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Solar panel cost in Buckinghamshire (HP20)

See realistic solar installation costs, savings and payback for HP20 (Buckinghamshire) 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
11.2 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£650
What you save every year
Profit Over 25 Years
£8,949
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 982 kWh/kW — 27 below 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 982 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)
982 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: £813, Upfront: £9,134, 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 1964 kWh 786 kWh 1179 kWh £207 £118 £325 £3,654 11.2 yrs £2,849
3 kW 2946 kWh 1179 kWh 1768 kWh £311 £177 £488 £5,481 11.2 yrs £4,273
4 kW 3928 kWh 1571 kWh 2357 kWh £415 £236 £650 £7,307 11.2 yrs £5,697
5 kW 4911 kWh 1964 kWh 2946 kWh £518 £295 £813 £9,134 11.2 yrs £7,122
6 kW 5893 kWh 2357 kWh 3536 kWh £622 £354 £975 £10,961 11.2 yrs £8,546
7 kW 6875 kWh 2750 kWh 4125 kWh £725 £412 £1,138 £12,788 11.2 yrs £9,971
8 kW 7857 kWh 3143 kWh 4714 kWh £829 £471 £1,300 £14,615 11.2 yrs £11,395

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £974, Upfront: £11,234, 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 1964 kWh 1179 kWh 786 kWh £311 £79 £389 £5,754 14.8 yrs £2,036
3 kW 2946 kWh 1768 kWh 1179 kWh £466 £118 £584 £7,581 13.0 yrs £4,104
4 kW 3928 kWh 2357 kWh 1571 kWh £622 £157 £779 £9,407 12.1 yrs £6,171
5 kW 4911 kWh 2946 kWh 1964 kWh £777 £196 £974 £11,234 11.5 yrs £8,239
6 kW 5893 kWh 3536 kWh 2357 kWh £933 £236 £1,168 £13,061 11.2 yrs £10,307
7 kW 6875 kWh 4125 kWh 2750 kWh £1,088 £275 £1,363 £14,888 10.9 yrs £12,375
8 kW 7857 kWh 4714 kWh 3143 kWh £1,244 £314 £1,558 £16,715 10.7 yrs £14,443

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,054, Upfront: £12,634, 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 1964 kWh 1375 kWh 589 kWh £363 £59 £422 £7,154 17.0 yrs £1,279
3 kW 2946 kWh 2062 kWh 884 kWh £544 £88 £632 £8,981 14.2 yrs £3,669
4 kW 3928 kWh 2750 kWh 1179 kWh £725 £118 £843 £10,807 12.8 yrs £6,058
5 kW 4911 kWh 3437 kWh 1473 kWh £907 £147 £1,054 £12,634 12.0 yrs £8,448
6 kW 5893 kWh 4125 kWh 1768 kWh £1,088 £177 £1,265 £14,461 11.4 yrs £10,838
7 kW 6875 kWh 4812 kWh 2062 kWh £1,270 £206 £1,476 £16,288 11.0 yrs £13,227
8 kW 7857 kWh 5500 kWh 2357 kWh £1,451 £236 £1,687 £18,115 10.7 yrs £15,617

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,078, Upfront: £14,384, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1434 kWh 530 kWh £378 £53 £431 £8,904 20.6 yrs £-278
3 kW 2946 kWh 2151 kWh 796 kWh £567 £80 £647 £10,731 16.6 yrs £2,208
4 kW 3928 kWh 2868 kWh 1061 kWh £757 £106 £863 £12,557 14.6 yrs £4,694
5 kW 4911 kWh 3585 kWh 1326 kWh £946 £133 £1,078 £14,384 13.3 yrs £7,181
6 kW 5893 kWh 4302 kWh 1591 kWh £1,135 £159 £1,294 £16,211 12.5 yrs £9,667
7 kW 6875 kWh 5019 kWh 1856 kWh £1,324 £186 £1,510 £18,038 11.9 yrs £12,153
8 kW 7857 kWh 5736 kWh 2121 kWh £1,513 £212 £1,725 £19,865 11.5 yrs £14,639

