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Solar panel cost in Horsham (BN5)

See realistic solar installation costs, savings and payback for BN5 (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
9.0 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,083
What you save every year
Profit Over 25 Years
£17,301
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 South East, the current unit rate is 26.67p/kWh with a 54.45p/day standing charge. Your postcode’s south-facing sunshine yield is 1083 kWh/kW — 54 above 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 1083 kWh per year on a south-facing roof. We value self-used electricity at 26.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.7p/kWh
Standing charge
54.5p/day
Sunshine yield (south)
1083 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: £902, Upfront: £8,139, Break-even: 9.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2165 kWh 866 kWh 1299 kWh £231 £130 £361 £3,256 9.0 yrs £3,963
3 kW 3248 kWh 1299 kWh 1949 kWh £346 £195 £541 £4,883 9.0 yrs £5,944
4 kW 4331 kWh 1732 kWh 2598 kWh £462 £260 £722 £6,511 9.0 yrs £7,925
5 kW 5413 kWh 2165 kWh 3248 kWh £577 £325 £902 £8,139 9.0 yrs £9,906
6 kW 6496 kWh 2598 kWh 3897 kWh £693 £390 £1,083 £9,767 9.0 yrs £11,888
7 kW 7578 kWh 3031 kWh 4547 kWh £808 £455 £1,263 £11,394 9.0 yrs £13,869
8 kW 8661 kWh 3464 kWh 5197 kWh £924 £520 £1,444 £13,022 9.0 yrs £15,850

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: £1,083, Upfront: £10,239, 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 2165 kWh 1299 kWh 866 kWh £346 £87 £433 £5,356 12.4 yrs £3,306
3 kW 3248 kWh 1949 kWh 1299 kWh £520 £130 £650 £6,983 10.7 yrs £6,010
4 kW 4331 kWh 2598 kWh 1732 kWh £693 £173 £866 £8,611 9.9 yrs £8,713
5 kW 5413 kWh 3248 kWh 2165 kWh £866 £217 £1,083 £10,239 9.5 yrs £11,416
6 kW 6496 kWh 3897 kWh 2598 kWh £1,039 £260 £1,299 £11,867 9.1 yrs £14,119
7 kW 7578 kWh 4547 kWh 3031 kWh £1,213 £303 £1,516 £13,494 8.9 yrs £16,822
8 kW 8661 kWh 5197 kWh 3464 kWh £1,386 £346 £1,732 £15,122 8.7 yrs £19,526

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: £1,173, Upfront: £11,639, 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 2165 kWh 1516 kWh 650 kWh £404 £65 £469 £6,756 14.4 yrs £2,628
3 kW 3248 kWh 2274 kWh 974 kWh £606 £97 £704 £8,383 11.9 yrs £5,692
4 kW 4331 kWh 3031 kWh 1299 kWh £808 £130 £938 £10,011 10.7 yrs £8,757
5 kW 5413 kWh 3789 kWh 1624 kWh £1,011 £162 £1,173 £11,639 9.9 yrs £11,821
6 kW 6496 kWh 4547 kWh 1949 kWh £1,213 £195 £1,408 £13,267 9.4 yrs £14,885
7 kW 7578 kWh 5305 kWh 2274 kWh £1,415 £227 £1,642 £14,894 9.1 yrs £17,949
8 kW 8661 kWh 6063 kWh 2598 kWh £1,617 £260 £1,877 £16,522 8.8 yrs £21,013

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: £1,200, Upfront: £13,389, Break-even: 11.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2165 kWh 1581 kWh 585 kWh £422 £58 £480 £8,506 17.7 yrs £1,095
3 kW 3248 kWh 2371 kWh 877 kWh £632 £88 £720 £10,133 14.1 yrs £4,267
4 kW 4331 kWh 3161 kWh 1169 kWh £843 £117 £960 £11,761 12.3 yrs £7,440
5 kW 5413 kWh 3952 kWh 1462 kWh £1,054 £146 £1,200 £13,389 11.2 yrs £10,612
6 kW 6496 kWh 4742 kWh 1754 kWh £1,265 £175 £1,440 £15,017 10.4 yrs £13,785
7 kW 7578 kWh 5532 kWh 2046 kWh £1,475 £205 £1,680 £16,644 9.9 yrs £16,957
8 kW 8661 kWh 6323 kWh 2338 kWh £1,686 £234 £1,920 £18,272 9.5 yrs £20,129

