For UK new builds, the three best battery storage products in 2026 are: Tesla Powerwall 3 (best for whole-home backup, £6,500), GivEnergy All-In-One (best UK-made, £5,800) and SunSynk modular (best for matched inverter, £3,200/module).
Five batteries commonly fitted on UK new builds
| Product | Capacity | Power (continuous) | Installed cost | Warranty |
|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 11.5 kW | £6,500 | 10 yr |
| GivEnergy All-In-One | 13.5 kWh | 6.0 kW | £5,800 | 12 yr |
| SunSynk 5.32 kWh | 5.32 kWh (stackable) | 5 kW per module | £3,200 | 10 yr |
| SolaX T-BAT 5.8 | 5.8 kWh (stackable) | 3.3 kW | £3,400 | 10 yr |
| Pylontech US5000 | 4.8 kWh (stackable) | 3.7 kW | £2,200 | 10 yr |
MCS certifies the installer and the PV system rather than batteries, so check the battery against the installer’s paperwork and your warranty provider’s requirements. All install in a utility room, garage or plant room (battery in habitable rooms is generally not warranty-accepted). 0% VAT applies on all battery installations to new dwellings.
Tesla Powerwall 3 — for whole-home backup
Tesla Powerwall 3 is the most-installed premium home battery in UK new builds — driven by the strongest continuous power output (11.5 kW vs ~6 kW for most competitors), polished smartphone app, and integral solar inverter on the same unit.
Strengths: Whole-home backup when paired with a Tesla Backup Gateway (rated for grid disconnection during outages); highest continuous power for ASHP + EV concurrent loads; integral 6 kW PV inverter on the same unit reduces install complexity; mature monitoring/automation app.
Limitations: Requires Tesla-approved installer network (smaller than GivEnergy or SunSynk); 10-year warranty vs GivEnergy 12-year; UK supply chain availability has fluctuated through 2024-26.
GivEnergy All-In-One — best UK-made solution
GivEnergy is the UK\'s largest domestic battery manufacturer (Wolverhampton-based), with the largest UK installer network and strongest support ecosystem. The All-In-One unit combines battery, inverter, BMS and monitoring in a single floor-standing cabinet.
Strengths: Longest warranty in the segment (12 years); UK-based manufacturer and support; integrates cleanly with GivEnergy hybrid inverters at install (no separate inverter needed); excellent open API for home automation integration (Loxone, Home Assistant, Hubitat).
Limitations: Lower continuous power output (6 kW vs Powerwall 11.5 kW) limits whole-home backup capability under high-load conditions; large floor footprint (1.0 × 0.6 m) requires plant room or utility-room allocation; smartphone app less polished than Tesla.
SunSynk modular — best for stacked sizing
SunSynk\'s modular battery range pairs with their inverter system to deliver scalable capacity (5.32 kWh per module, stacked up to ~26 kWh). The right choice when the new build already specifies a SunSynk inverter and the homeowner wants to start with smaller capacity and add later.
Strengths: Lowest entry cost per module; modular expansion as needs grow; matched-pair compatibility with SunSynk hybrid inverters (no compatibility risk); wall-mounted (smaller footprint than floor-standing).
Limitations: Requires SunSynk inverter for cleanest integration; cumulative cost for larger capacity (3 × 5.32 kWh = 15.96 kWh at £9,600 — more than Powerwall 3 13.5 kWh at £6,500); less mature app than Tesla or GivEnergy.
How much battery storage does a new build need?
| House type | PV size | Annual demand | Recommended battery |
|---|---|---|---|
| 3-bed semi | 3.4 kWp | 4,500-6,500 kWh | 10-13 kWh |
| 4-bed detached | 5.2 kWp | 7,000-9,500 kWh | 13-16 kWh |
| 5-bed executive (1 EV) | 7.6 kWp | 11,000-14,000 kWh | 16-20 kWh |
| 5-bed (2 EVs + home office) | 8-10 kWp | 14,000-18,000 kWh | 20-26 kWh |
For a fixed-price battery + PV package quote on your new build, request a free consultation. For sizing detail by ground floor area, use the FHS PV calculator.