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Solar panel cost in Milton Keynes (MK15)

See realistic solar installation costs, savings and payback for MK15 (Milton Keynes) 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
10.4 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£784
What you save every year
Profit Over 25 Years
£11,463
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 East Midlands, the current unit rate is 25.10p/kWh with a 53.60p/day standing charge. Your postcode’s south-facing sunshine yield is 978 kWh/kW — 9 above the regional median (968).

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 978 kWh per year on a south-facing roof. We value self-used electricity at 25.1p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.1p/kWh
Standing charge
53.6p/day
Sunshine yield (south)
978 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: £784, Upfront: £8,139, 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 1955 kWh 782 kWh 1173 kWh £196 £117 £314 £3,256 10.4 yrs £3,017
3 kW 2933 kWh 1173 kWh 1760 kWh £294 £176 £470 £4,883 10.4 yrs £4,526
4 kW 3911 kWh 1564 kWh 2346 kWh £393 £235 £627 £6,511 10.4 yrs £6,034
5 kW 4888 kWh 1955 kWh 2933 kWh £491 £293 £784 £8,139 10.4 yrs £7,543
6 kW 5866 kWh 2346 kWh 3520 kWh £589 £352 £941 £9,767 10.4 yrs £9,052
7 kW 6844 kWh 2737 kWh 4106 kWh £687 £411 £1,098 £11,394 10.4 yrs £10,560
8 kW 7821 kWh 3129 kWh 4693 kWh £785 £469 £1,255 £13,022 10.4 yrs £12,069

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: £932, Upfront: £10,239, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1955 kWh 1173 kWh 782 kWh £294 £78 £373 £5,356 14.4 yrs £2,098
3 kW 2933 kWh 1760 kWh 1173 kWh £442 £117 £559 £6,983 12.5 yrs £4,197
4 kW 3911 kWh 2346 kWh 1564 kWh £589 £156 £745 £8,611 11.6 yrs £6,296
5 kW 4888 kWh 2933 kWh 1955 kWh £736 £196 £932 £10,239 11.0 yrs £8,396
6 kW 5866 kWh 3520 kWh 2346 kWh £883 £235 £1,118 £11,867 10.6 yrs £10,495
7 kW 6844 kWh 4106 kWh 2737 kWh £1,031 £274 £1,304 £13,494 10.3 yrs £12,594
8 kW 7821 kWh 4693 kWh 3129 kWh £1,178 £313 £1,491 £15,122 10.1 yrs £14,693

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: £1,006, Upfront: £11,639, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1955 kWh 1369 kWh 587 kWh £344 £59 £402 £6,756 16.8 yrs £1,289
3 kW 2933 kWh 2053 kWh 880 kWh £515 £88 £603 £8,383 13.9 yrs £3,683
4 kW 3911 kWh 2737 kWh 1173 kWh £687 £117 £804 £10,011 12.4 yrs £6,077
5 kW 4888 kWh 3422 kWh 1467 kWh £859 £147 £1,006 £11,639 11.6 yrs £8,472
6 kW 5866 kWh 4106 kWh 1760 kWh £1,031 £176 £1,207 £13,267 11.0 yrs £10,866
7 kW 6844 kWh 4791 kWh 2053 kWh £1,202 £205 £1,408 £14,894 10.6 yrs £13,261
8 kW 7821 kWh 5475 kWh 2346 kWh £1,374 £235 £1,609 £16,522 10.3 yrs £15,655

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: £1,028, Upfront: £13,389, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1955 kWh 1427 kWh 528 kWh £358 £53 £411 £8,506 20.7 yrs £-284
3 kW 2933 kWh 2141 kWh 792 kWh £537 £79 £617 £10,133 16.4 yrs £2,199
4 kW 3911 kWh 2855 kWh 1056 kWh £717 £106 £822 £11,761 14.3 yrs £4,682
5 kW 4888 kWh 3568 kWh 1320 kWh £896 £132 £1,028 £13,389 13.0 yrs £7,165
6 kW 5866 kWh 4282 kWh 1584 kWh £1,075 £158 £1,233 £15,017 12.2 yrs £9,648
7 kW 6844 kWh 4996 kWh 1848 kWh £1,254 £185 £1,439 £16,644 11.6 yrs £12,131
8 kW 7821 kWh 5710 kWh 2112 kWh £1,433 £211 £1,644 £18,272 11.1 yrs £14,614

