Lancashire
Solar panels in Darwen, designed on a free call.
Twelve panels (6.36 kWp) here make about 5,580 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
Sunlight in Darwen, in numbers
From 22.3 kWh per kWp in December to 117.2 in May: a roof in Darwen makes 5.3 times as much in its best month as in its darkest, and 878 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 24.8 |
| February | 44.8 |
| March | 78.1 |
| April | 105 |
| May | 117 |
| June | 110 |
| July | 111 |
| August | 97.1 |
| September | 80.1 |
| October | 52.2 |
| November | 35.5 |
| December | 22.3 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 878 kWh per kWp in Darwen against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Darwen 5% below it.
How Darwen compares
Among the places we publish figures for, Darwen is one of 109 Lancashire towns we track, and it ranks joint 81st of 109 for solar yield. It is a medium town in the House of Commons Library classification, with 28,246 residents, and its roofs see 2.41 peak sun hours a day across the year. That drives the standard 12 panel model to 5,584 kWh of generation, of which around 4,647 kWh is exported at 12p for £558 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
These are starting numbers, not a quote. The calculator below opens on Darwen's own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Planning applications here go through Blackburn with Darwen; nationally, the House of Commons Library classes Darwen as a medium 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.
Modelled for Darwen at 53.69745, -2.46668 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
Electricity North West and your Darwen connection
Darwen sits in Electricity North West's North West England licence area, so Electricity North West is the network operator (DNO) any solar panels or battery here are registered with.
G98 is the simple route. If the inverter, plus any battery, stays at or under 3.68kW per phase, Electricity North West only has to be told within 28 days after the system is commissioned.
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 Electricity North West 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.
Adding a heat pump or an EV charger in Darwen
A heat pump in Darwen
In December, the darkest month here, 12 panels in Darwen make about 140 kWh. That is when a heat pump runs hardest, so its running cost in Darwen comes down to the tariff and the flow temperature rather than the roof.
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 Darwen
Darwen's May output, about 750 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 Darwen
The same sourced benchmarks apply in Darwen as everywhere we cover: honest repair pricing and what a service should include.
Common questions about solar in Darwen
How much electricity do solar panels make in Darwen?
About 5,580 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Darwen: 878 kWh per kWp, or 2.41 peak sun hours a day on average. May is the strongest month, at about 750 kWh.
Is solar more expensive in Darwen?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Darwen, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 5,580 kWh a year here, which is what drives payback.
Which DNO covers Darwen, and what does it need from me?
Electricity North West covers Darwen. A home system of up to 3.68kW per phase is notified to Electricity North West 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 Electricity North West as it does every network operator.
What could I earn from exporting in Darwen?
On the 12p export scenario, a 12-panel system in Darwen sends about 4,647 kWh a year to the grid, worth around £558. The export rates table compares what each supplier pays.
How much solar does Darwen get in December?
December is the low point: about 140 kWh from a 12-panel system in Darwen, on PVGIS data, rising to 750 kWh in May. From November to February the same system makes about 810 kWh in total, which is why a battery charged off-peak does more of the work in winter.
How Darwen 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 Darwen |
|---|---|---|
| Darwen | 878 | this town |
| Blackburn | 875 | −3 kWh |
| Oswaldtwistle | 876 | −2 kWh |
| Accrington | 875 | −3 kWh |
| Haslingden | 881 | +3 kWh |
| Clayton-le-Moors | 874 | −4 kWh |
| Great Harwood | 872 | −6 kWh |
Each row is a PVGIS v5.2 run at that town's centre with the same settings. Treat gaps of a few kWh as noise and gaps over about 30 kWh per kWp as real differences in sunshine.
Also for Darwen: Solar panels in Darwen from OVO Solar & Battery
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Further reading for Darwen
Sourced, dated and written by us. The same ground we cover on your free call.
Why your inverter is smaller than your panel array, and why that is correct
More panel capacity than inverter capacity is a deliberate design choice.
Read the guide →Tesla Powerwall 3 vs Duracell Dura16: which fits your home?
The two packages we actually price, compared on the numbers that decide it.
Read the guide →How solar aware EV charging actually works
The CT clamp, the surplus tracking and the 1.4kW floor that catches people out.
Read the guide →Are heat pumps worth it? The real 2026 numbers
Electricity costs 3.3x gas per kWh. A heat pump is about 3x as efficient. The numbers nearly cancel out.
Read the guide →Why tariff choice moves payback more than kit choice
Identical kit, five times the export income. The tariff decision worked through with August 2026 rates.
Read the guide →How to check an MCS certificate is genuine, before the deposit leaves your account
A logo proves nothing. Certification is business specific, technology specific and checkable.
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.