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. 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. Sam's Solar Journey: Request a quotation from Spirit Energy: ? Watch on of our client's solar journey which shows the process of getting solar from point of enquiry through to the design, survey, modelling, project management, installation, and handover: 01:05 Tesla Powerwall 3 Battery Specification 02:29 Powerwall 3 Expansion Pack 03:17 Tesla Powerwall 3 Charge Rate 04:34 Installing Powerwall 3 Expansion Packs 07:49 Tesla Powerwall 3 Hybrid Inverter 08:22 Tesla Powerwall 3 Inverter Rating 08:28 Tesla Powerwall 3 Load Startup 09:18 Tesla Powerwall 3 Solar MPPT Inputs 09:48 How many solar panels can you install on Tesla Powerwall 3? 10:38 Tesla Powerwall 3 DNO 11:09 Tesla Powerwall 3 Inverter Ratings 12:06 Tesla Powerwall Gateway 12:34 Tesla Powerwall 3 Power Cut Protection 13:38 Tesla Powerwall 3 3 Phase Backup 14:48 Tesla Powerwall 3 App 16:26 Tesla Powerwall 3 API 16:44 Tesla Powerwall 3 Net Zero App 17:30 Tesla Powerwall 3 Algorithm 18:10 Tesla Powerwall 3 Active Thermal Management 20:23 Tesla Powerwall 3 Storm Watch 20:55 Tesla Powerwall 3 Build Quality & Flood Resistance 21:21 How big is Tesla Powerwall 3? 21:45 Tesla Powerwall 3 Round Trip Efficiency 22:24 DC Vs AC Coupling 23:36 Tesla Electric 23:59 Tesla Virtual Power Plant 24:51 Tesla Powerwall 3 Warranty 27:24 Tesla Powerwall 3 Reliability 28:06 Conclusion. Should you get Tesla Powerwall 3? 28:30 Tesla Powerwall 3 Vs Sigenergy & GivEnergy Visit our website - Try our Free Solar Calculator - Try our Free Battery Storage Calculator - Follow us on LinkedIn - Follow us on Instagram - Follow us on Facebook - Follow us on X / Twitter -