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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in NN15 (North Northamptonshire)

See if solar pays off for you in North Northamptonshire — price, savings and payback in under a minute (official UK data).

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
12.6 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£808
What you save every year
Profit Over 25 Years
£10,035
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 East Midlands, the current unit rate is 25.55p/kWh with a 49.09p/day standing charge. Your postcode’s south-facing sunshine yield is 997 kWh/kW — 28 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 997 kWh per year on a south-facing roof. We value self-used electricity at 25.6p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.6p/kWh
Standing charge
49.1p/day
Sunshine yield (south)
997 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: £808, Upfront: £10,173, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 797 kWh 1196 kWh £204 £120 £323 £4,069 12.6 yrs £2,397
3 kW 2990 kWh 1196 kWh 1794 kWh £306 £179 £485 £6,104 12.6 yrs £3,596
4 kW 3987 kWh 1595 kWh 2392 kWh £407 £239 £647 £8,138 12.6 yrs £4,795
5 kW 4983 kWh 1993 kWh 2990 kWh £509 £299 £808 £10,173 12.6 yrs £5,994
6 kW 5980 kWh 2392 kWh 3588 kWh £611 £359 £970 £12,207 12.6 yrs £7,192
7 kW 6977 kWh 2791 kWh 4186 kWh £713 £419 £1,132 £14,242 12.6 yrs £8,391
8 kW 7973 kWh 3189 kWh 4784 kWh £815 £478 £1,293 £16,276 12.6 yrs £9,590

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: £963, Upfront: £12,273, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1196 kWh 797 kWh £306 £80 £385 £6,169 16.0 yrs £1,537
3 kW 2990 kWh 1794 kWh 1196 kWh £458 £120 £578 £8,204 14.2 yrs £3,356
4 kW 3987 kWh 2392 kWh 1595 kWh £611 £159 £771 £10,238 13.3 yrs £5,175
5 kW 4983 kWh 2990 kWh 1993 kWh £764 £199 £963 £12,273 12.7 yrs £6,993
6 kW 5980 kWh 3588 kWh 2392 kWh £917 £239 £1,156 £14,307 12.4 yrs £8,812
7 kW 6977 kWh 4186 kWh 2791 kWh £1,070 £279 £1,349 £16,342 12.1 yrs £10,631
8 kW 7973 kWh 4784 kWh 3189 kWh £1,222 £319 £1,541 £18,376 11.9 yrs £12,449

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: £1,041, Upfront: £13,673, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1395 kWh 598 kWh £357 £60 £416 £7,569 18.2 yrs £757
3 kW 2990 kWh 2093 kWh 897 kWh £535 £90 £624 £9,604 15.4 yrs £2,886
4 kW 3987 kWh 2791 kWh 1196 kWh £713 £120 £833 £11,638 14.0 yrs £5,014
5 kW 4983 kWh 3488 kWh 1495 kWh £891 £150 £1,041 £13,673 13.1 yrs £7,143
6 kW 5980 kWh 4186 kWh 1794 kWh £1,070 £179 £1,249 £15,707 12.6 yrs £9,272
7 kW 6977 kWh 4884 kWh 2093 kWh £1,248 £209 £1,457 £17,742 12.2 yrs £11,400
8 kW 7973 kWh 5581 kWh 2392 kWh £1,426 £239 £1,665 £19,776 11.9 yrs £13,529

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: £1,064, Upfront: £15,423, 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 1993 kWh 1455 kWh 538 kWh £372 £54 £426 £9,319 21.9 yrs £-807
3 kW 2990 kWh 2183 kWh 807 kWh £558 £81 £638 £11,354 17.8 yrs £1,415
4 kW 3987 kWh 2910 kWh 1076 kWh £744 £108 £851 £13,388 15.7 yrs £3,636
5 kW 4983 kWh 3638 kWh 1346 kWh £929 £135 £1,064 £15,423 14.5 yrs £5,858
6 kW 5980 kWh 4365 kWh 1615 kWh £1,115 £161 £1,277 £17,457 13.7 yrs £8,080
7 kW 6977 kWh 5093 kWh 1884 kWh £1,301 £188 £1,490 £19,492 13.1 yrs £10,301
8 kW 7973 kWh 5821 kWh 2153 kWh £1,487 £215 £1,702 £21,526 12.6 yrs £12,523

