Solar Panels Portsmouth: Costs, Savings & Local Data
How much can solar panels save you in Portsmouth?
A typical 4kW solar panel system in Portsmouth generates around 4,200 kWh per year, saving you approximately £643 annually on electricity bills and export payments. With 1,750 hours of sunshine per year, most Portsmouth homeowners see payback within 10–13 years.
Portsmouth receives around 1,750 hours of sunshine each year. A typical 4kW solar panel system here can generate approximately 4,200 kWh annually, providing meaningful savings on your electricity bills and reducing your household's carbon footprint.
Portsmouth receives around 1,750 hours of sunshine per year, making it one of England's sunnier cities. Portsea Island's flat, south-facing aspect gives solar panels an excellent opportunity to perform at their best. The city's housing ranges from the dense Victorian terraces of Southsea to post-war semis in Cosham and Drayton, and most properties have sufficient roof space for a worthwhile solar installation.
Solar panel key figures for Portsmouth
1,750 hrs
Annual sunshine hours
HSG regional figure — no primary source recorded
4,200 kWh
Annual generation (4kW)
Based on 1050 kWh/kWp yield
£643
Annual savings (4kW)
At 26.11p/kWh + SEG
~11 years
Estimated payback
£7,120 national DESNZ median, not a Portsmouth price
Solar panel output and savings by system size in Portsmouth
Generation and savings below are modelled for Portsmouth's location, using a regional solar yield of 1050 kWh/kWp on a south-facing roof with no shading.
The installed cost column is a national figure, not a Portsmouth price. It is the DESNZ median of £1,780.25 per kW for systems up to 4 kW, derived from the MCS Installation Database and covering England, Scotland and Wales. No official dataset publishes installed costs at city level, and we will not imply one exists. Half of real installations cost more than the median.
| System Size | Panels | Cost | Annual Saving | Payback |
|---|---|---|---|---|
| 3 kW | ~8 panels | £5,340 | £482 | ~11 years |
| 4 kW | ~10 panels | £7,120 | £643 | ~11 years |
| 5 kW | ~13 panels | £8,480 | £804 | ~11 years |
Solar energy in Portsmouth: local context
The South East benefits from some of the highest solar irradiance in the UK. Homes across the region — from coastal towns to commuter belt suburbs — see above-average solar generation, making the financial case particularly strong.
Portsmouth homeowners benefit from 0% VAT on residential solar installations (until at least March 2027) and can earn income through the Smart Export Guarantee by selling surplus electricity back to the grid.
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Frequently asked questions about solar panels in Portsmouth
Solar panels in nearby areas
Showing areas near Portsmouth. Solar conditions vary by location.
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Connect with trusted local installers and get accurate pricing for your home.
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