Somerset
Solar panels in Portishead, designed on a free call.
About 6,480 kWh a year from 12 panels in Portishead, £6,360 installed, with your system designed 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 Portishead, in numbers
Portishead's best month is May, at 127.3 kWh per kWp; December manages 31.6. Over the year that comes to 1,019 kWh per kWp, 2% below our Somerset county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 35.6 |
| February | 53.3 |
| March | 88.5 |
| April | 120 |
| May | 127 |
| June | 124 |
| July | 127 |
| August | 110 |
| September | 95.6 |
| October | 64.7 |
| November | 42 |
| December | 31.6 |
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: Portishead makes 1,019 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Portishead is 10% above it.
How Portishead compares
Among the places we publish figures for, Portishead is one of 21 Somerset towns we track, and it ranks 12th of 21 for solar yield. It is a medium town in the House of Commons Library classification, with 26,542 residents, and its roofs see 2.79 peak sun hours a day across the year. That drives the standard 12 panel model to 6,481 kWh of generation, of which around 5,544 kWh is exported at 12p for £665 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 Portishead'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 North Somerset; nationally, the House of Commons Library classes Portishead 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.
The figures use PVGIS for the centre of Portishead (51.4819, -2.77586), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
The network operator for Portishead
Portishead is served by National Grid Electricity Distribution (NGED): the town's centre falls inside its South West 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 NGED 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. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late.
Sources: NESO DNO licence areas (3 May 2024); NGED, guaranteed standards of performance table, checked 25 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Portishead
A heat pump in Portishead
In December, the darkest month here, 12 panels in Portishead make about 200 kWh. That is when a heat pump runs hardest, so its running cost in Portishead comes down to the tariff and the flow temperature rather than the roof.
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 Portishead
Portishead's May 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.
If you rent, or own a flat, and have private off-street parking, the government chargepoint grant covers 75% of the cost, capped at £500 a socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above prices 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 Portishead
If a system in Portishead is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Common questions about solar in Portishead
How much energy would 12 solar panels make in Portishead?
Portishead averages 2.79 peak sun hours a day, which PVGIS turns into 1,019 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,480 kWh, 69% of it between April and September.
Is solar more expensive in Portishead?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Portishead, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,480 kWh a year here, which is what drives payback.
Who is the network operator in Portishead, and do I need a G99 application?
The operator is National Grid Electricity Distribution (NGED). Most home systems use the G98 route, a notification within 28 days of switch-on for up to 3.68kW per phase, so nothing waits on the network. Above that, G99 applies and has to be granted first. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. Your design call checks which route yours needs.
What could I earn from exporting in Portishead?
On the 12p export scenario, a 12-panel system in Portishead sends about 5,544 kWh a year to the grid, worth around £665. The export rates table compares what each supplier pays.
How does solar perform in Portishead in the winter months?
December is the weakest month in Portishead: about 200 kWh from 12 panels, against 810 kWh in May. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Portishead 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 Portishead |
|---|---|---|
| Portishead | 1,019 | this town |
| Nailsea | 1,014 | −5 kWh |
| Clevedon | 1,045 | +26 kWh |
| Yatton | 1,016 | −3 kWh |
| Caldicot | 1,023 | +4 kWh |
| Bristol | 1,021 | +2 kWh |
| Patchway | 1,013 | −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 Portishead: Solar panels in Portishead from OVO Solar & Battery
Also near Portishead
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Further reading for Portishead
Sourced, dated and written by us. The same ground we cover on your free call.
Back contact solar panels, explained for a UK roof
What back contact changes on a roof, compared fairly with TOPCon, with the makers' own claims labelled.
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 →How time of use charging windows actually work
How a cheap overnight window is metered and billed, and what a battery does inside it.
Read the guide →What MCS certification actually buys you on a heat pump job
The gate on the £7,500 grant, the design standard behind your running costs, and the noise sign-off.
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.