Battery storage — Sussex
Fox ESS Batteries in Sussex
What Fox ESS means for a Sussex 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.
Fox ESS is one of the battery ranges people ask about most when they are comparing systems for a Sussex home, so this page puts its published figures next to the county’s own housing and network data. 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.
The range itself, from the 5.18 kWh EP5 to the stackable EQ4800 tower, is explained on our Fox ESS page. For the roof, see solar panels in Sussex; for how batteries work in general, the battery storage guide; and for each town’s own figures, battery storage in Horsham, home batteries in Crawley and Haywards Heath battery installation advice.
Quick answer
Fox ESS in Sussex:
- 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 Sussex
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 Sussex 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 Sussex homes
The three Sussex towns on this site sit on very different housing. Horsham district is house country: 37.2% of its 62,371 households live in detached homes and 26.9% in semis, so a garage or utility room is often available. Crawley, designated a New Town on 9 January 1947, is a terrace town: 37.4% of its households live in terraced houses and only 14.2% in detached ones. On a Crawley mid-terrace with no garage, the realistic spot is often a rear wall, and that is where the IP65 rating on Fox ESS’s EP5 and H1-G2 matters: both are published as suitable for outdoor installation. The EP5 is 380 × 625 × 147 mm and the inverter 434 × 418 × 185 mm, so a narrow rear wall needs measuring with the 300 mm clearance that Fox ESS’s warranty asks for around the battery.
All three town centres are in UK Power Networks’ South Eastern Power Networks area, with Horsham about 2.9 km from SSEN’s boundary. UK Power Networks says that a house whose supply can take the equipment needs only a notification within 28 days through its Smart Connect service, which approved installers use for G98 and G99 forms; above 16 A per phase (3.68 kW) a G99 approval comes first. Fox ESS publishes the H1-G2 from 3.0 to 6.0 kW and lists the 3.7 kW model at 3,680 VA for G98, so a Crawley terrace with a small array and a Horsham detached house with a large one can end up on different routes with the same brand.
Sussex: sunshine, the grid and local uptake
PVGIS puts a 4 kWp south-facing array at about 139 to 146 kWh in December across Horsham, Crawley and Haywards Heath, and about 493 to 526 kWh in June, Crawley at the low end and Haywards Heath at the top. That is about 4.5 to 4.7 kWh a day in December and 16.4 to 17.5 kWh a day in June (our arithmetic). DESNZ records 4,976 solar PV installations across Horsham district, 2,264 across Crawley and 5,845 across Mid Sussex at the end of 2025, about 13,085 in all (our sum), and DVLA records about 12,968 privately kept plug-in vehicles across the three councils at the end of June 2026, up from 9,570 a year earlier.
Ofgem’s 2024/25 figures for South Eastern Power Networks show about 42.2 supply interruptions per 100 customers and 30.4 minutes lost per customer over the year, down from 49.5 and 36.5 the year before, against 39.7 and 35.1 across Great Britain. A grid-tied Fox ESS system powers nominated circuits in a cut only if its EPS output was designed in, and then only up to the inverter’s 3 to 6 kW rating.
Local facts, sourced
Fox ESS and Sussex 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 Horsham at about 140 kWh in December and 503 kWh in June; in Haywards Heath about 146 kWh and 526 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 5,845 solar PV installations across Mid Sussex, 4,976 across Horsham district and 2,264 across Crawley at the end of 2025: about 13,085 in all (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 2,310 privately kept plug-in vehicles across Crawley at the end of June 2026, up from 1,619 a year earlier, and 5,228 across Horsham district, up from 3,924.
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 Horsham, Crawley and Haywards Heath all sit in UK Power Networks’ South Eastern Power Networks licence area; Horsham’s is about 2.9 km from SSEN’s Southern Electric Power Distribution boundary.
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 for South Eastern Power Networks: about 42.2 supply interruptions per 100 customers and 30.4 minutes lost per customer, down from 49.5 and 36.5 in 2023/24.
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 houses are Crawley’s largest housing type at 37.4% of the borough’s 45,500 households, with semis at 22.7%, flats and maisonettes at 25.1% and detached houses at 14.2%.
Source: ONS Census 2021, TS044 accommodation type (censusdata.uk)
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Of Horsham district’s 62,371 households, 37.2% live in detached homes, 26.9% in semis and 17.1% in terraces.
Source: ONS Census 2021, table TS044 (Accommodation type), via Nomis
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DESNZ estimates about 22.57% of homes in Horsham district have no mains gas connection, against about 8.67% in Crawley (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 Sussex
Town by town, with each town's own sunshine figures and network operator: battery storage in Horsham, battery storage in Crawley and battery storage in Haywards Heath.
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 Sussex. For a longer read, see Sussex home batteries: where each of five brands can go.
Comparing systems for a Sussex home? See EnSmart in Sussex, Tesla Powerwall in Sussex, Sigenergy in Sussex and EcoFlow PowerOcean in Sussex.
Fox ESS in Sussex: questions
Where would a Fox ESS battery go on a Crawley terrace?
Usually somewhere outside, because many Crawley terraces have no garage. Fox ESS publishes both the EP5 battery and the H1-G2 inverter as IP65-rated and suitable for outdoor installation, which makes a rear wall a real option. The catch is space: the EP5 is 380 mm wide and the inverter 434 mm, and the battery warranty asks for 300 mm of clearance around the pack. On a narrow rear wall that needs measuring before anything is ordered.
If I charge a Fox ESS battery overnight as well as from solar in Sussex, does the warranty last ten years?
Not necessarily. Fox ESS’s UK battery warranty runs ten years on EP-series batteries or to a throughput limit, whichever comes first: 38.85 MWh on the EP11. One full cycle a day is about 3.8 MWh a year on a 10.36 kWh EP11, so the limit lasts about ten years; two full cycles a day, solar by day and a cheap tariff overnight, reaches it in about five (our arithmetic). A Horsham roof making about 16.8 kWh a day in June does a lot of that cycling on its own.
Do I need permission from UK Power Networks for a Fox ESS battery in Sussex?
The installer deals with it, not you. All three Sussex town centres on this site are on UK Power Networks’ South Eastern network. Equipment up to 16 A per phase (3.68 kW) is notified within 28 days of commissioning; above that, a G99 application is approved before work starts. Fox ESS lists its 3.7 kW H1-G2 at 3,680 VA for G98, while its 5.0 and 6.0 kW models are over the line.