs £-723
4 kW 4097 kWh 3073 kWh 1024 kWh £723 £102 £825 £15,138 18.3 yrs £1,370
5 kW 5121 kWh 3841 kWh 1280 kWh £904 £128 £1,032 £17,173 16.6 yrs £3,462
6 kW 6145 kWh 4609 kWh 1536 kWh £1,084 £154 £1,238 £19,207 15.5 yrs £5,554
7 kW 7169 kWh 5377 kWh 1792 kWh £1,265 £179 £1,444 £21,242 14.7 yrs £7,647
8 kW 8193 kWh 6145 kWh 2048 kWh £1,446 £205 £1,651 £23,276 14.1 yrs £9,739

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: £1,046, Upfront: £19,623, Break-even: 18.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1577 kWh 471 kWh £371 £47 £418 £13,519 32.3 yrs £-5,154
3 kW 3073 kWh 2366 kWh 707 kWh £557 £71 £627 £15,554 24.8 yrs £-3,007
4 kW 4097 kWh 3154 kWh 942 kWh £742 £94 £836 £17,588 21.0 yrs £-859
5 kW 5121 kWh 3943 kWh 1178 kWh £928 £118 £1,046 £19,623 18.8 yrs £1,289
6 kW 6145 kWh 4732 kWh 1413 kWh £1,113 £141 £1,255 £21,657 17.3 yrs £3,437
7 kW 7169 kWh 5520 kWh 1649 kWh £1,299 £165 £1,464 £23,692 16.2 yrs £5,585
8 kW 8193 kWh 6309 kWh 1884 kWh £1,484 £188 £1,673 £25,726 15.4 yrs £7,732

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 RH13

Figures below are tailored to RH13 — click through for full league tables.

Big-Roof Britain Rank #849 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #361 of 2997
11.5 years (UK avg 12.6 years)
~£1,064 /yr • £12,207 upfront
Standing-Charge Drag Rank #207 of 2997
16.7% (UK avg 24.6%) drag on savings
£178 fixed • ~£1,064 /yr value
Aspect Penalty View ranking →
East −20.5% West −20.2%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in RH13

Monthly generation per kilowatt of solar panels

kWh 39 Jan 53 Feb 88 Mar 116 Apr 122 May 126 Jun 125 Jul 111 Aug 95 Sep 67 Oct 47 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.8% of an average month (Dec–Feb)

Best / worst month: Jun / 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 85 kWh. So a typical 4 kW home system would generate roughly 170 kWh in winter, or 341 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
23.53p/kWh
Daily Fixed Charge
54.74p/day
Local Sunshine
1024kWh/kW
A 1 kW system generates ~1024 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: 63% • Flats: 24% • Bungalows: 9% Based on 9,736 properties

Coverage

Horsham (100%)

Areas Covered

Southwater South & Shipley, Forest, Southwater North, Holbrook West, Itchingfield, Slinfold & Warnham, Cowfold, Shermanbury & West Grinstead + 7 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q1 2026

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

RH12 (Horsham)
≈2.5 km away
Local sunshine: ~1,006 kWh/kWp · -2% vs RH13
RH11 (Crawley)
≈11.2 km away
Local sunshine: ~1,008 kWh/kWp · -2% vs RH13
RH10 (Crawley)
≈12.9 km away
Local sunshine: ~1,005 kWh/kWp · -2% vs RH13
BN5 (Horsham)
≈13.7 km away
Local sunshine: ~1,083 kWh/kWp · +6% vs RH13
RH17 (Mid Sussex)
≈14.3 km away
Local sunshine: ~1,033 kWh/kWp · +1% vs RH13
RH77 (Crawley)
≈14.8 km away
Local sunshine: ~1,007 kWh/kWp · -2% vs RH13

Similar sunshine across the UK

CF5 (Cardiff)
~1,024 kWh/kWp · -0% vs RH13
RM15 (Thurrock)
~1,024 kWh/kWp · -0% vs RH13
CM14 (Brentwood)
~1,024 kWh/kWp · +0% vs RH13