In the rapidly evolving world of renewable energy, Tesla continues to lead the charge with its cutting-edge home battery technology. The Tesla Powerwall 3 (which officially launched in the UK on June 18th, 2024) is the latest iteration in the series, offers even greater efficiency, storage capacity, and performance than its predecessors. Whether you’re looking to reduce reliance on the grid, store excess solar energy, or gain backup power during outages, the Powerwall 3 is a game-changer for home and business owners alike.

In this guide, we’ll dive into what the Powerwall 3 is, explore its key features and specifications, and cover everything you need to know if you’re considering this innovative energy storage solution.

What Is the Tesla Powerwall 3?

The Tesla Powerwall 3 is a rechargeable lithium-ion battery designed for residential and small commercial energy storage. It works by storing energy, either from solar panels or the grid, and making it available for use when needed. The Powerwall 3 is the successor to the popular Powerwall 2, but it boasts several improvements, including higher storage capacity, integrated solar inverter capabilities, and better efficiency.

The Powerwall is primarily designed to store excess solar energy generated during the day for use at night or during periods of low sunlight. It also provides backup power during grid outages, keeping essential appliances and systems running. By using stored energy during peak rate times, it can help reduce electricity bills and enhance energy independence, particularly when paired with solar panels.

Key Features of the Powerwall 3

Tesla has made several significant upgrades with the Powerwall 3, making it more powerful and efficient than previous versions.

One of the standout features is its increased storage capacity. The Powerwall 3 offers a substantial 13.5 kWh of usable energy, the same as the Powerwall 2. However, its improved system architecture allows for greater scalability. Unlike its predecessor, which had limitations in multi-unit configurations, the Powerwall 3 makes it easier to stack multiple units together, providing flexible storage expansion for larger homes or businesses with higher energy demands.

A major upgrade with the Powerwall 3 is its integrated solar inverter. Unlike the Powerwall 2, which required a separate inverter, the Powerwall 3’s all-in-one design simplifies the installation process. This reduces the need for additional hardware, making installation faster and more cost-effective.

The Powerwall 3 also offers significantly higher power output. It delivers 11.5 kW of continuous power when connected to solar, compared to the Powerwall 2’s 5 kW. Without solar, it provides 5 kW of continuous output. For short surges, it can handle up to 30 kW of peak output, making it more capable of powering high-demand appliances during outages or heavy usage periods.

Another key enhancement is its improved efficiency. The Powerwall 3 boasts a round-trip efficiency rating of approximately 97.5%, meaning minimal energy is lost during the storage and discharge process. This ensures you get the maximum benefit from the energy you generate or store.

When it comes to backup power, the Powerwall 3 seamlessly detects power outages and automatically switches to backup mode. It can keep essential appliances running, such as refrigerators, lights, Wi-Fi routers, and heating systems. With its increased power capacity, it can even support more energy-intensive appliances, like EV chargers, making it a robust solution for uninterrupted power during blackouts.

The Powerwall 3 also integrates seamlessly with the broader Tesla ecosystem. If you own a Tesla solar system or electric vehicle, you can manage and monitor your energy usage through the Tesla app. The app allows you to track real-time energy consumption, optimise self-consumption, and adjust settings remotely.

Finally, the Powerwall 3 is designed for both indoor and outdoor installation. It has a water and dust resistance rating of IP67, making it highly durable, even in harsh weather conditions. Its sleek, wall-mounted design ensures it remains discreet and space-efficient.

Technical Specifications

Here’s a quick overview of the technical specifications:

The Powerwall 3 offers a usable capacity of 13.5 kWh with a continuous power output of 11.5 kW when connected to solar, and 5 kW without solar. For short bursts, it delivers a peak output of 30 kW. With a round-trip efficiency of around 97.5%, it minimises energy loss during the charge and discharge cycle.

Weighing approximately 130 kg, the Powerwall 3 measures 1100 mm x 610 mm x 150 mm, making it compact yet powerful. It operates efficiently in temperatures ranging from -20°C to 50°C and carries an IP67 rating for water and dust resistance, making it suitable for both indoor and outdoor installation.

Multiple units can be connected together to scale up storage capacity, making it ideal for larger properties or commercial settings. Tesla offers a 10-year warranty, giving customers peace of mind regarding its longevity and reliability.

* Read the complete Techincal Specification sheet here.

How Does the Powerwall 3 Compare to the Powerwall 2?

While the Powerwall 2 has been a market favourite for years, the Powerwall 3 offers several notable improvements.

