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Home Battery Storage and Solar Battery Retrofit in South Wales

Battery storage designed and installed by NICEIC electricians - retrofitted to an existing solar array, added with a new system, or fitted on its own to run your house on off-peak electricity.

A home battery does one simple thing: it moves electricity from when it is cheap or free to when it is expensive. That can mean storing your own solar generation instead of exporting it, or charging from the grid overnight on an off-peak EV tariff and running the house from the battery through the expensive evening peak. We install both, and we will tell you honestly which one your house actually justifies.

Three ways a battery is used here

  • Retrofit to existing solar - you already have panels, you export most of what you generate during the day, and you buy it back at four to five times the export rate in the evening. A retrofit battery closes that gap. This is the most common enquiry we get.
  • Added with a new solar system - specified together, sized against your actual consumption pattern rather than a standard package.
  • Battery only, no solar - on a time-of-use tariff you charge overnight at the off-peak rate and discharge through the peak. No roof work involved, which suits shaded properties, conservation areas and flats.

What it costs

A 5 kWh battery is typically £3,500 to £4,500 installed, priced on survey. Larger capacities scale from there. The right size is set by how much electricity you actually use between sunset and sunrise - oversizing a battery is the most common and most expensive mistake in domestic storage.

Is it worth it? An honest answer

For a household that is out all day and uses most of its electricity in the evening, a battery added to solar typically pays back over 8 to 12 years on current prices - longer than the panels themselves, which is why we never sell one as a default add-on. The case improves sharply if you are on a time-of-use tariff with a wide day/night spread, if you have an EV charging at home, or if you are exporting a lot of unused generation. It is weaker if you are already self-consuming most of what you generate.

We would rather size that honestly at survey than sell you capacity you will not cycle.

What is included

  • Battery, inverter or hybrid inverter, and all protective devices
  • Integration with an existing solar array, including inverter compatibility checks
  • Dedicated circuit, isolation and labelling to BS 7671
  • Commissioning, monitoring app setup and off-peak schedule configuration
  • G98/G99 network notification where required, and MCS certification where applicable

Standards we work to

  • BS 7671 18th Edition Amendment 2
  • IET Code of Practice for Electrical Energy Storage Systems
  • MCS certification where the installation qualifies
  • Part P Building Regulations

Pairing with solar and EV charging

Because we install solar, batteries and EV chargers under one NICEIC Approved Contractor registration, the three get specified as one system rather than three purchases. Surplus generation charges the battery, the battery covers the evening peak, and a solar-divert charger takes what is left for the car. See domestic solar panel installation and home EV charger installation.

Book a free battery storage survey

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.

Standards we work to

  • BS 7671
  • IET Code of Practice for EESS
  • MCS
  • Part P

Equipment and components

  • 5 kWh to 15 kWh domestic battery systems
  • Hybrid and AC-coupled inverters
  • SolarEdge (where paired with FLD solar)
Coverage

Home Battery Storage and Solar Battery Retrofit available in

Swansea Neath Port Talbot Morriston Gorseinon Llanelli All 30 locations
From the blog

Further reading

FAQ

Frequently asked questions

It depends on your consumption pattern. If you are out during the day and consume most electricity in the evening and overnight, a battery pays back the additional cost in 8 to 12 years alongside a 25-year solar asset -- worthwhile but not the priority. If you have an EV to charge or high evening demand, the payback shortens significantly. With a time-of-use tariff like Octopus Agile, a battery can also perform overnight cheap-rate charging arbitrage independent of solar. FLD models both scenarios and does not default to recommending a battery when it does not improve the economics.
Yes - we design and install battery storage alongside solar, so you can store and use more of the energy you generate.
If your self-consumption rate sits below about 60%, or your site has significant evening or night load, a battery shortens payback and lifts return. For most daytime-operating warehouses and factories already at 70%-plus self-consumption, batteries are optional and we sometimes advise against them to keep payback tight. We model both cases in the proposal.
Correct as of August 2026. Flat-rate SEG sits at roughly 10 to 16.5p/kWh: E.ON Next pays around 16.5p where you bundle import and export, British Gas Export and Earn Plus around 15.1p with Good Energy at a similar level, while Octopus Outgoing Fixed and OVO both sit at about 12p — Octopus is competitive but is not the top flat rate, which is a common misconception. Standalone/open tariffs run lower, from about 3p. The headline 25p-plus figures you see quoted are time-of-use peak rates (Octopus Flux and Intelligent Flux have historically peaked near 29 to 32p) and only apply for a few hours a day, so they are not comparable with a flat rate. Rates move on roughly 30 days notice, so we compare live rates with you at commissioning rather than fixing a number in a quote.
Based in Swansea, we cover South Wales - Cardiff, Newport, Bridgend, Carmarthenshire and Pembrokeshire - and take on larger commercial projects further afield.
Yes - NICEIC Approved, MCS Certified, SSIP accredited and ConstructionLine accredited, with 35 years' experience (established 1991).
Yes - free, no-obligation site assessments and fixed-price quotations with no hidden costs.

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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