Battery storage — South West London
EcoFlow PowerOcean in South West London
What EcoFlow PowerOcean means for a South West London home, how it compares with the systems we fit, and a written answer on supply, installation and warranty if it is the one you want.
South-west London’s homes are mostly terraces and flats, and that shapes where an EcoFlow PowerOcean can go: terraced homes are 35.7% of Merton’s housing, and flats total 36.3% of Kingston upon Thames households (Census 2021). The area page is solar panels in south-west London; the town pages include battery storage in Kingston upon Thames, Wimbledon and Croydon; and the general guide is battery storage.
As for the brand, the battery system in HCE’s own job photos is EnSmart; if an EcoFlow PowerOcean is what you want, ask us and we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches. In a flat or a rented terrace, the freeholder’s or landlord’s consent comes before that.
Quick answer
EcoFlow PowerOcean in South West London:
- Our own work: the battery systems in HCE's own job photos are EnSmart; if EcoFlow PowerOcean is what you want, ask us and we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches.
- Cost: the Energy Saving Trust puts home battery storage at £1,500 to £10,000, with a 5 kWh system at around £4,600; a quote for your home comes from a survey of your usage.
- VAT: residential battery installations carry 0% VAT until 31 March 2027, then 5% from 1 April 2027.
- Grid: every battery is notified to, or approved by, the local network operator depending on its size (G98 or G99); the installer handles it.
- Power cuts: a standard grid-tied battery shuts down when the grid does; backup has to be designed in and is never assumed.
- Who fits it: HCE is a NAPIT member (73495), MCS-certified for solar PV and battery storage via NAPIT, and a HIES Consumer Code member.
Figures: Energy Saving Trust (batteries, updated 19 August 2026) · HMRC VAT Notice 708/6. Product facts are the manufacturer's, cited below.
How a home battery gets fitted in South West London
Four steps from first call to switch-on. No pressure at any stage, and a straight answer if it would not pay its way.
- Step 1
Your usage, not a guess
We look at when your South West London home uses power, especially evenings, and your tariff, because that, not the sunniest month, decides the battery size.
- Step 2
Sizing and siting
Where the unit can go (garage, utility room or an outside wall, as the manufacturer allows), whether it pairs with existing panels, and a written, itemised quote.
- Step 3
Installation and notification
Fitting and commissioning, with the battery notified to or approved by your network operator depending on its size. Backup in a power cut only if it is designed in.
- Step 4
Settings and handover
Charge and discharge set up around your tariff, the app explained, and the warranty documents in your hand.
How EcoFlow PowerOcean fits South West London homes
A terrace without a garage is where the PowerOcean’s IP65 enclosure, heating pads and wall-mount option earn their place: a rear or side wall near the meter can work, subject to the siting rules checked at survey. Flats are harder. Flats make up 41% of Croydon’s dwellings, and across the Tooting Bec, Tooting Broadway and Furzedown wards 54.2% of households live in one, and UK Power Networks says the building owner’s permission is needed before storage work on a multi-occupied building.
The area straddles two UK Power Networks licences. The Wimbledon, Mitcham and Tooting town centres are on London Power Networks; Kingston, Surbiton, Twickenham, Richmond, Sutton, Carshalton and Croydon are on South Eastern Power Networks, several of them within 2 km of a boundary, so a postcode check settles each address. Either way the installer notifies under G98 up to 16 A per phase (3.68 kW) or gets G99 approval first above it, and UKPN approves automatically where the maximum export after export limitation is under 5 kW.
South West London: sunshine, the grid and local uptake
PVGIS gives a 4 kWp south-facing array about 137 kWh in December at Surbiton and Croydon to 140 kWh at Wimbledon, and about 479 kWh in June at Mitcham, Tooting and Richmond to 484 kWh at Surbiton. DESNZ records about 5,161 solar PV installations across Croydon and 2,690 across Sutton (end of 2025), and DVLA counts about 9,010 privately kept plug-in vehicles in Croydon, up from 7,049 a year earlier, and 6,646 in Wandsworth, up from 5,772.
Ofgem’s 2024/25 figures show about 11.2 supply interruptions per 100 customers and about 10.5 minutes lost per customer on London Power Networks, and about 42.2 interruptions and 30.4 minutes on South Eastern Power Networks. Those are averages for each whole licence area.
Local facts, sourced
EcoFlow PowerOcean and South West London in numbers
Every figure below comes from a named public or manufacturer source.
