Battery storage — Sussex
Sigenergy SigenStor in Sussex
What Sigenergy 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.
In the part of Sussex our battery pages cover, the question about a Sigenergy SigenStor is mostly about summer: Horsham's town-centre PVGIS run gives about 503 kWh in June for a 4 kWp array, one of the higher June figures in our data, and a battery is how that midday surplus reaches the evening. The three towns behave differently, though. Horsham is a district of detached houses, Crawley is a New Town of terraces, and Haywards Heath has more purpose-built flats than either. The county context is on our solar panels Sussex page.
The battery system in HCE's own job photos is EnSmart; if a Sigenergy SigenStor 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. Every Sigenergy figure on this page comes from Sigenergy's own datasheets and Europe warranty, and our battery storage guide covers how any home battery should be sized.
Quick answer
Sigenergy in Sussex:
- Our own work: the battery systems in HCE's own job photos are EnSmart; if Sigenergy 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 Sigenergy fits Sussex homes
Siting changes from town to town. In Horsham district 37.2% of households live in detached homes and 26.9% in semis, so a garage floor usually takes a SigenStor stack, with each module 767 mm wide and 265 mm deep. In Crawley, where terraces are the largest housing type at 37.4% and detached houses just 14.2%, the realistic spots are an outside wall or a narrow side passage, which is where the IP66 rating and Sigenergy's wall-mounted option come in. The modules weigh 62 kg (6.02 kWh) or 78 kg (9.04 kWh) each, so the wall itself has to be assessed at survey, and in a Haywards Heath flat (27.3% of households there live in purpose-built flats) the freeholder's consent and a place outside the flat come first.
All three town centres sit in UK Power Networks' South Eastern Power Networks area; Horsham's is 2.9 km from the SSEN boundary, so outlying addresses are worth checking. UK Power Networks automatically approves applications where maximum export after any export limitation is under 5 kW, and approved installers notify it of qualifying jobs within 28 days through Smart Connect. Above 16 A per phase the order reverses: Sigenergy's 3.6 kW single-phase controller is rated at exactly 16.0 A (G98), while the 4.0 kW is 18.2 A and needs G99 approval first.
Sussex: sunshine, the grid and local uptake
PVGIS gives the three towns a similar winter, about 139–146 kWh in December, but different summers: about 493 kWh in June at Crawley, 503 kWh at Horsham and 526 kWh at Haywards Heath. DESNZ records about 4,976 solar PV installations across Horsham district (72.67 MW), about 5,845 across Mid Sussex (40.28 MW) and about 2,264 across Crawley (11.06 MW) at the end of 2025. Privately kept plug-in vehicles at the end of June 2026 were about 5,228 in Horsham district (up from 3,924), 5,430 in Mid Sussex (from 4,027) and 2,310 in Crawley (from 1,619). DESNZ also estimates about 22.57% of homes in Horsham district have no mains gas connection (2024).
Ofgem's 2024/25 figures for South Eastern Power Networks show about 42.2 supply interruptions per 100 customers and about 30.4 minutes lost per customer over the year, both inside Ofgem's targets. Backup from a SigenStor needs the Sigen Energy Gateway; a standard installation stops with the grid.
Local facts, sourced
Sigenergy and Sussex in numbers
Every figure below comes from a named public or manufacturer source.
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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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Terraced houses are Crawley's largest housing type at 37.4% of 45,500 households; detached houses are 14.2%.
Source: ONS Census 2021, TS044 accommodation type (censusdata.uk)
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Haywards Heath: 25.4% detached, 26.9% semi-detached and 27.3% purpose-built flats at the 2021 Census.
Source: ONS Census 2021 TS044, Haywards Heath civil parish E04009988 (censusdata.uk)
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June PVGIS output for a 4 kWp due-south array: about 526 kWh at Haywards Heath, 503 kWh at Horsham and 493 kWh at Crawley; December about 139–146 kWh across the three.
Source: PVGIS 5.3 (European Commission Joint Research Centre), PVGIS-SARAH3 2005–2023; 4 kWp, 35° tilt, due south, 14% losses, building-mounted; town-centre runs made 15 October 2026
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About 4,976 solar PV installations (72.67 MW) across Horsham district at the end of 2025.
Source: DESNZ, Renewable electricity by local authority 2014 to 2025 (published 29 September 2026), solar PV sites and capacity, end of 2025, as first published
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Privately kept plug-in vehicles in Mid Sussex rose from about 4,027 to 5,430 in the year to June 2026.
Source: DfT and DVLA, VEH0142 licensed plug-in vehicles by local authority, privately kept, 2026 Q2 against 2025 Q2 (published 23 September 2026)
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About 22.57% of homes in Horsham district have no mains gas connection (2024 estimate).
Source: DESNZ, Subnational estimates of properties not connected to the gas network, 2024 (published 18 December 2025)
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All three town centres are in UKPN's South Eastern Power Networks area; Horsham's is 2.9 km from the SSEN boundary.
Source: UK Power Networks licence boundaries (December 2024) and NESO GB DNO licence areas (May 2024), point-in-polygon on each town-centre point
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 Sigenergy 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, EcoFlow PowerOcean in Sussex and Fox ESS in Sussex.
Sigenergy in Sussex: questions
Can a SigenStor go on the outside wall of a Crawley terrace?
Sigenergy lists the battery modules as floor-standing or wall-mounted and rates the system IP66, so an outside position is within its specification. The practical limits are weight, at 62 or 78 kg per module, the wall's construction, and temperature: Sigenergy's warranty recommends 10–30°C for battery life. A survey decides whether a given wall is suitable.
How much does a SigenStor help with Horsham’s summer generation?
PVGIS puts a 4 kWp due-south array in Horsham at about 503 kWh in June and about 140 kWh in December. In summer a battery moves the midday surplus into the evening; in winter there is little surplus to move, so the stack should be sized to your evening use rather than to the June figure.
Who notifies UK Power Networks for a SigenStor in Sussex?
The installer does. UK Power Networks lets approved installers notify qualifying jobs within 28 days through Smart Connect, and approves automatically where export after any limitation is under 5 kW. Single-phase SigenStor controllers above 3.6 kW are G99 applications that must be accepted before installation.