Kent
Solar panels in Swanley, designed on a free call.
A 12-panel roof in Swanley makes about 6,570 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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How much a Swanley roof makes, month by month
From 37.2 kWh per kWp in December to 128 in July: a roof in Swanley makes 3.4 times as much in its best month as in its darkest, and 1,033 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 38.3 |
| February | 51.2 |
| March | 87.7 |
| April | 116 |
| May | 125 |
| June | 125 |
| July | 128 |
| August | 114 |
| September | 97.5 |
| October | 67.4 |
| November | 47.3 |
| December | 37.2 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Our GB average is 925 kWh per kWp a year, the mean of the 85 county PVGIS estimates we publish; at 1,033, Swanley is 12% above it.
How Swanley compares
Small towns rarely get published solar figures, so here are the numbers for Swanley. It is one of 44 Kent towns we track, and it ranks 42nd of 44 for solar yield, a town of 17,863 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,033 kWh per kWp a year, 2.83 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £923 of year one benefit, £247 of it from your own generation and £676 from export at 12p.
Treat these as calibration rather than a quote. The calculator below runs the same model, opened on Swanley's own yield, and prices a 12 panel system at £6,360 installed before any battery. Your free design call reworks every number for your actual roof, its shading and your usage.
Planning applications here go through Sevenoaks; nationally, the House of Commons Library classes Swanley as a small town.
The charger is in the installed price but left out of payback: charging savings depend on your mileage and tariff, which the design call models properly.
Your real roof and usage, worked through on a free 30-minute video call. Use the full form or leave three details below.
Price this for your roof
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
Generation is modelled from PVGIS satellite data for Swanley's own coordinates (51.39738, 0.17363), using the same 26.32p/kWh import value and £1,000 per kWp installed pricing as every Clearline estimate; the methodology is on our help page.
UK Power Networks and your Swanley connection
Swanley is served by UK Power Networks: the town's centre falls inside its South East England licence area on NESO's boundary map.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to UK Power Networks within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
Above that, G99 means applying before the work is booked. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator.
Sources: NESO DNO licence areas (3 May 2024); Ofgem, Distributed Generation Standards Direction guidance, checked 27 September 2026. G98 vs G99, explained.
Heat pumps and EV charging in Swanley
A heat pump in Swanley
Heating demand peaks when solar is weakest. In Swanley, a 12-panel system makes about 240 kWh in December and 240 kWh in January, a fraction of its 810 kWh in July, which is why a heat pump here is costed on its tariff first.
The Boiler Upgrade Scheme, open in England and Wales, takes £7,500 off an air source or ground source heat pump, or £2,500 off an air-to-air unit. Homes on oil or LPG with no mains gas get £1,500 more until March 2027 (gov.uk, checked 28 September 2026).
Charging an EV in Swanley
Swanley's July output, about 810 kWh from 12 panels, is several times the 70 kWh or so a typical home uses in daylight that month on our calculator's settings. Daytime charging turns that surplus into miles.
Renters and flat owners with private off-street parking can get 75% off a chargepoint and its installation, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above adds a 7.4kW smart charger from £1,100 installed.
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Swanley
The same sourced benchmarks apply in Swanley as everywhere we cover: honest repair pricing and what a service should include.
Solar in Swanley: your questions answered
How much electricity do solar panels make in Swanley?
About 6,570 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Swanley: 1,033 kWh per kWp, or 2.83 peak sun hours a day on average. July is the strongest month, at about 810 kWh.
Is solar more expensive in Swanley?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Swanley, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,570 kWh a year here, which is what drives payback.
Which DNO covers Swanley, and what does it need from me?
UK Power Networks covers Swanley. A home system of up to 3.68kW per phase is notified to UK Power Networks within 28 days of commissioning under G98, and nothing waits on approval. Larger outputs need a G99 application before work starts. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator.
What could I earn from exporting in Swanley?
On the 12p export scenario, a 12-panel system in Swanley sends about 5,633 kWh a year to the grid, worth around £676. The export rates table compares what each supplier pays.
How much solar does Swanley get in December?
December is the low point: about 240 kWh from a 12-panel system in Swanley, on PVGIS data, rising to 810 kWh in July. From November to February the same system makes about 1,110 kWh in total, which is why a battery charged off-peak does more of the work in winter.
How Swanley compares with its neighbours
Same satellite dataset, same assumptions, so the differences are real geography rather than modelling noise.
| Town | kWh per kWp a year | vs Swanley |
|---|---|---|
| Swanley | 1,033 | this town |
| Dartford | 1,039 | +6 kWh |
| Bexley | 1,042 | +9 kWh |
| Bromley | 1,023 | −10 kWh |
| Longfield, New Ash Green and Hartley | 1,049 | +16 kWh |
| Swanscombe | 1,041 | +8 kWh |
| Chafford Hundred, West Thurrock and Purfleet-on-Thames | 1,052 | +19 kWh |
Same PVGIS v5.2 query for every town. Small differences are within year-to-year weather; more than about 30 kWh per kWp apart is geography.
Also for Swanley: Solar panels in Swanley from OVO Solar & Battery
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Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Further reading for Swanley
Sourced, dated and written by us. The same ground we cover on your free call.
Aiko vs LONGi for a UK roof: Neostar 3 or Hi-MO X10?
Datasheet against datasheet, with a verdict by roof type and the warranty by series.
Read the guide →Which battery size band does your home fall into?
Where UK homes actually land, why oversizing costs you, and what shifts the band.
Read the guide →Smart charge point regulations, explained
Why your charger arrives pre-set to charge overnight, and why it waits before it starts.
Read the guide →Heat pump running costs versus a gas boiler, assumptions shown
Four numbers decide it: seasonal efficiency, flow temperature, tariff and heat demand.
Read the guide →Choosing a tariff when you have solar, a battery and an EV
Solar, battery and EV want different tariffs. How to work out which one to protect.
Read the guide →HIES explained: what the badge actually protects, and when
What HIES protects: deposits up to 25 percent capped at 5,000 pounds, and your workmanship guarantee.
Read the guide →Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.