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PVGIS: December about 137 kWh at Surbiton and Croydon to 140 kWh at Wimbledon for a 4 kWp south-facing array; June about 479 kWh (Mitcham, Tooting, Richmond) to 484 kWh (Surbiton).
Source: PVGIS 5.3, European Commission Joint Research Centre (PVGIS-SARAH3, 2005-2023), 4 kWp, 35°, due south, 14% losses, building-mounted, town-centre runs made 15 October 2026
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Terraced homes are 35.7% of Merton’s housing and purpose-built flats 28.4%.
Source: ONS Census 2021, table TS044 (Merton)
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Flats make up 41% of Croydon’s dwellings (about 66,900), with semis at 24%, terraces at 23% and detached houses at 12%.
Source: Croydon Local Housing Needs Assessment (Iceni Projects for LB Croydon, December 2023, para 3.27, Census 2021 data)
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Of 20,452 households in the Tooting Bec, Tooting Broadway and Furzedown wards, 54.2% live in a flat: 31.1% purpose-built and 20.4% in converted or shared houses.
Source: ONS Census 2021, TS044 Accommodation type, 2022 wards E05014023, E05014024 and E05014013, via the Nomis API
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DESNZ records about 5,161 solar PV installations across Croydon, 2,690 across Sutton, 2,608 across Richmond upon Thames and 2,398 across Merton at the end of 2025.
Source: DESNZ, Renewable electricity by local authority 2014 to 2025, Solar PV sites and capacity (published 29 September 2026; end-of-2025 figures as first published)
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DVLA records about 9,010 privately kept plug-in vehicles in Croydon (up from 7,049) and 6,646 in Wandsworth (up from 5,772).
Source: DfT and DVLA, VEH0142 licensed plug-in vehicles by local authority, private keepers, 2026 Q2 against 2025 Q2 (published 23 September 2026)
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The Wimbledon, Mitcham and Tooting town centres are on London Power Networks; Kingston, Sutton and Croydon town centres are on South Eastern Power Networks.
Source: UK Power Networks licence boundaries (December 2024) and NESO GB DNO licence areas (May 2024)
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Ofgem 2024/25: London Power Networks about 11.2 interruptions per 100 customers and 10.5 minutes lost per customer; South Eastern Power Networks about 42.2 and 30.4.
Source: Ofgem, RIIO-2 Electricity Distribution annual report 2024 to 2025, supplementary datafile, reliability sheet (CI and CML, planned and unplanned; published 15 January 2026)
Data last reviewed: October 2026
Battery storage across South West London
Town by town, with each town's own sunshine figures and network operator: battery storage in Kingston upon Thames, battery storage in Wimbledon, battery storage in Surbiton, battery storage in Twickenham, battery storage in Sutton, battery storage in Richmond, battery storage in Croydon, battery storage in Mitcham, battery storage in Carshalton and battery storage in Tooting.
The full specification is on our EcoFlow PowerOcean page. For how sizing, warranties and pairing with panels work, see our main battery storage guide, and for the wider area, solar panels across South West London. For a longer read, see Smaller homes in South West London: five batteries compared.
Comparing systems for a South West London home? See EnSmart in South West London, Tesla Powerwall in South West London, Sigenergy in South West London and Fox ESS in South West London.
EcoFlow PowerOcean in South West London: questions
Can a PowerOcean go on the outside wall of a south-west London terrace?
Often it can be considered. EcoFlow rates the enclosure IP65, offers wall mounting and builds in heating pads for cold weather. Whether your wall works depends on its construction, the route to the consumer unit, access and the siting rules the surveyor checks.
I own a leasehold flat in Croydon. Is a PowerOcean possible?
Only with the freeholder’s permission. UK Power Networks says the building owner’s permission is needed before solar or storage work starts on a multi-occupied building. If permission is given, the survey looks at where a floor- or wall-mounted stack could safely go.
Does HCE fit PowerOcean batteries in south-west London?
The battery system in HCE’s own job photos is EnSmart. If you want a PowerOcean, ask us and we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches.
Which UK Power Networks licence covers my PowerOcean in Wimbledon or Kingston?
Wimbledon’s town centre is on London Power Networks and Kingston’s on South Eastern Power Networks, but both are close to a boundary, so the postcode decides. Both licences belong to UK Power Networks and the installer submits the notification or application.