Tesla Powerwall 3 vs GivEnergy (UK 2026)

The short version

Both products are 13.5 kWh usable, both use LFP (LiFePO4) chemistry, and both are marketed at UK homes with or without solar. Beyond that they differ substantially — and the manufacturer situation matters at least as much as the spec sheet.

Tesla Powerwall 3 is an integrated battery-and-hybrid-inverter with 11.04 kW AC continuous output (UK spec; configurable from 3.68 kW to 11.04 kW, with DNO G99 approval required above 3.68 kW). It stacks up to four units for 54 kWh, or further with Expansion packs. It's installed by Tesla-certified installers, backed by a 10-year manufacturer warranty (internet connection required), and typically comes in at around £8,000–£12,000 fitted for a single unit.

The GivEnergy All-in-One is a 13.5 kWh unit with a lower 3.6 kW or 6.0 kW continuous output depending on variant, AC-coupled to your existing inverter (no integrated solar MPPT). It was marketed with a 12-year manufacturer warranty and, pre-administration, typically fitted for around £11,995. As of July 2026, that manufacturer warranty is not being honoured and no new supply is being produced.

Continuous output and appliance handling

This is the biggest technical gap between the two. Powerwall 3's 11.04 kW UK spec is enough to run a whole household simultaneously — heat pump, electric hob, kettle and EV trickle-charge at once — during on-grid use or in backup, subject to your DNO approving the G99 application above 3.68 kW.

GivEnergy's All-in-One is limited to 3.6 kW or 6.0 kW continuous depending on variant. That's fine for a typical UK home's base load and off-peak charging, but it can be a bottleneck for homes running heat pumps and EVs on the same circuit, and it's a meaningful limit during backup where you can only support a subset of loads.

Solar integration

Powerwall 3 has an integrated hybrid inverter with three MPPTs, which means you can wire solar strings directly into the battery unit without a separate inverter — a genuine cost and simplicity win on new solar+battery installs.

GivEnergy is AC-coupled: it charges from your existing solar inverter's AC output. That's flexible for retrofit onto homes that already have solar with a working inverter, but on a new combined install it means paying for and mounting two boxes instead of one.

Backup power

Powerwall 3 supports whole-home backup when installed with the Tesla Backup Gateway 2. When the grid drops, the gateway isolates the house and the battery keeps the whole consumer unit live within the 11.04 kW output limit, with Storm Watch pre-charging ahead of forecast outages.

GivEnergy supports EPS (Emergency Power Supply) via an optional GIV-AIO-Gateway. This is typically wired as a subset of protected circuits rather than whole-home, and the exact switchover time is not published by the manufacturer.

Warranty and manufacturer support

Powerwall 3: 10-year manufacturer warranty from Tesla, with the standard requirement that the unit stays connected to the internet so Tesla can push firmware and monitor for faults. Tesla is still trading, still shipping units into the UK, and still processing warranty claims via its certified installer network.

GivEnergy: the marketed 12-year warranty is no longer being honoured. Following administration in April 2026, the administrator has confirmed the manufacturer will not honour hardware warranties. If your installer offers residual GivEnergy stock, the only warranty protection you're really buying is their workmanship cover plus — if you pay by credit card — Section 75 of the Consumer Credit Act.

App, software and third-party integrations

Tesla's app is included with the hardware and covers monitoring, backup config, tariff-aware charging and Storm Watch. There's no paid tier for basic functionality.

The GivEnergy app now sits under GivEnergy Software Ltd (a separate entity from the administered manufacturer) and requires a paid 'GivEnergy Premium' subscription for full functionality — some scheduling and monitoring features previously included with the hardware are now behind that subscription.

One genuine strength for existing GivEnergy owners: the published API continues to work, so Home Assistant and Predbat integrations remain functional. That's better than most alternatives at automating charge/discharge around variable tariffs, provided you're comfortable with the setup effort. Powerwall 3 has an official API and a healthy community ecosystem too, but Predbat's most mature support is on GivEnergy.

Expandability

Powerwall 3: stackable up to four units (54 kWh) in a standard install, and further via Powerwall 3 Expansion packs that add capacity without a full second inverter — useful for larger homes or heavy overnight loads.

GivEnergy All-in-One: a fixed 13.5 kWh unit designed to be parallel-stacked with additional AIOs rather than modularly expanded. In the modular Gen 3 range you could scale battery capacity around a separate hybrid inverter, but that's a different topology from the AIO.

Fitted UK prices

Tesla Powerwall 3 typically comes in at around £8,000–£12,000 fitted in the UK depending on installer, backup gateway inclusion and any solar work. Unit-only pricing sits around £6,500 as of mid-2026 (with installers reporting a range of £6,500–£7,800 for hardware alone).

GivEnergy All-in-One was typically fitted at around £11,995 pre-administration. Any residual-stock pricing in 2026 sits below that — but you're not paying for a manufacturer-backed system anymore.

Both benefit from 0% VAT on battery storage installation in Great Britain until 31 March 2027.

Verdict

For a new install in 2026, Powerwall 3 wins decisively. Higher continuous output, integrated hybrid inverter with solar MPPTs, whole-home backup via Backup Gateway 2, up to 54 kWh stackable, and — critically — a manufacturer that still exists and still honours warranty.

GivEnergy remains relevant only for existing owners (whose hardware continues to function and whose third-party integrations remain a strength) and for the handful of buyers who are offered aftermarket or residual-stock units at material discounts. Even then, understand what you're buying: no manufacturer warranty, no guaranteed firmware support, and reliance on installer workmanship cover or Section 75.

Run our battery size calculator to work out the capacity you actually need, then request MCS-installer quotes on Powerwall 3.