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Solar panel cost in Horsham (RH20)

See realistic solar installation costs, savings and payback for RH20 (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
9.3 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,053
What you save every year
Profit Over 25 Years
£16,547
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 1052 kWh/kW — 23 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 1052 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)
1052 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: £877, Upfront: £8,139, Break-even: 9.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 842 kWh 1263 kWh £225 £126 £351 £3,256 9.3 yrs £3,761
3 kW 3157 kWh 1263 kWh 1894 kWh £337 £189 £526 £4,883 9.3 yrs £5,642
4 kW 4210 kWh 1684 kWh 2526 kWh £449 £253 £702 £6,511 9.3 yrs £7,523
5 kW 5262 kWh 2105 kWh 3157 kWh £561 £316 £877 £8,139 9.3 yrs £9,403
6 kW 6315 kWh 2526 kWh 3789 kWh £674 £379 £1,053 £9,767 9.3 yrs £11,284
7 kW 7367 kWh 2947 kWh 4420 kWh £786 £442 £1,228 £11,394 9.3 yrs £13,165
8 kW 8420 kWh 3368 kWh 5052 kWh £898 £505 £1,403 £13,022 9.3 yrs £15,045

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: £1,053, Upfront: £10,239, Break-even: 9.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 1263 kWh 842 kWh £337 £84 £421 £5,356 12.7 yrs £3,065
3 kW 3157 kWh 1894 kWh 1263 kWh £505 £126 £632 £6,983 11.1 yrs £5,647
4 kW 4210 kWh 2526 kWh 1684 kWh £674 £168 £842 £8,611 10.2 yrs £8,230
5 kW 5262 kWh 3157 kWh 2105 kWh £842 £210 £1,053 £10,239 9.7 yrs £10,812
6 kW 6315 kWh 3789 kWh 2526 kWh £1,010 £253 £1,263 £11,867 9.4 yrs £13,395
7 kW 7367 kWh 4420 kWh 2947 kWh £1,179 £295 £1,474 £13,494 9.2 yrs £15,977
8 kW 8420 kWh 5052 kWh 3368 kWh £1,347 £337 £1,684 £15,122 9.0 yrs £18,559

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: £1,140, Upfront: £11,639, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 1473 kWh 631 kWh £393 £63 £456 £6,756 14.8 yrs £2,367
3 kW 3157 kWh 2210 kWh 947 kWh £589 £95 £684 £8,383 12.3 yrs £5,300
4 kW 4210 kWh 2947 kWh 1263 kWh £786 £126 £912 £10,011 11.0 yrs £8,233
5 kW 5262 kWh 3684 kWh 1579 kWh £982 £158 £1,140 £11,639 10.2 yrs £11,167
6 kW 6315 kWh 4420 kWh 1894 kWh £1,179 £189 £1,368 £13,267 9.7 yrs £14,100
7 kW 7367 kWh 5157 kWh 2210 kWh £1,375 £221 £1,596 £14,894 9.3 yrs £17,033
8 kW 8420 kWh 5894 kWh 2526 kWh £1,572 £253 £1,824 £16,522 9.1 yrs £19,966

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: £1,167, Upfront: £13,389, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 1537 kWh 568 kWh £410 £57 £467 £8,506 18.2 yrs £827
3 kW 3157 kWh 2305 kWh 852 kWh £615 £85 £700 £10,133 14.5 yrs £3,866
4 kW 4210 kWh 3073 kWh 1137 kWh £820 £114 £933 £11,761 12.6 yrs £6,904
5 kW 5262 kWh 3841 kWh 1421 kWh £1,025 £142 £1,167 £13,389 11.5 yrs £9,943
6 kW 6315 kWh 4610 kWh 1705 kWh £1,229 £170 £1,400 £15,017 10.7 yrs £12,981
7 kW 7367 kWh 5378 kWh 1989 kWh £1,434 £199 £1,633 £16,644 10.2 yrs £16,020
8 kW 8420 kWh 6146 kWh 2273 kWh £1,639 £227 £1,867 £18,272 9.8 yrs £19,059

