Hampshire
Solar panels in Portsmouth, priced before anyone visits.
A 12-panel roof in Portsmouth makes about 7,150 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Sunlight in Portsmouth, in numbers
From 39 kWh per kWp in December to 141 in July: a roof in Portsmouth makes 3.6 times as much in its best month as in its darkest, and 1,124 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 41.5 |
| February | 58.4 |
| March | 97.6 |
| April | 128 |
| May | 136 |
| June | 140 |
| July | 141 |
| August | 121 |
| September | 103 |
| October | 70.5 |
| November | 49.1 |
| December | 39 |
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: Portsmouth makes 1,124 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Portsmouth is 22% above it.
How Portsmouth compares
Portsmouth is classed as a city in the House of Commons Library settlement data, home to 230,389 people. It is one of 45 Hampshire towns we track, and it ranks joint 12th of 45 for solar yield. Its 1,124 kWh per kWp a year works out at 3.08 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 £745 of export income at 12p, with about 6,212 kWh a year going to the grid.
These are starting numbers, not a quote. The calculator below opens on Portsmouth'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.
Portsmouth is its own local planning authority area, and its House of Commons Library settlement class is 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 Portsmouth at 50.82092, -1.07782 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
SSEN and your Portsmouth connection
On NESO's licence-area map, Portsmouth is in Southern England, which Scottish and Southern Electricity Networks (SSEN) operates. That makes SSEN the network operator for any system fitted here.
Below 3.68kW per phase of inverter and battery output, the G98 route applies: the installation is notified to SSEN within 28 days of commissioning, with no prior approval.
Larger systems go through G99 instead, applied for before installation. On timing: 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 Portsmouth
A heat pump in Portsmouth
In December, the darkest month here, 12 panels in Portsmouth make about 250 kWh. That is when a heat pump runs hardest, so its running cost in Portsmouth 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 Portsmouth
Summer is where a car earns its place. In July, 12 panels in Portsmouth make about 900 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 Portsmouth
If a system in Portsmouth is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Portsmouth solar questions
How much energy would 12 solar panels make in Portsmouth?
Portsmouth averages 3.08 peak sun hours a day, which PVGIS turns into 1,124 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 7,150 kWh, 68% of it between April and September.
What does a typical solar system cost in Portsmouth?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Portsmouth, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 7,150 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in Portsmouth, and do I need a G99 application?
The operator is Scottish and Southern Electricity Networks (SSEN). 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. 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. Your design call checks which route yours needs.
What happens to the solar I do not use in Portsmouth?
Around £745 a year at 12p per kWh, for the roughly 6,212 kWh a 12-panel system in Portsmouth exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How does solar perform in Portsmouth in the winter months?
December is the weakest month in Portsmouth: about 250 kWh from 12 panels, against 900 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Portsmouth compares with its neighbours
How the towns nearest Portsmouth compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Portsmouth |
|---|---|---|
| Portsmouth | 1,124 | this town |
| Gosport | 1,116 | −8 kWh |
| Waterlooville | 1,125 | +1 kWh |
| Havant | 1,133 | +9 kWh |
| South Hayling | 1,127 | +3 kWh |
| Fareham | 1,117 | −7 kWh |
| Lee-on-the-Solent | 1,104 | −20 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 Portsmouth: Solar panels in Portsmouth from OVO Solar & Battery
Also near Portsmouth
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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.
Reading for Portsmouth homeowners
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 →Adding a battery to solar panels you already own
Retrofitting a battery to working solar is straightforward. The paperwork is where people trip up.
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 →EV tariffs compared: the cheapest overnight windows
Overnight rates of 6.99p to 9p against a 26.32p capped average, compared.
Read the guide →G98 or G99: which one applies, what the application involves, and how long it takes
The G98 line sits at 3.68kW per phase. Above it, your network operator has to say yes first.
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.