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: £1,042, Upfront: £15,139, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1955 kWh 1467 kWh 489 kWh £368 £49 £417 £10,256 24.6 yrs £-1,916
3 kW 2933 kWh 2200 kWh 733 kWh £552 £73 £625 £11,883 19.0 yrs £626
4 kW 3911 kWh 2933 kWh 978 kWh £736 £98 £834 £13,511 16.2 yrs £3,168
5 kW 4888 kWh 3666 kWh 1222 kWh £920 £122 £1,042 £15,139 14.5 yrs £5,710
6 kW 5866 kWh 4400 kWh 1467 kWh £1,104 £147 £1,251 £16,767 13.4 yrs £8,252
7 kW 6844 kWh 5133 kWh 1711 kWh £1,288 £171 £1,459 £18,394 12.6 yrs £10,794
8 kW 7821 kWh 5866 kWh 1955 kWh £1,472 £196 £1,668 £20,022 12.0 yrs £13,336

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: £1,057, Upfront: £17,589, 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 1955 kWh 1506 kWh 450 kWh £378 £45 £423 £12,706 30.0 yrs £-4,248
3 kW 2933 kWh 2258 kWh 675 kWh £567 £67 £634 £14,333 22.6 yrs £-1,647
4 kW 3911 kWh 3011 kWh 899 kWh £756 £90 £846 £15,961 18.9 yrs £954
5 kW 4888 kWh 3764 kWh 1124 kWh £945 £112 £1,057 £17,589 16.6 yrs £3,555
6 kW 5866 kWh 4517 kWh 1349 kWh £1,134 £135 £1,269 £19,217 15.1 yrs £6,156
7 kW 6844 kWh 5270 kWh 1574 kWh £1,323 £157 £1,480 £20,844 14.1 yrs £8,757
8 kW 7821 kWh 6022 kWh 1799 kWh £1,512 £180 £1,692 £22,472 13.3 yrs £11,358

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 Milton Keynes

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 MK15

Figures below are tailored to MK15 — click through for full league tables.

Big-Roof Britain Rank #1581 of 2182
4.6 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1483 of 2996
10.4 years (UK avg 10.8 years)
~£784 /yr • £8,139 upfront
Standing-Charge Drag Rank #1418 of 2996
25.0% (UK avg 26.6%) drag on savings
£196 fixed • ~£784 /yr value
Aspect Penalty View ranking →
East −21.3% West −19.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in MK15

Monthly generation per kilowatt of solar panels

kWh 38 Jan 51 Feb 84 Mar 109 Apr 117 May 118 Jun 119 Jul 106 Aug 91 Sep 66 Oct 45 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.5% 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 81 kWh. So a typical 4 kW home system would generate roughly 165 kWh in winter, or 326 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
25.10p/kWh
Daily Fixed Charge
53.60p/day
Local Sunshine
978kWh/kW
A 1 kW system generates ~978 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: 69% • Flats: 22% • Bungalows: 9% Based on 1,524 properties

Coverage

Milton Keynes (100%)

Areas Covered

Campbell Park & Old Woughton, Broughton, Newport Pagnell South, Monkston

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 East Midlands

MK14 (Milton Keynes)
≈1.9 km away
Local sunshine: ~985 kWh/kWp · +1% vs MK15
MK98 (Milton Keynes)
≈2.2 km away
Local sunshine: ~982 kWh/kWp · +0% vs MK15
MK16 (Milton Keynes)
≈2.9 km away
Local sunshine: ~995 kWh/kWp · +2% vs MK15
MK9 (Milton Keynes)
≈3.0 km away
Local sunshine: ~985 kWh/kWp · +1% vs MK15
MK6 (Milton Keynes)
≈3.4 km away
Local sunshine: ~985 kWh/kWp · +1% vs MK15
MK10 (Milton Keynes)
≈3.8 km away
Local sunshine: ~985 kWh/kWp · +1% vs MK15

Similar sunshine across the UK

BA1 (Bath and North East Somerset)
~978 kWh/kWp · +0% vs MK15
DN39 (North Lincolnshire)
~978 kWh/kWp · -0% vs MK15
L38 (Sefton)
~978 kWh/kWp · -0% vs MK15