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Domestic Solar PV Installation in Swansea and South Wales

MCS certified domestic solar with SolarEdge optimiser inverters and tier-1 Trina or JA Solar panels, sized 3 to 8 kWp, with optional battery and EV charger integration.

Residential solar in South Wales

A typical 4 kWp rooftop system in Swansea generates around 3,800 kWh per year based on the 950 kWh/kWp yield for SA postcodes. At 30p/kWh grid import and a blended self-consumption of 40%, the in-bill saving sits at roughly £460 per year, with an additional £230 from Smart Export Guarantee payments at 15p for the 2,280 kWh exported.

Worked example: 4 kWp with 5 kWh battery

  • Installed cost: £7,500 to £9,500 (panels and inverter)
  • Battery addition: £3,500 to £4,500
  • Combined first-year benefit with time-of-use tariff: £900 to £1,150
  • Simple payback: 9 to 11 years without battery, 8 to 10 years with battery on an Octopus Agile or Intelligent Flux tariff

What is included

  • Structural roof survey and pre-install inspection
  • Scaffolding and all safety works
  • SolarEdge string inverter with panel-level optimisers
  • Trina Vertex or JA Solar DeepBlue panels
  • DC and AC isolation, surge protection, earthing upgrades if needed
  • G98 DNO notification and MCS certification
  • SEG application support for your chosen supplier
  • Monitoring app setup and full handover pack

Standards

  • BS 7671 18th Edition Amendment 2
  • MCS 3002:2025 product and installation requirements
  • IET Code of Practice for Electrical Energy Storage Systems
  • Part P Building Regulations

Smart Export Guarantee

SEG rates in 2025-26 sit at around 3 to 7p/kWh on open tariffs and 15 to 25p/kWh on tied tariffs where you use the supplier for both import and export. Octopus Outgoing, British Gas Export and Earn Plus and E.ON Next Export Exclusive currently lead on tied rates. We help you compare live rates at commissioning.

Our process

  1. 1
    Site survey

    A named FLD engineer visits your site, measures the roof or installation zone, inspects the incoming supply and verifies load, structural integrity and orientation. For commercial sites we run a full discovery including half-hourly consumption data where available.

  2. 2
    Design and proposal

    We produce a scaled layout, generation model using PVGIS data, financial model with simple and post-tax payback, DNO G99 or G98 notification pack where relevant, and a fixed-price quotation. Every proposal names the exact panels, inverters and mounting system.

  3. 3
    DNO and planning

    We handle NGED G99 Type A applications for commercial systems, G98 notifications for domestic, and any permitted development confirmation or full planning submissions required for listed buildings or conservation areas.

  4. 4
    Install and commission

    FLD directly-employed engineers install under a single NICEIC Approved Contractor sign-off. Commissioning includes BS 7671 testing, SolarEdge monitoring portal setup, MCS certification where applicable, and handover of all documentation.

  5. 5
    Aftercare

    Insurance-backed NICEIC warranty, 25-to-30-year panel performance warranty from the tier-1 manufacturer, 12-year SolarEdge inverter warranty, and ongoing O and M support including remote performance monitoring.

Completed commercial rooftop solar array installed by FLD Solar & Electrical

180 kWp commercial rooftop array, South Wales — FLD installation

Solis 5G Series commercial solar inverters in plant room
Solar panel installation in progress on industrial facility roof

Recent FLD installation — view all project photos

Standards we work to

  • BS 7671
  • MCS 3002:2025
  • Part P
  • G98
  • IET CoP for EES

Equipment and components

  • SolarEdge
  • Trina Vertex
  • JA Solar
Coverage

Domestic Solar PV Installation in Swansea and South Wales available in

Swansea Sketty Mumbles Morriston Gorseinon Penarth Barmouth Harlech All 30 locations
From the blog

Further reading

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Solar in Dolgellau and Eryri: dark-stone townscape, in-roof integrated panels and National Park planning

A planning and design guide for solar installation in Dolgellau and the Eryri National Park. Why dark-frame black-panel in-roof integrated systems are the standard specification for LL40, when ENPA pre-application is needed, and payback for Mawddach valley guesthouses.

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FAQ

Frequently asked questions

A typical 4 kWp rooftop system with a tier-1 panel and SolarEdge inverter costs roughly £7,500 to £9,500 installed, before battery. A 5 kWh battery adds roughly £3,500 to £4,500. At South Wales yields of 950 kWh/kWp, annual generation is c. 3,800 kWh, and self-consumption of 40% at 30p/kWh plus 60% export at 15p/kWh gives first-year benefit of c. £800. Simple payback around 9 to 10 years, shorter with a battery and TOU tariff.
Yes, for domestic systems. MCS certification of the installation is required to claim SEG payments with any UK supplier. We are MCS-certified and handle the paperwork as part of the install.
SEG rates in 2025-26 range from about 3 to 7p/kWh on open tariffs up to 15 to 25p/kWh on tied tariffs where you use the supplier for both import and export. Octopus Outgoing, British Gas Export and Earn Plus, and E.ON Next Export Exclusive currently sit at the higher end. Rates change monthly. We help clients compare live rates at commissioning.
Yes, with design compliance. The Gower Area of Outstanding Natural Beauty (Britain's first AONB, designated 1956) imposes visual-impact constraints. In-roof integrated solar is the routine compliant option, sitting flush with the roof rather than proud of it. For listed buildings and properties within Oystermouth or Penmaen conservation areas, additional consent may be required and we handle that process as part of scope.
We specify SolarEdge inverters with Trina Vertex or JA Solar DeepBlue panels as our standard stack. SolarEdge string optimisers give panel-level monitoring and isolate shading losses. Trina and JA are both tier-1 bankable manufacturers with 25 to 30-year performance warranties. For specific projects we can specify alternative tier-1 brands if building, warranty or finance requirements dictate.
Tier-1 panels carry 25 to 30-year performance warranties, guaranteeing a specified output (typically 85 to 87% of year-one performance) at year 25 or 30. Real-world lifespan commonly exceeds 35 years with a gradual, well-characterised degradation curve of around 0.4 to 0.55% per year. Inverters are typically replaced once at around year 12 to 15.

Ready for a fixed-price quotation?

Speak to Paul directly. Most quotes turn around within five working days of a site survey.

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