Solar battery storage in East Sussex: what it costs, how to size it and where it can go

By David Coleman. Last checked: 4 November 2026. Figures are dated and sourced; estimates are labelled.

A battery does not make your roof produce more electricity. It stores what the panels make at midday, or what you buy when it is cheap, for use in the evening. In East Sussex the case depends less on the county than on three things: how much of your power you use after dark, whether you control the roof and wall space, and what your import and export tariffs are.

The quick answer on price: the Energy Saving Trust puts a 5 kWh battery system at around £4,600, within a range of £1,500 to £10,000, and gives a typical lifespan of 10 to 12 years (checked 4 November 2026). There is no published East Sussex battery price, so treat those as national guide figures.

Who in East Sussex a battery suits

Housing in the county splits sharply. Census 2021 puts 43.7% of Wealden households and 42.1% of Rother households in detached homes, against 16.7% in Eastbourne and 10.3% in Brighton and Hove, where 50.0% live in flats or conversions (ONS TS044). A house with a garage, utility room or a clear outside wall has somewhere for the battery. A flat often does not, and the freeholder usually has to agree to anything fixed to the building.

Batteries make most sense where:

• you already have solar, or plan to, and use a lot of power in the evening;
• you are on, or would switch to, a time-of-use tariff with a cheap overnight rate;
• you run a heat pump (the Energy Saving Trust says a battery running a heat pump saves more than one only storing solar).

They make less sense with very low use, no suitable space, or a tariff that pays little difference between day and night.

Sizing a battery against East Sussex sunshine

PVGIS models a south-facing roof near Hailsham at about 1,134 kWh per kWp a year (35° pitch, 14% losses, SARAH3 data, run 4 November 2026; PVGIS 5.3). For a 4 kWp roof that is about 4,536 kWh a year, PVGIS estimate. But winter is thin: about January 172 kWh December 156 kWh for the same roof, against 560 kWh in June. In summer a 5 kWh battery will often fill; in December it may barely charge from the roof alone, which is why many households pair it with off-peak charging.

The Energy Saving Trust says a typical home system might be 10 kWh and that the system usually stops discharging at around 20% to protect the battery. Size it on your smart meter’s evening use, not on the nameplate.

What a stored unit is worth

A simple way to see the value: each unit stored and used at home instead of exported swaps an export payment of around 12p (the Energy Saving Trust SEG figure) for an import you no longer pay at up to 26.32p/kWh (the Ofgem price cap Direct Debit rate, 1 October to 31 December 2026). That is about 14.32p a unit, or roughly £0.72 for one full 5 kWh cycle. This is illustrative arithmetic, not a savings estimate: round-trip losses, cloudy days and your actual tariff all change it.

Where a battery can go: flats, conservation areas and listed homes

Most batteries go in a garage, utility room or on an outside wall. Indoors, a battery on a house is normally not a planning matter. Outside, it can be:

• Brighton and Hove has 34 conservation areas on the national Planning Data register, and the council’s solar guide shows how tightly roof equipment is controlled there. Ask the council before fixing an enclosure to the front of a building in a conservation area.
• Eastbourne has 12 conservation areas, including Meads and Town Centre and Seafront, and two Article 4 directions (Lewes and Eastbourne Councils).
• Listed buildings anywhere need listed building consent for most external fixings.

Town guides: solar panels in Eastbourne, solar panels in Brighton and Hove and the East Sussex solar overview.

Retrofit, new solar, and the network operator

Fitting a battery with new panels is usually simpler and cheaper, because the installer is already on site (the Energy Saving Trust makes the same point). A retrofit means either adding a battery beside your existing inverter or replacing it with a hybrid one. Either way, the extra equipment may change how the system is connected: smaller systems are notified after fitting under G98, larger ones need G99 approval from the network operator first. Ask each quote which route it assumes.

VAT on batteries

Installing a battery in a home is zero-rated under the energy-saving materials relief, including a battery fitted on its own since 1 February 2024, until 31 March 2027 (HMRC Notice 708/6). From 1 April 2027 the rate is due to go back to 5%.

What to ask for in a quote

• Usable capacity (not just nameplate) and the warranty terms.
• Whether it is AC-coupled or a hybrid inverter, and what happens to your existing inverter.
• Where it will be sited and why.
• The network route (G98 or G99) and any export limit.
• Whether backup in a power cut is included; most grid-tied batteries switch off with the grid unless backup is designed in.

For more on prices, read how much a home battery costs in the UK. Over the border, the Kent home battery guide covers the same questions for Kent homes.

Sources

• Energy Saving Trust, Battery storage: checked 4 November 2026.
• Energy Saving Trust, Solar panels: checked 4 November 2026 (EST figures use fuel prices as of July 2026).
• PVGIS 5.3 PVcalc (European Commission JRC), SARAH3 data: model run 4 November 2026.
• ONS Census 2021, TS044 Accommodation type (Nomis): Census day 21 March 2021; percentages are ours; checked 4 November 2026.
• Ofgem, Changes to energy price cap between 1 October and 31 December 2026: applies 1 October to 31 December 2026.
• HMRC, VAT on energy-saving materials and heating equipment (Notice 708/6): zero rate 1 May 2023 to 31 March 2027; checked 4 November 2026.
• Planning Data (MHCLG), Conservation area dataset: records counted by council on 4 November 2026: Eastbourne 12, Brighton and Hove 34, Wealden 33, Lewes 28, Hastings 18, Rother 10.
• Brighton & Hove City Council, Installing solar panels on your home: checked 4 November 2026.
• Lewes and Eastbourne Councils, Article 4 directions: lists two Eastbourne directions (Park Close; Devonshire Meads); checked 4 November 2026.