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,094, Upfront: £16,134, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1473 kWh 491 kWh £389 £49 £438 £10,654 24.3 yrs £-1,899
3 kW 2946 kWh 2210 kWh 737 kWh £583 £74 £657 £12,481 19.0 yrs £651
4 kW 3928 kWh 2946 kWh 982 kWh £777 £98 £875 £14,307 16.3 yrs £3,202
5 kW 4911 kWh 3683 kWh 1228 kWh £972 £123 £1,094 £16,134 14.7 yrs £5,752
6 kW 5893 kWh 4420 kWh 1473 kWh £1,166 £147 £1,313 £17,961 13.7 yrs £8,303
7 kW 6875 kWh 5156 kWh 1719 kWh £1,360 £172 £1,532 £19,788 12.9 yrs £10,853
8 kW 7857 kWh 5893 kWh 1964 kWh £1,554 £196 £1,751 £21,615 12.3 yrs £13,404

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,110, Upfront: £18,584, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1964 kWh 1512 kWh 452 kWh £399 £45 £444 £13,104 29.5 yrs £-4,220
3 kW 2946 kWh 2269 kWh 678 kWh £598 £68 £666 £14,931 22.4 yrs £-1,606
4 kW 3928 kWh 3025 kWh 904 kWh £798 £90 £888 £16,757 18.9 yrs £1,009
5 kW 4911 kWh 3781 kWh 1129 kWh £997 £113 £1,110 £18,584 16.7 yrs £3,624
6 kW 5893 kWh 4537 kWh 1355 kWh £1,197 £136 £1,332 £20,411 15.3 yrs £6,239
7 kW 6875 kWh 5294 kWh 1581 kWh £1,396 £158 £1,555 £22,238 14.3 yrs £8,854
8 kW 7857 kWh 6050 kWh 1807 kWh £1,596 £181 £1,777 £24,065 13.5 yrs £11,469

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, 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 Buckinghamshire

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 HP20

Figures below are tailored to HP20 — click through for full league tables.

Big-Roof Britain Rank #2042 of 2182
4.0 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #2149 of 2996
11.2 years (UK avg 10.8 years)
~£650 /yr • £7,307 upfront
Standing-Charge Drag Rank #2168 of 2996
30.3% (UK avg 26.6%) drag on savings
£197 fixed • ~£650 /yr value
Aspect Penalty View ranking →
East −21.0% West −19.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in HP20

Monthly generation per kilowatt of solar panels

kWh 38 Jan 52 Feb 84 Mar 110 Apr 117 May 119 Jun 121 Jul 106 Aug 92 Sep 66 Oct 44 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.0% 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 41 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 164 kWh in winter, or 327 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.38p/kWh
Daily Fixed Charge
53.94p/day
Local Sunshine
982kWh/kW
A 1 kW system generates ~982 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: 51% • Flats: 42% • Bungalows: 4% Based on 4,822 properties

Coverage

Buckinghamshire (100%)

Areas Covered

Aylesbury North, Aylesbury East, Aylesbury North West, Berryfields, Buckingham Park & Watermead, Aylesbury South East, Bierton, Kingsbrook & Wing

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

HP19 (Buckinghamshire)
≈1.3 km away
Local sunshine: ~982 kWh/kWp · +0% vs HP20
HP21 (Buckinghamshire)
≈1.3 km away
Local sunshine: ~984 kWh/kWp · +0% vs HP20
HP22 (Buckinghamshire)
≈4.6 km away
Local sunshine: ~983 kWh/kWp · +0% vs HP20
HP17 (Buckinghamshire)
≈7.8 km away
Local sunshine: ~971 kWh/kWp · -1% vs HP20
HP23 (Dacorum)
≈10.2 km away
Local sunshine: ~980 kWh/kWp · -0% vs HP20
HP27 (Buckinghamshire)
≈10.8 km away
Local sunshine: ~971 kWh/kWp · -1% vs HP20

Similar sunshine across the UK

MK98 (Milton Keynes)
~982 kWh/kWp · -0% vs HP20
OX9 (South Oxfordshire)
~982 kWh/kWp · -0% vs HP20
GL12 (Stroud)
~982 kWh/kWp · -0% vs HP20