The Powerwall 3 features the same 13.5 kWh storage capacity as the Powerwall 2 but delivers more power. With 11.5 kW continuous output (when solar-connected) compared to the Powerwall 2’s 5 kW, it is significantly more powerful. Its peak output of 30 kW also far surpasses the Powerwall 2’s 7 kW.

One of the most significant differences is the integration of the solar inverter, making the Powerwall 3 easier and more cost-effective to install. It also has a higher efficiency rating of around 97.5%, compared to the Powerwall 2’s 90%, ensuring you get more usable energy from every charge.

With an improved IP67 weather resistance rating, the Powerwall 3 is more durable than the Powerwall 2, which had an IP56 rating. This makes it better suited for outdoor installations, especially in areas with harsher weather conditions.

	Powerwall 2	Powerwall 3
Usable Capacity	13.5 kWh	13.5 kWh
Continuous Power Output	5 kW	3.68 kW – 11.04 kW
Peak Output	7 kW	30 kW
Integrated Inverter	No	Yes
Efficiency	~90%	~97.5%
Weather Resistance	IP56	IP67
Weight	114 kg	130.18 kg
Installation	More complex due to inverter	Easier, single unit design.
Warranty	10 years	10 years all-inclusive + 80 capacity guarantee
Dimensions (H x W x D) (mm)	1,150 x 753 x 147mm	1,098.6 x 609.6 x 193.04mm
Scalable	Up to 10 Powerwalls (135kWh)	Up to 44kW AC output, 216kWh of storage on a single-phase supply with expansion packs
More Information	Datasheet	Datasheet

Powerwall 3 Pricing vs Powerwall 2

The Tesla Powerwall 3 is priced at approximately £9,500 for a single unit, including installation costs. This is slightly more expensive than the Powerwall 2, which typically costs around £8,000 to £8,500 installed. However, the Powerwall 3 offers better value due to its higher power output, integrated inverter, and improved efficiency.

Because the Powerwall 3 comes with a built-in solar inverter, customers installing new solar systems will save money by not needing to purchase a separate inverter, which adds to its overall cost-effectiveness. For those expanding existing systems, the Powerwall 2 may still be a viable option, but the Powerwall 3’s superior performance makes it the more future-proof solution.

Tesla Powerwall Price in the UK	*After VAT and Labour
Tesla Powerwall 3	£7,800 – £9,500
Tesla Powerwall 2	£5,800 – £8,500

*prices are subject to change, these figures are true to the time of this guide being written (march 2025)

Tesla currently quotes ~£5,500 for the Powerwall 3 + ~800 for the backup gateway. However, this price is excluding the extra cost for delivery, installation and VAT. Domestic properties have a VAT rate 0% in the UK for the installation of solar and battery storage. This is until 31st March 2027; unless the government introduces further legislation to extend the implementation.

Benefits of Installing a Tesla Powerwall 3

Investing in the Powerwall 3 offers a range of benefits, making it a smart choice for homeowners and businesses alike.

One of the key advantages is energy independence. By storing excess solar energy, you can reduce your reliance on the grid and make use of stored power during peak-rate times or outages. This not only cuts your electricity bills but also protects you from fluctuating energy prices.

The Powerwall 3 also provides reliable backup power. During outages, it ensures that essential appliances, such as fridges, lights, and internet systems, keep running smoothly. Its higher power output means it can handle larger loads, making it particularly useful for properties with higher energy demands.

By installing a Powerwall 3, you can also enhance your sustainability efforts. It maximises the use of renewable energy, reducing your carbon footprint by allowing you to consume more of the clean energy you generate.

The Tesla app makes energy management easy, providing real-time insights into your energy usage, battery levels, and solar production. With remote access, you can control and adjust settings from anywhere.

Is the Powerwall 3 Right for You?

If you’re considering adding a battery storage system to your home or business, the Powerwall 3 is an excellent choice, particularly if you already have or are planning to install solar panels. Its higher power output, integrated inverter, and improved efficiency make it a future-ready solution for those seeking greater energy independence.

For homeowners, it offers reliable backup power, lower energy bills, and increased self-sufficiency. For businesses, it provides scalable storage, helping reduce operational costs and ensuring continuity during power disruptions.

The Future of Home Energy Storage

The Tesla Powerwall 3 is an extremely powerful and versatile energy storage solution designed to help homeowners and businesses maximise their solar investment, reduce electricity costs, and gain peace of mind during outages. With its enhanced power output, integrated inverter, and scalability, it offers significant improvements over previous models.

Whether you’re aiming for energy independence, lower bills, or simply a reliable backup power source, the Powerwall 3 is a smart investment that brings long-term benefits. It’s not just a battery, it’s a smarter and more efficient way to manage and control your energy.