Solar Installers in Portsmouth

Portsmouth is one of the sunniest cities in mainland Britain and a strong residential solar market — particularly across Cosham, Drayton, Farlington and Southsea.

Solar panels in Portsmouth: a local intro

Portsmouth is one of the sunniest cities in mainland Britain and a strong residential solar market — particularly across Cosham, Drayton, Farlington and Southsea. Coastal-grade mounting is standard.

Why solar works well in Portsmouth

Portsmouth records 1,800+ sunshine hours and 1,080-1,100 kWh/kWp annually.

The benefits of solar panels

A modern residential solar system cuts your electricity bills from day one, insulates you against future energy-price rises, reduces carbon emissions, and (with the Smart Export Guarantee) pays you for any surplus power you send to the grid. With a 25-year panel performance warranty, you'll generate clean energy for two decades after the system has paid for itself. See our are solar panels worth it guide for the latest UK payback numbers.

Solar battery storage

Adding battery storage to a Portsmouth solar install typically lifts self-consumption from around 35% to 75-85%, dramatically cutting the amount of expensive grid electricity you import in the evening. Combined with a smart tariff like Octopus Flux, a properly sized battery can save a further £400-£900 per year — typically paying back in 7-10 years.

EV charger installation

More Portsmouth households now charge an electric vehicle from home than ever before. A solar-aware EV charger (Zappi, Hypervolt, Ohme) lets you fuel many of your summer miles from excess solar generation — effectively at 0 p/kWh.

Typical property types in Portsmouth

Victorian terraces dominate Southsea, Eastney and central Portsmouth; 1930s semis and bungalows in Cosham and Drayton.

Roof guidance for Portsmouth homes

The right panel layout for your Portsmouth (PO1) home depends on roof pitch, orientation and condition. Most South East roofs sit between 30° and 45°, which is close to ideal — within a few percent of optimum yield. East-west splits are not a problem either: they flatten your generation curve across the day, which actually pairs nicely with battery storage and EV charging. We'll check rafter spacing and tile condition before quoting; if your roof needs replacement within the next 5 years it usually makes sense to do that first, otherwise the system can be lifted and reset for a nominal fee. For slate, we use non-penetrating slate hooks rather than drilling through; for concrete or clay tile, we use micro-rail systems that distribute load across multiple rafters.

Solar costs in Portsmouth

Standard 4 kWp installs from £6,500; bungalow installs often go larger for excellent value.

Funding your install in Portsmouth

Residential solar, battery storage and solar-aware EV chargers in Portsmouth all qualify for 0% VAT under HMRC's Energy Saving Materials relief — that's an immediate ~20% saving baked into your quote, with no paperwork from you. Most of our installers also offer interest-bearing finance from 3-10 years via Phoenix Financial Services or Propensio, with monthly repayments designed to be lower than the bill saving from day one. Low-income households across Hampshire may qualify for ECO4 grants towards solar where the home has an EPC rating of D or below; we can route eligible enquiries to an ECO4-registered partner.

Expected savings in Portsmouth

Annual savings of £1,000-£1,700 typical; up to £2,000+ on larger bungalow installs.

Seasonal generation in Portsmouth

A typical 4 kWp system in Portsmouth (PO1) generates roughly 60% of its annual output between April and September, with June and July alone often accounting for 25-28%. Mid-winter (December, January) yields are around a tenth of midsummer — usually 70-120 kWh per month from a 4 kWp array — which is why battery storage and a time-of-use import tariff matter so much for winter savings. Spring and early autumn tend to be the most pleasant months for self-consumption: long days, mild temperatures (panels actually generate slightly more efficiently at cooler temperatures), and household demand still high enough to use most of what you produce.

Smart tariffs and SEG export in Portsmouth

Once your Portsmouth system is commissioned and your DNO has approved the G98 or G99 notification, you can apply for the Smart Export Guarantee with any licensed supplier — you do not have to stay with your current import supplier to export. The most popular choices in 2026 are Octopus Outgoing Fixed (15p/kWh flat), Octopus Flux (variable, designed for solar + battery households, peak export around 26p/kWh), and E.ON Next Export Exclusive (16.5p/kWh). If you don't have a battery, a flat-rate export tariff usually wins; if you do, a time-of-use tariff like Flux or Intelligent Octopus Flux typically delivers the highest annual revenue. Your installer will model both at quote stage.

What the install process looks like in Portsmouth

Once you accept a quote, your Portsmouth installer files a Section 80 notification with the local council (a free notification, not a planning application), books your DNO notification (G98) or pre-approval (G99), and arranges scaffolding. Scaffolding usually goes up the day before fitting and stays for 5-7 working days. On install day itself, a 2-3 person team typically completes a 4-6 kWp roof in a single day. Battery and inverter commissioning, electrical certification (NICEIC or NAPIT) and handover happen on day two. You'll receive your MCS certificate, building-control notification (via the Competent Person scheme), electrical installation certificate and product warranty pack within 5 working days of commissioning.

Aftercare and warranties on Portsmouth installs

Every system installed via our Portsmouth network is covered by a 25-year panel performance warranty (typically guaranteeing at least 84-87% output at year 25), a 10-12 year inverter warranty, a 10-year battery warranty (often with 70% capacity guaranteed at year 10), and a 12-year workmanship warranty backed by the IWA insurance product through RECC. If your matched installer ever ceased trading — extremely rare amongst our vetted network — the insurance backing means another firm would honour the workmanship cover. Annual remote monitoring and maintenance is included as standard; most issues are spotted before you'd notice them, and any on-roof repairs are covered for the duration of the workmanship warranty.

Why choose South East Solar Network

We match Portsmouth homeowners with vetted, MCS-accredited installers who have a track record in your postcode. We carry no sales targets, no commission pressure — just a free quote and an honest opinion. Every install is RECC-protected and carries a 12-year workmanship warranty. Read more about how we vet installers, or jump straight to a free roof survey.

Local touch: Portsmouth

Portsmouth City Council is supportive; coastal-grade A4 mounting standard.

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Before you buy

Solar guides for Portsmouth homeowners