Spirit Energy installed the first Tesla Powerwall 3 in the UK. We also won the Tesla Installation Excellence Award in 2024 for the quality of our work installing Powerwall 3.
In this full-length guide, we go into every detail of the Tesla Powerwall 3 - Tesla’s latest home battery system, newly launched for the UK market. This is not a teaser or a teaser’s teaser. It’s a complete walkthrough, covering the hardware, the software, and what it all means for real-world homes.
We begin with the battery specification itself - usable capacity, charge and discharge rates, and internal chemistry. We explain how the Powerwall 3’s hybrid inverter is now integrated into the unit, allowing for a truly all-in-one installation with solar, storage and backup power from a single device.
For those planning to scale, we cover the Powerwall 3 Expansion Pack, and how it connects to the primary unit without duplicating inverter capacity. We examine solar PV integration, including the number of panels you can connect, how the system handles DC vs AC coupling, and how many MPPTs are available.
There’s detailed coverage of DNO considerations, load startup capability, and the unit’s ability to support three-phase backup – essential knowledge for installers and advanced users. We also walk through the Tesla Gateway, Power Cut Protection, and Active Thermal Management, helping you understand how the unit performs in both peak summer heat and mid-winter frost.
Beyond the hardware, we explore the Tesla App, API integration, Net Zero tracking, Storm Watch, and the Virtual Power Plant – tools that bring the system to life and offer significant value beyond energy storage alone.
Finally, we compare the Powerwall 3 to its most serious competitors in the UK: the Sigenergy SigenStor and the GivEnergy Hybrid All-in-One, analysing how they stack up in terms of specs, flexibility, and real-world deployment.