Battery storage — South West London
Fox ESS Battery Storage in South West London
What Fox ESS 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 is terraces, flats and interwar semis, so the first Fox ESS question here is usually where a battery would physically go. This page answers that from Fox ESS’s published figures and the boroughs’ own data; the range is on our Fox ESS page, the roofs on solar panels in South West London, and the basics in our battery storage guide.
The battery system in HCE’s own job photos is EnSmart; if Fox ESS 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. Borough detail is on battery storage in Wimbledon, home batteries in Sutton and Kingston upon Thames battery installation advice.
Quick answer
Fox ESS in South West London:
- Our own work: the battery systems in HCE's own job photos are EnSmart; if Fox ESS 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 Fox ESS fits South West London homes
The housing is the constraint. In Merton 35.7% of households live in terraced homes and 28.4% in purpose-built flats, with detached houses at just 5.7%; in Kingston flats total 36.3%, and in Sutton purpose-built flats are 31.3%. On a Victorian terrace with no garage and no side access, the realistic places are an understairs cupboard, a rear wall or a rear extension. Fox ESS publishes the EP5 battery at 380 × 625 × 147 mm and about 50.5 kg, wall- or floor-mounted, and the H1-G2 inverter at 434 × 418 × 185 mm and 22 kg, both IP65 for indoor or outdoor use. The warranty asks for 300 mm of clearance and adequate ventilation around the battery, which a tight understairs space may not give. In a flat, the freeholder decides first.
South-west London sits across two UK Power Networks licence areas. The centres of Wimbledon, Mitcham and Tooting are on London Power Networks; those of Kingston, Surbiton, Twickenham, Richmond, Sutton, Carshalton and Croydon are on South Eastern Power Networks, and Kingston, Richmond and Twickenham are within about 1.2 km of a boundary, so the postcode decides. Either way UK Power Networks takes G98 and G99 forms through its Smart Connect service, used by approved installers, and says that installations exporting under 5 kW after any export limitation are approved automatically. A small terrace array with Fox ESS’s 3.7 kW H1-G2, which it lists at 3,680 VA for G98, is the simplest route.
South West London: sunshine, the grid and local uptake
PVGIS puts a 4 kWp south-facing array at about 137 to 140 kWh in December across the ten south-west London towns on this site, and about 479 to 484 kWh in June, Surbiton at the top. That is about 4.4 to 4.5 kWh a day in December and 16.0 to 16.1 kWh in June (our arithmetic). Terrace roofs often carry less than 4 kWp, so the figures scale down with the array.
DESNZ records about 16,866 solar PV installations across Kingston, Merton, Richmond, Sutton, Croydon and Wandsworth at the end of 2025 (our sum), 5,161 of them in Croydon. DVLA records about 38,041 privately kept plug-in vehicles across the six boroughs at the end of June 2026, up from 31,196 a year earlier. Ofgem’s 2024/25 figures show about 11.2 supply interruptions per 100 customers and 10.5 minutes lost per customer on London Power Networks, and about 42.2 and 30.4 on South Eastern Power Networks, against 39.7 and 35.1 across Great Britain. Fox ESS’s EPS output powers nominated circuits in a cut only where it is designed in.
Local facts, sourced
Fox ESS and South West London in numbers
Every figure below comes from a named public or manufacturer source.
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PVGIS puts a 4 kWp south-facing array in Wimbledon at about 140 kWh in December and 480 kWh in June; in Kingston upon Thames about 138 kWh and 481 kWh.
Source: PVGIS 5.3, European Commission Joint Research Centre (PVGIS-SARAH3 2005–2023), 4 kWp, 35°, due south, 14% losses, building-mounted, run 15 October 2026; daily figures are our arithmetic
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DESNZ records 5,161 solar PV installations across Croydon at the end of 2025; across the six south-west London boroughs on these pages, about 16,866 (our sum).
Source: DESNZ, Renewable electricity by local authority 2014 to 2025, Solar PV sites (published 29 September 2026, end-of-2025 figures as first published); totals are our sums
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DVLA records 9,010 privately kept plug-in vehicles across Croydon at the end of June 2026, up from 7,049 a year earlier, and 6,646 across 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); totals are our sums
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The centres of Wimbledon, Mitcham and Tooting sit in UK Power Networks’ London Power Networks area; those of Sutton, Croydon and Carshalton in its South Eastern Power Networks area.
Source: UK Power Networks licence boundaries (December 2024) and NESO GB DNO licence areas (May 2024)
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Ofgem’s 2024/25 figures: 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, sheet Ch2 outputs - reliability (published 15 January 2026)
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Terraced homes make up 35.7% of Merton’s housing (29,176 households), with purpose-built flats at 28.4%, semis at 19.0% and detached homes at 5.7%.
Source: ONS Census 2021, table TS044 (Merton)
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In Kingston upon Thames semis are the largest single type at 31.7% of 65,626 households, while flats total 36.3% (29.8% purpose-built, 6.5% converted).
Source: ONS Census 2021, TS044 accommodation type (Kingston borough)
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DESNZ estimates about 22.38% of homes in Wandsworth have no mains gas connection, against about 8.39% in Richmond upon Thames (2024).
Source: DESNZ, Subnational estimates of properties not connected to the gas network, 2024 (published 18 December 2025)
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 Fox ESS 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 EcoFlow PowerOcean in South West London.
Fox ESS in South West London: questions
My south-west London terrace has no garage. Where would a Fox ESS battery go?
Usually a rear wall, a rear extension or an indoor cupboard with enough space. Fox ESS publishes the EP5 and the H1-G2 inverter as IP65 for indoor or outdoor use, so outside is an option. The EP5 is 625 mm tall and 380 mm wide, and Fox ESS’s warranty can be voided by less than 300 mm of clearance or poor ventilation, which often rules out a tight understairs space. The cable route to the consumer unit settles the rest.
Is a Fox ESS battery worth it on a small terrace roof in Wimbledon or Tooting?
Sometimes. In Wimbledon PVGIS puts a 4 kWp south-facing array at about 4.5 kWh a day in December and about 16 kWh a day in June; a terrace roof may carry less. One 5.18 kWh EP5 can take a good share of a smaller array’s summer surplus, and it can be extended later. If a battery would not pay its way on your roof and usage, we will say so.
Does it matter whether I am on London Power Networks or South Eastern Power Networks?
Not to the Fox ESS kit: both are UK Power Networks licence areas, the G98 and G99 rules are the same, and the forms go through UK Power Networks’ Smart Connect service. It matters for the figures: Ofgem’s 2024/25 data show about 11.2 interruptions per 100 customers on London Power Networks and about 42.2 on South Eastern. Towns such as Kingston and Richmond sit close to a boundary, so check your postcode.