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: £1,218, Upfront: £15,139, 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 2165 kWh 1624 kWh 541 kWh £433 £54 £487 £10,256 21.0 yrs £-511
3 kW 3248 kWh 2436 kWh 812 kWh £650 £81 £731 £11,883 16.3 yrs £2,734
4 kW 4331 kWh 3248 kWh 1083 kWh £866 £108 £974 £13,511 13.9 yrs £5,978
5 kW 5413 kWh 4060 kWh 1353 kWh £1,083 £135 £1,218 £15,139 12.4 yrs £9,223
6 kW 6496 kWh 4872 kWh 1624 kWh £1,299 £162 £1,462 £16,767 11.5 yrs £12,468
7 kW 7578 kWh 5684 kWh 1895 kWh £1,516 £189 £1,705 £18,394 10.8 yrs £15,712
8 kW 8661 kWh 6496 kWh 2165 kWh £1,732 £217 £1,949 £20,022 10.3 yrs £18,957

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: £1,236, Upfront: £17,589, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2165 kWh 1667 kWh 498 kWh £445 £50 £494 £12,706 25.7 yrs £-2,816
3 kW 3248 kWh 2501 kWh 747 kWh £667 £75 £742 £14,333 19.3 yrs £500
4 kW 4331 kWh 3335 kWh 996 kWh £889 £100 £989 £15,961 16.1 yrs £3,817
5 kW 5413 kWh 4168 kWh 1245 kWh £1,112 £125 £1,236 £17,589 14.2 yrs £7,134
6 kW 6496 kWh 5002 kWh 1494 kWh £1,334 £149 £1,483 £19,217 13.0 yrs £10,451
7 kW 7578 kWh 5835 kWh 1743 kWh £1,556 £174 £1,731 £20,844 12.0 yrs £13,768
8 kW 8661 kWh 6669 kWh 1992 kWh £1,779 £199 £1,978 £22,472 11.4 yrs £17,084

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 Horsham

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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Understand DNO, G98 and G99 export limits

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Insights for BN5

Figures below are tailored to BN5 — click through for full league tables.

Big-Roof Britain Rank #396 of 2182
5.7 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #92 of 2996
9.0 years (UK avg 10.8 years)
~£1,083 /yr • £9,767 upfront
Standing-Charge Drag Rank #267 of 2996
18.4% (UK avg 26.6%) drag on savings
£199 fixed • ~£1,083 /yr value
Aspect Penalty View ranking →
East −20.4% West −21.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BN5

Monthly generation per kilowatt of solar panels

kWh 41 Jan 56 Feb 93 Mar 124 Apr 129 May 133 Jun 133 Jul 118 Aug 100 Sep 70 Oct 48 Nov 37 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.4% 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 45 kWh per month; the average month produces around 90 kWh. So a typical 4 kW home system would generate roughly 178 kWh in winter, or 361 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
1083kWh/kW
A 1 kW system generates ~1083 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: 64% • Flats: 17% • Bungalows: 19% Based on 2,124 properties

Coverage

Horsham (96%)|Mid Sussex (4%)

Areas Covered

Henfield, Bramber, Upper Beeding & Woodmancote, Downland Villages, Cowfold, Shermanbury & West Grinstead

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 South East

BN44 (Horsham)
≈5.8 km away
Local sunshine: ~1,086 kWh/kWp · +0% vs BN5
BN45 (Mid Sussex)
≈6.5 km away
Local sunshine: ~1,068 kWh/kWp · -1% vs BN5
BN6 (Mid Sussex)
≈8.9 km away
Local sunshine: ~1,084 kWh/kWp · +0% vs BN5
BN4 (Adur)
≈9.9 km away
Local sunshine: ~1,110 kWh/kWp · +3% vs BN5
RH15 (Mid Sussex)
≈9.9 km away
Local sunshine: ~1,060 kWh/kWp · -2% vs BN5
BN43 (Adur)
≈10.4 km away
Local sunshine: ~1,109 kWh/kWp · +2% vs BN5

Similar sunshine across the UK

SS5 (Rochford)
~1,083 kWh/kWp · +0% vs BN5
TR19 (Cornwall)
~1,083 kWh/kWp · +0% vs BN5
TR13 (Cornwall)
~1,082 kWh/kWp · -0% vs BN5