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: £1,080, Upfront: £17,173, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1495 kWh 498 kWh £382 £50 £432 £11,069 25.6 yrs £-2,433
3 kW 2990 kWh 2243 kWh 748 kWh £573 £75 £648 £13,104 20.2 yrs £-149
4 kW 3987 kWh 2990 kWh 997 kWh £764 £100 £864 £15,138 17.5 yrs £2,134
5 kW 4983 kWh 3738 kWh 1246 kWh £955 £125 £1,080 £17,173 15.9 yrs £4,418
6 kW 5980 kWh 4485 kWh 1495 kWh £1,146 £150 £1,295 £19,207 14.8 yrs £6,702
7 kW 6977 kWh 5233 kWh 1744 kWh £1,337 £174 £1,511 £21,242 14.1 yrs £8,985
8 kW 7973 kWh 5980 kWh 1993 kWh £1,528 £199 £1,727 £23,276 13.5 yrs £11,269

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: £1,095, Upfront: £19,623, Break-even: 17.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1535 kWh 458 kWh £392 £46 £438 £13,519 30.9 yrs £-4,759
3 kW 2990 kWh 2302 kWh 688 kWh £588 £69 £657 £15,554 23.7 yrs £-2,413
4 kW 3987 kWh 3070 kWh 917 kWh £784 £92 £876 £17,588 20.1 yrs £-68
5 kW 4983 kWh 3837 kWh 1146 kWh £980 £115 £1,095 £19,623 17.9 yrs £2,278
6 kW 5980 kWh 4605 kWh 1375 kWh £1,176 £138 £1,314 £21,657 16.5 yrs £4,624
7 kW 6977 kWh 5372 kWh 1605 kWh £1,373 £160 £1,533 £23,692 15.5 yrs £6,969
8 kW 7973 kWh 6140 kWh 1834 kWh £1,569 £183 £1,752 £25,726 14.7 yrs £9,315

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 NN15

Figures below are tailored to NN15 — click through for full league tables.

Big-Roof Britain Rank #936 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1242 of 2997
11.0 years (UK avg 11.3 years)
~£925 /yr • £10,173 upfront
Standing-Charge Drag Rank #1274 of 2997
19.4% (UK avg 21.7%) drag on savings
£179 fixed • ~£925 /yr value

Your Area at a Glance

Your Electricity Rate
25.55p/kWh
Daily Fixed Charge
49.09p/day
Local Sunshine
997kWh/kW
A 1 kW system generates ~997 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: 79% • Flats: 11% • Bungalows: 9% Based on 10,881 properties

Coverage

North Northamptonshire (100%)

Areas Covered

Barton Seagrave & Burton Latimer, Ise, St Michael, Pipers Hill, Kettering Central, St Peter, Rothwell & Mawsley

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q4 2025

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 East Midlands

NN16 (North Northamptonshire)
≈2.1 km away
Local sunshine: ~995 kWh/kWp · -0% vs NN15
NN14 (North Northamptonshire)
≈4.0 km away
Local sunshine: ~997 kWh/kWp · +0% vs NN15
NN9 (North Northamptonshire)
≈9.2 km away
Local sunshine: ~995 kWh/kWp · -0% vs NN15
NN8 (North Northamptonshire)
≈9.7 km away
Local sunshine: ~995 kWh/kWp · -0% vs NN15
NN18 (North Northamptonshire)
≈10.2 km away
Local sunshine: ~992 kWh/kWp · -0% vs NN15
NN17 (North Northamptonshire)
≈12.1 km away
Local sunshine: ~995 kWh/kWp · -0% vs NN15

Similar sunshine across the UK

GU5 (Guildford)
~997 kWh/kWp · -0% vs NN15
NP18 (Newport)
~997 kWh/kWp · +0% vs NN15
GU23 (Guildford)
~997 kWh/kWp · -0% vs NN15