Surrey
Solar panels in Merton, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,500 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
Get my free quote
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.
or call 07782 219224
- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
How much a Merton roof makes, month by month
PVGIS puts Merton at 1,022 kWh per kWp a year, level with our Surrey county estimate. 68% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.2 |
| February | 51.5 |
| March | 87.5 |
| April | 116 |
| May | 122 |
| June | 123 |
| July | 126 |
| August | 111 |
| September | 96.3 |
| October | 67.5 |
| November | 46.2 |
| December | 36.5 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Against Great Britain as a whole: Merton makes 1,022 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Merton is 10% above it.
How Merton compares
Merton is one of 47 Surrey towns we track, and it ranks 30th of 47 for solar yield. The House of Commons Library settlement classification puts it in the core city class, with a population of 218,312, which makes it one of the largest places we publish figures for. Scale changes nothing about the physics: PVGIS gives a roof here 1,022 kWh per kWp a year, 2.80 peak sun hours a day averaged across the seasons, and on the 12p scenario about £247 of the year one benefit comes from solar you use yourself, with export income adding £668.
Every figure here assumes a clear, south-facing roof at 35 degrees. Yours will differ, which is what the free design call is for; until then, the calculator below tests panels, batteries and export rates on Merton's own yield.
Merton is its own local planning authority area, and its House of Commons Library settlement class is core city.
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 Merton at 51.40963, -0.19494 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
UK Power Networks and your Merton connection
Merton sits in UK Power Networks' London licence area, so UK Power Networks is the network operator (DNO) any solar panels or battery here are registered with.
Below 3.68kW per phase of inverter and battery output, the G98 route applies: the installation is notified to UK Power Networks within 28 days of commissioning, with no prior approval.
Larger systems go through G99 instead, applied for before installation. On timing: 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.
Beyond the panels: heating and car charging in Merton
A heat pump in Merton
Heating demand peaks when solar is weakest. In Merton, a 12-panel system makes about 230 kWh in December and 250 kWh in January, a fraction of its 800 kWh in July, which is why a heat pump here is costed on its tariff first.
In England, the Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump and £2,500 towards an air-to-air one, with £1,500 more until March 2027 for homes heated by oil or LPG with no mains gas (gov.uk, checked 28 September 2026).
Charging an EV in Merton
Summer is where a car earns its place. In July, 12 panels in Merton make about 800 kWh, against roughly 70 kWh a typical home uses in daylight that month on our calculator's typical-use settings, so there is surplus a smart charger can put into the car instead of exporting it.
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.
The packages, priced before anyone visits
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Merton
The same sourced benchmarks apply in Merton as everywhere we cover: honest repair pricing and what a service should include.
Solar in Merton: your questions answered
How much electricity do solar panels make in Merton?
About 6,500 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Merton: 1,022 kWh per kWp, or 2.80 peak sun hours a day on average. July is the strongest month, at about 800 kWh.
What does a typical solar system cost in Merton?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Merton, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,500 kWh a year. The final figure comes from your roof on the design call.
Which DNO covers Merton, and what does it need from me?
UK Power Networks covers Merton. 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 happens to the solar I do not use in Merton?
Around £668 a year at 12p per kWh, for the roughly 5,563 kWh a 12-panel system in Merton exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How much solar does Merton get in December?
December is the low point: about 230 kWh from a 12-panel system in Merton, on PVGIS data, rising to 800 kWh in July. From November to February the same system makes about 1,100 kWh in total, which is why a battery charged off-peak does more of the work in winter.
How Merton compares with its neighbours
How the towns nearest Merton compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Merton |
|---|---|---|
| Merton | 1,022 | this town |
| Wandsworth | 1,030 | +8 kWh |
| Sutton | 1,015 | −7 kWh |
| Worcester Park and Stoneleigh | 1,017 | −5 kWh |
| Kingston upon Thames | 1,018 | −4 kWh |
| Lambeth | 1,028 | +6 kWh |
| Ewell | 1,017 | −5 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 Merton: Solar panels in Merton from OVO Solar & Battery
Also near Merton
See a number before you speak to anyone
Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Reading for Merton homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
G98 vs G99: the 28-day form and the eight-week wait, in plain English
One number on your quote decides between a formality and an eight week wait.
Read the guide →What a battery gateway actually does
Without a gateway your system shuts down when the grid does. Here is what the box actually does.
Read the guide →Home EV charger types and speeds, explained properly
Granny cable, 7kW wall unit or 22kW three phase. What each adds per hour, and which you need.
Read the guide →Do you need to replace your radiators for a heat pump?
Some change, most do not. The room by room arithmetic that decides which.
Read the guide →Why the best export rates always carry conditions
The top export rates are acquisition offers. Here is how to price the condition.
Read the guide →MCS, HIES, RECC, NAPIT, TrustMark and Flexi-Orb: which badge does what
Six logos, six different jobs. What each scheme covers, and which are actually required.
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.