DESNZ records about 1,682 solar PV installations of all sizes across Haringey at the end of 2025, as first published, and some of them are on Wood Green roofs. If one of them is yours, the question now is often whether to add a battery, so that daytime generation covers your evenings instead of being exported. This guide covers how a battery joins an existing array, what to check first, the paperwork with UK Power Networks and the honest cost picture. For our wider approach to storage here, see our page on battery storage in Wood Green.
What the Haringey count tells you
The DESNZ figure covers solar PV installations of every size across the borough, from a single roof to larger commercial systems, with 8.92 MW of capacity between them. It is not a count of homes, of batteries or of Wood Green alone. DESNZ also notes that a large number of 2025 installations could not yet be assigned to a council area when the figures were produced, so Haringey’s count is likely to rise when they are revised. What it does tell you is that solar on Haringey roofs is an established thing, and adding storage to an existing array is a common next step.
Your existing array is your best evidence
A household that already has panels is in a better position than one starting from scratch, because it has real generation data rather than a model. Your generation meter or inverter app shows what your roof actually produced last June and last December. For comparison, PVGIS estimates that a 4 kWp due-south array in Wood Green makes about 3,956 kWh a year: about 475 kWh in June and 478 in July, against about 142 in December and 159 in January. If your own figures sit well below that, shading or orientation is already costing you output, and the battery should be sized to what your roof really makes. Our guide to what size home battery you need explains how to match capacity to that and to your evening use.
This matters most in Noel Park. The estate was built as around 2,000 cottage-style terraces from 1881, and its Article 4 direction, in force since 21 December 2020, withdraws permitted-development rights for solar equipment on street elevations, so arrays there tend to be on the rear slope and modest in size.
Two ways to add storage
The first route keeps your existing solar inverter and adds a battery with its own inverter alongside it. The panels carry on as before, and the battery charges from whatever the house is not using. It suits a newer inverter that still has years of life in it.
The second route replaces the existing inverter with a hybrid inverter that runs both the panels and the battery. It suits an older inverter, or one nearing the end of its warranty, since inverters typically carry shorter warranties than panels. The EnSmart SolarAll system we fit is built around a hybrid inverter of this kind. The survey looks at your inverter’s age and type, the space near your consumer unit and your wiring before recommending either route.
The paperwork when a battery joins
A battery adds equipment that can export, so it goes through the same connection rules as the panels did. Up to 16 A per phase, 3.68 kW, is notified to the network operator under G98, before commissioning or within 28 days of it; anything larger needs a G99 application approved before the work starts. UK Power Networks’ Smart Connect service handles G98 and G99 forms for battery storage as well as solar PV, and only approved installers can use it. UKPN says it automatically approves installations whose maximum export, after any export limitation, is under 5 kW, and if no supply upgrade is needed there is nothing to pay. Wood Green town centre sits in UKPN’s Eastern Power Networks area.
Costs and VAT
The honest downside of adding a battery later is cost: the Energy Saving Trust says fitting storage at the same time as panels costs less than a separate visit. Its figures put a home battery at anywhere from £1,500 to £10,000, with a 5 kWh system around £4,600 and a typical lifespan of about 10 to 12 years. In VAT terms, a battery added to existing panels is treated the same as one fitted with them: residential installations carry 0% VAT until 31 March 2027 and 5% from 1 April 2027. Our guide to battery storage without solar panels covers that VAT position and the tariff arithmetic in more detail.
Wood Green homes without their own roof
Not every Wood Green household has panels to build on. In Woodside ward, 39.3% of households live in purpose-built flats and 26.9% in converted houses, and across Noel Park and Woodside only 29.2% of households own their home, with 30.3% renting socially and 38.5% privately (our sums of the Census 2021 ward counts). For those homes the decision about panels or storage sits with a landlord, a housing provider or a freeholder.
Next step
For the roof side, see our solar panels in Wood Green page, and for the area around it our solar panels in North London hub. If you are working out the full cost rather than just the retrofit, the Energy Saving Trust’s battery figures on our battery storage page give the national cost range. Send us your generation history with a survey request through our contact page and we will tell you plainly whether a battery would earn its place.
Sources: Department for Energy Security and Net Zero, Renewable electricity by local authority 2014 to 2025 (published 29 September 2026), solar PV sites and capacity, Haringey, and note 12 on unallocated installations; PVGIS 5.3, European Commission Joint Research Centre (PVGIS-SARAH3 2005–2023, Wood Green run 15 October 2026); London Borough of Haringey, Noel Park Conservation Area Appraisal and Management Plan and Noel Park Article 4(1) direction (confirmed 17 December 2020); Energy Networks Association, EREC G98 Issue 2; UK Power Networks, Smart Connect, Solar and storage: cost, time and what’s involved, and licence boundaries dataset; Energy Saving Trust, Battery storage (updated 19 August 2026); HMRC, VAT Notice 708/6; ONS Census 2021, TS044 and TS054, Noel Park and Woodside wards, via Nomis.