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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PE9 (South Kesteven)

See if solar pays off for you in South Kesteven — 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
12.5 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£817
What you save every year
Profit Over 25 Years
£10,243
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 1007 kWh/kW — 39 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 1007 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)
1007 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: £817, Upfront: £10,173, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2014 kWh 806 kWh 1208 kWh £206 £121 £327 £4,069 12.5 yrs £2,464
3 kW 3021 kWh 1208 kWh 1813 kWh £309 £181 £490 £6,104 12.5 yrs £3,696
4 kW 4028 kWh 1611 kWh 2417 kWh £412 £242 £653 £8,138 12.5 yrs £4,928
5 kW 5035 kWh 2014 kWh 3021 kWh £515 £302 £817 £10,173 12.5 yrs £6,160
6 kW 6042 kWh 2417 kWh 3625 kWh £617 £363 £980 £12,207 12.5 yrs £7,392
7 kW 7049 kWh 2819 kWh 4229 kWh £720 £423 £1,143 £14,242 12.5 yrs £8,624
8 kW 8056 kWh 3222 kWh 4833 kWh £823 £483 £1,307 £16,276 12.5 yrs £9,856

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: £973, Upfront: £12,273, 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 2014 kWh 1208 kWh 806 kWh £309 £81 £389 £6,169 15.8 yrs £1,617
3 kW 3021 kWh 1813 kWh 1208 kWh £463 £121 £584 £8,204 14.0 yrs £3,475
4 kW 4028 kWh 2417 kWh 1611 kWh £617 £161 £779 £10,238 13.1 yrs £5,333
5 kW 5035 kWh 3021 kWh 2014 kWh £772 £201 £973 £12,273 12.6 yrs £7,192
6 kW 6042 kWh 3625 kWh 2417 kWh £926 £242 £1,168 £14,307 12.3 yrs £9,050
7 kW 7049 kWh 4229 kWh 2819 kWh £1,081 £282 £1,363 £16,342 12.0 yrs £10,909
8 kW 8056 kWh 4833 kWh 3222 kWh £1,235 £322 £1,557 £18,376 11.8 yrs £12,767

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: £1,052, Upfront: £13,673, 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 2014 kWh 1410 kWh 604 kWh £360 £60 £421 £7,569 18.0 yrs £843
3 kW 3021 kWh 2115 kWh 906 kWh £540 £91 £631 £9,604 15.2 yrs £3,015
4 kW 4028 kWh 2819 kWh 1208 kWh £720 £121 £841 £11,638 13.8 yrs £5,186
5 kW 5035 kWh 3524 kWh 1510 kWh £900 £151 £1,052 £13,673 13.0 yrs £7,358
6 kW 6042 kWh 4229 kWh 1813 kWh £1,081 £181 £1,262 £15,707 12.4 yrs £9,529
7 kW 7049 kWh 4934 kWh 2115 kWh £1,261 £211 £1,472 £17,742 12.1 yrs £11,701
8 kW 8056 kWh 5639 kWh 2417 kWh £1,441 £242 £1,682 £19,776 11.8 yrs £13,872

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: £1,075, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2014 kWh 1470 kWh 544 kWh £376 £54 £430 £9,319 21.7 yrs £-719
3 kW 3021 kWh 2205 kWh 816 kWh £563 £82 £645 £11,354 17.6 yrs £1,546
4 kW 4028 kWh 2940 kWh 1088 kWh £751 £109 £860 £13,388 15.6 yrs £3,812
5 kW 5035 kWh 3675 kWh 1359 kWh £939 £136 £1,075 £15,423 14.3 yrs £6,077
6 kW 6042 kWh 4410 kWh 1631 kWh £1,127 £163 £1,290 £17,457 13.5 yrs £8,343
7 kW 7049 kWh 5146 kWh 1903 kWh £1,315 £190 £1,505 £19,492 13.0 yrs £10,608
8 kW 8056 kWh 5881 kWh 2175 kWh £1,502 £218 £1,720 £21,526 12.5 yrs £12,874