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: £1,184, Upfront: £15,139, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 1579 kWh 526 kWh £421 £53 £474 £10,256 21.7 yrs £-783
3 kW 3157 kWh 2368 kWh 789 kWh £632 £79 £710 £11,883 16.7 yrs £2,326
4 kW 4210 kWh 3157 kWh 1052 kWh £842 £105 £947 £13,511 14.3 yrs £5,435
5 kW 5262 kWh 3947 kWh 1316 kWh £1,053 £132 £1,184 £15,139 12.8 yrs £8,544
6 kW 6315 kWh 4736 kWh 1579 kWh £1,263 £158 £1,421 £16,767 11.8 yrs £11,652
7 kW 7367 kWh 5525 kWh 1842 kWh £1,474 £184 £1,658 £18,394 11.1 yrs £14,761
8 kW 8420 kWh 6315 kWh 2105 kWh £1,684 £210 £1,895 £20,022 10.6 yrs £17,870

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: £1,202, Upfront: £17,589, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2105 kWh 1621 kWh 484 kWh £432 £48 £481 £12,706 26.4 yrs £-3,092
3 kW 3157 kWh 2431 kWh 726 kWh £648 £73 £721 £14,333 19.9 yrs £87
4 kW 4210 kWh 3242 kWh 968 kWh £865 £97 £961 £15,961 16.6 yrs £3,266
5 kW 5262 kWh 4052 kWh 1210 kWh £1,081 £121 £1,202 £17,589 14.6 yrs £6,445
6 kW 6315 kWh 4862 kWh 1452 kWh £1,297 £145 £1,442 £19,217 13.3 yrs £9,624
7 kW 7367 kWh 5673 kWh 1694 kWh £1,513 £169 £1,682 £20,844 12.4 yrs £12,802
8 kW 8420 kWh 6483 kWh 1936 kWh £1,729 £194 £1,923 £22,472 11.7 yrs £15,981

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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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for RH20

Figures below are tailored to RH20 — click through for full league tables.

Big-Roof Britain Rank #143 of 2182
6.4 kWp (UK avg 5.1 kWp)
~14 panels (≈430 W)
Solar Payback Index Rank #206 of 2996
9.3 years (UK avg 10.8 years)
~£1,052 /yr • £9,767 upfront
Standing-Charge Drag Rank #325 of 2996
18.9% (UK avg 26.6%) drag on savings
£199 fixed • ~£1,052 /yr value
Aspect Penalty View ranking →
East −20.4% West −21.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in RH20

Monthly generation per kilowatt of solar panels

kWh 41 Jan 54 Feb 90 Mar 119 Apr 125 May 129 Jun 129 Jul 114 Aug 98 Sep 69 Oct 48 Nov 36 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.0% 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 44 kWh per month; the average month produces around 88 kWh. So a typical 4 kW home system would generate roughly 176 kWh in winter, or 351 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
1052kWh/kW
A 1 kW system generates ~1052 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: 15% • Bungalows: 19% Based on 6,903 properties

Coverage

Horsham (92%)|Chichester (8%)

Areas Covered

Storrington & Washington, Pulborough, Coldwaltham & Amberley, West Chiltington, Thakeham & Ashington, Fittleworth, Loxwood, Petworth + 1 more

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)
≈10.7 km away
Local sunshine: ~1,086 kWh/kWp · +3% vs RH20
BN13 (Worthing)
≈12.1 km away
Local sunshine: ~1,119 kWh/kWp · +6% vs RH20
BN5 (Horsham)
≈13.2 km away
Local sunshine: ~1,083 kWh/kWp · +3% vs RH20
BN14 (Worthing)
≈13.3 km away
Local sunshine: ~1,119 kWh/kWp · +6% vs RH20
BN16 (Arun)
≈13.6 km away
Local sunshine: ~1,128 kWh/kWp · +7% vs RH20
BN12 (Worthing)
≈13.6 km away
Local sunshine: ~1,123 kWh/kWp · +7% vs RH20

Similar sunshine across the UK

CF35 (Bridgend)
~1,052 kWh/kWp · -0% vs RH20
SO45 (New Forest)
~1,052 kWh/kWp · -0% vs RH20
IP16 (East Suffolk)
~1,051 kWh/kWp · -0% vs RH20