Hampshire
Solar panels in Southampton, sized to your roof.
About 6,870 kWh a year from 12 panels in Southampton, £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
Southampton's solar year
PVGIS puts Southampton at 1,080 kWh per kWp a year, 4% above our Hampshire 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 | 42.1 |
| February | 56.6 |
| March | 93.7 |
| April | 122 |
| May | 129 |
| June | 132 |
| July | 133 |
| August | 116 |
| September | 100 |
| October | 69 |
| November | 48.2 |
| December | 38 |
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 1,080, Southampton is 17% above it.
How Southampton compares
Southampton is classed as a city in the House of Commons Library settlement data, home to 260,184 people. It is one of 45 Hampshire towns we track, and it ranks 29th of 45 for solar yield. Its 1,080 kWh per kWp a year works out at 2.96 peak sun hours a day, and running the standard 12 panel model here splits the return into £247 of savings from generation you use yourself and £712 of export income at 12p, with about 5,932 kWh a year going to the grid.
These are starting numbers, not a quote. The calculator below opens on Southampton'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 in Southampton go to its own council, and the House of Commons Library classes it as a 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.
Generation is modelled from PVGIS satellite data for Southampton's own coordinates (50.91949, -1.39748), 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.
Who runs the grid in Southampton
On NESO's licence-area map, Southampton is in Southern England, which Scottish and Southern Electricity Networks (SSEN) operates. That makes SSEN the network operator for any system fitted here.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to SSEN within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
A bigger inverter or battery output needs a G99 application in advance. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW.
Sources: NESO DNO licence areas (3 May 2024); SSEN, micro-generation connections page, checked 25 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Southampton
A heat pump in Southampton
A heat pump does most of its work from November to February. Over those four months, 12 panels in Southampton make about 1,180 kWh, against 3,240 kWh from May to August, so winter heating runs mostly on grid electricity and the tariff matters more 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 Southampton
A 12-panel roof in Southampton makes about 840 kWh in July. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
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.
What else is true of Southampton
Southampton's Local Plan describes the city's housing as typically higher density and smaller than in many other areas, with a higher than average share of private rented homes, terraces and properties built before 1919. Much of the city centre was rebuilt in the mid-twentieth century after wartime bomb damage, so a Southampton roof is as likely to sit on a rebuilt mid-century terrace as on a pre-1919 original, and the two can behave quite differently for shading and pitch.
Southampton sits in SSEN territory, on its Southern Electric Power Distribution licence. SSEN's own G99 Fast Track aims to reply within 10 working days for eligible small-scale schemes, well inside the 45 working day industry standard, and most single home systems use the quicker 28-day G98 route instead. Southampton City Council is the planning authority; seven conservation areas, including The Avenue and Carlton Crescent, carry an Article 4 direction removing permitted development rights for roof-mounted solar, so the rest of the city keeps those rights as normal.
The council declared a climate emergency in 2019 and its Climate Change Strategy targets net zero for the whole city by 2035, with the council's own buildings and fleet reaching net zero by 2030. SSEN is separately investing £155 million in Southampton's electricity network between July 2025 and summer 2031, including a new Bulk Supply Point that will raise local capacity by around 180MVA to support more solar, heat pumps and electric vehicles.
Planning authority: Southampton City Council
Sources: southampton.gov.uk · southampton.gov.uk
Solar panel servicing and repair in Southampton
Faults, servicing and ageing inverters follow the same economics in Southampton as anywhere else, and the guides below price them plainly.
Southampton solar questions
What does a solar panel system produce in Southampton?
Each kWp of panels in Southampton makes 1,080 kWh a year on PVGIS figures, so a typical 12-panel system produces around 6,870 kWh, from about 240 kWh in December up to 840 kWh in July.
What would 12 solar panels cost in Southampton?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Southampton differs is output: about 6,870 kWh a year from that system.
Would a system in Southampton need approval from the network operator?
Southampton is on Scottish and Southern Electricity Networks' network (Southern England licence area). Systems up to 3.68kW per phase of inverter output follow G98: SSEN is notified within 28 days of commissioning, with no approval needed first. Anything larger needs a G99 application before installation. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW. Our G98 vs G99 guide explains both routes.
How much would export pay on a system in Southampton?
It is exported. With typical use and no battery, about 5,932 kWh of the 6,870 kWh a 12-panel system makes in Southampton goes to the grid, around £712 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Is solar worth it in Southampton in winter?
It works, but the year is lopsided. 68% of a Southampton roof's output lands between April and September; the four months from November to February give about 1,180 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
How Southampton compares with its neighbours
How the towns nearest Southampton compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Southampton |
|---|---|---|
| Southampton | 1,080 | this town |
| West End | 1,085 | +5 kWh |
| Hythe and Dibden Purlieu | 1,107 | +27 kWh |
| Hedge End | 1,084 | +4 kWh |
| Bursledon | 1,092 | +12 kWh |
| Eastleigh | 1,070 | −10 kWh |
| Totton | 1,073 | −7 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 Southampton: Solar panels in Southampton from OVO Solar & Battery
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Reading for Southampton homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
Microinverters, optimisers or a plain string inverter: who needs what
Shade and roof layout decide this. An honest triage of the three approaches.
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 →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 →Are air source heat pumps any good? What owners actually report
The UK's largest survey found 80% of heat pump owners satisfied, against 70% for gas boilers.
Read the guide →Which tariffs are actually built for battery charging
A battery buys cheap and uses dear. The tariff decides how much that is worth.
Read the guide →Your MCS certificate: what it shows, when it arrives, and how a Smart Export Guarantee supplier uses it
The document your export payments hang on. Who issues it, what it shows, and how to get a copy.
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.