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: £1,091, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2014 kWh 1510 kWh 503 kWh £386 £50 £436 £11,069 25.4 yrs £-2,344
3 kW 3021 kWh 2266 kWh 755 kWh £579 £76 £654 £13,104 20.0 yrs £-16
4 kW 4028 kWh 3021 kWh 1007 kWh £772 £101 £873 £15,138 17.3 yrs £2,312
5 kW 5035 kWh 3776 kWh 1259 kWh £965 £126 £1,091 £17,173 15.7 yrs £4,641
6 kW 6042 kWh 4531 kWh 1510 kWh £1,158 £151 £1,309 £19,207 14.7 yrs £6,969
7 kW 7049 kWh 5286 kWh 1762 kWh £1,351 £176 £1,527 £21,242 13.9 yrs £9,297
8 kW 8056 kWh 6042 kWh 2014 kWh £1,544 £201 £1,745 £23,276 13.3 yrs £11,625

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: £1,106, Upfront: £19,623, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2014 kWh 1551 kWh 463 kWh £396 £46 £443 £13,519 30.5 yrs £-4,669
3 kW 3021 kWh 2326 kWh 695 kWh £594 £69 £664 £15,554 23.4 yrs £-2,278
4 kW 4028 kWh 3101 kWh 926 kWh £792 £93 £885 £17,588 19.9 yrs £113
5 kW 5035 kWh 3877 kWh 1158 kWh £991 £116 £1,106 £19,623 17.7 yrs £2,504
6 kW 6042 kWh 4652 kWh 1390 kWh £1,189 £139 £1,328 £21,657 16.3 yrs £4,894
7 kW 7049 kWh 5427 kWh 1621 kWh £1,387 £162 £1,549 £23,692 15.3 yrs £7,285
8 kW 8056 kWh 6203 kWh 1853 kWh £1,585 £185 £1,770 £25,726 14.5 yrs £9,676

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 PE9

Figures below are tailored to PE9 — click through for full league tables.

Big-Roof Britain Rank #1022 of 2182
5.0 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1170 of 2997
10.9 years (UK avg 11.3 years)
~£934 /yr • £10,173 upfront
Standing-Charge Drag Rank #1247 of 2997
19.2% (UK avg 21.7%) drag on savings
£179 fixed • ~£934 /yr value

Your Area at a Glance

Your Electricity Rate
25.55p/kWh
Daily Fixed Charge
49.09p/day
Local Sunshine
1007kWh/kW
A 1 kW system generates ~1007 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: 76% • Flats: 15% • Bungalows: 8% Based on 9,490 properties

Coverage

South Kesteven (70%)|Rutland (16%)|Peterborough (9%)|North Northamptonshire (6%)

Areas Covered

Stamford St Mary's, Stamford St George's, Stamford St John's, Ryhall & Casterton, Stamford All Saints, Barnack, Ketton, Oundle + 4 more

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

PE6 (Peterborough)
≈13.1 km away
Local sunshine: ~1,010 kWh/kWp · +0% vs PE9
PE10 (South Kesteven)
≈14.6 km away
Local sunshine: ~1,004 kWh/kWp · -0% vs PE9
PE8 (North Northamptonshire)
≈16.1 km away
Local sunshine: ~1,009 kWh/kWp · +0% vs PE9
LE15 (Rutland)
≈16.7 km away
Local sunshine: ~985 kWh/kWp · -2% vs PE9
NG33 (South Kesteven)
≈19.4 km away
Local sunshine: ~1,000 kWh/kWp · -1% vs PE9
NN17 (North Northamptonshire)
≈22.1 km away
Local sunshine: ~995 kWh/kWp · -1% vs PE9

Similar sunshine across the UK

UB7 (Hillingdon)
~1,007 kWh/kWp · -0% vs PE9
MK44 (Bedford)
~1,007 kWh/kWp · -0% vs PE9
SL3 (Slough)
~1,007 kWh/kWp · +0% vs PE9