Tesla Powerwall 3 Costs in the UK

Tesla, the company best known for Elon Musk and its electric vehicles, is a pretty huge name too in domestic battery storage.

So it was an exciting moment when the Powerwall 3 finally made it to UK shores in June 2024. Set to usurp the already-excellent Powerwall 2, Tesla is expecting a lot of demand for the Powerwall 3.

But is the Powerwall 3 worth it? And more importantly, how much does it cost? We’ve covered that below, and we’ve also included helpful information on the major differences between the Powerwall 3 and Powerwall 2.

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Key Takeaways:

• The Tesla Powerwall 3 costs £7,995 + ~£2,800 for installation & hardware.

• Upgrades on the old model include a higher power output, built-in hybrid inverter, AC & DC coupling.

• Capacity: 13.5 kWh storage, 11.5 kW continuous power.

• Backup Power: Works during outages, and supports solar & grid charging.

• Warranty: 10 years, 80% capacity guarantee.

• Scalability: Expandable to 54 kWh.

• Incentives: 0% VAT, SEG earnings possible.

• Durability: Weatherproof, flood-resistant, -20°C to +50°C.

Tesla 3 Specifications:

What is a Tesla Powerwall 3?

A Tesla Powerwall 3 is a solar battery and the latest Powerwall model from Tesla. You can use this solar battery to store energy generated by a solar panel system.

It’s also possible to use this battery to store energy from grid electricity if you don’t have a solar system. You can charge your storage battery during off-peak times to power your home when electricity prices increase during peak demand.

With a Powerwall 3, you can use the stored electricity to power your home at night or when sunlight isn’t strong enough to provide adequate power.

If your Powerwall 3 has enough stored charge, you can in theory keep your home running off of the battery for days at a time. Be aware though that this will be difficult if not impossible if you’re running lots of appliances with high energy demands.

For this, you’d likely need multiple Powerwalls and this can get pretty expensive!

The Powerwall 3 has only been available in the UK as of 19 June 2024 and is, in our opinion, a big improvement over the Powerwall 2 and the definitive choice for solar storage in the UK (see further down for a comparison between the two models).

Check out our Tesla Powerwall 3 installation from start to finish in our YouTube video below:

Tesla Powerwall 3 features

Here’s a list of the standout features of the Tesla Powerwall 3:

• 13.5 kWh storage capacity (100% usable capacity)

• Backed by a quibble free, 10-year warranty

• Up to 11,000w continuous power supply to your home per unit

• Built in climate management, functions between -20°C and +50°C

• Built in hybrid DC inverter with 3 strings, allowing for up to 20 kW of DC panel power per string

• Connect up to four Powerwall 3s, providing 54 kWh of usable storage

• Can be DC or AC coupled

• Works well with heat pumps or air conditioning units

• Expand your Powerwall 3 with 13.5 kWh DC only expansion packs

How much does a Tesla Powerwall 3 cost?

A Tesla Powerwall 3 costs around £6,995 through Heatable (we are Tesla Certified Premium Installers too). You’ll also need to purchase the supporting hardware with it and pay for installation, which combined will add roughly £2,800.

The necessary hardware includes the Gateway, which is a device needed to control the Powerwall 3’s connection to the grid and to monitor your home’s energy consumption.

Most importantly, the Gateway isolates your home from the grid. This is essential because it allows your inverter to operate safely (and legally) during a power cut. Without the Gateway, your Powerwall could feed electricity back to the grid and this can be extremely dangerous for any engineers working on getting the grid working again!

If you need to repair your Powerwall 3, the cost will vary greatly on what needs repairing. It could just be your inverter, which would cost £500–£1,500, or you might need to entirely replace the battery (which makes the 10-year warranty on the Powerwall 3 a huge bonus).

Can you save money with a Tesla Powerwall 3?

You can save money with a Tesla Powerwall 3, because you can store electricity you generate yourself and use it at night, instead of relying on the grid.

It’s important to consider the high upfront cost however, but if you get regular use out of your Powerwall 3 and especially if the price of electricity rises again, you’ll break even pretty quickly.

We estimate that you can pay back the cost of a Powerwall 3 in five to seven years. Keep your Powerwall 3 in good nick, and it’ll last up to twenty years! So after the break-even point, you’ll be in pure profit.

Explore a Battery Storage Case Study: Check out an insightful Q&A session featured in one of our detailed case studies on battery storage. Hear directly from a Heatable customer in the UK and gain valuable perspectives on their experience.

Explore a Battery Storage Case Study: Check out an insightful Q&A session featured in one of our detailed case studies on battery storage. Hear directly from a Heatable customer in the UK and gain valuable perspectives on their experience here.

The image above features a Tesla Powerwall 3 installation performed by our team of Tesla-certified installers at Heatable.

Advantages of a Tesla Powerwall 3

The Tesla Powerwall 3 is a very impressive piece of technology with a whole chunk of benefits we’d love to sing about.

Here’s our list of the advantages of getting a Tesla Powerwall 3:

Energy independence

With a Powerwall 3, you can reduce your reliance on the grid and make a genuinely huge step towards energy independence! If combined with other renewable energy sources, such as solar or hydropower, a Powerwall 3 can help a home go fully off-grid.

Save money on electricity bills

You’ll be paying substantially less on your electricity bills with a Powerwall 3 and helps insulate yourself from the volatility of electricity price rises.

Power your home during an outage

If the power goes out, having a Powerwall 3 means you can keep on as normal. No more fumbling around for candles in the dark!

Solar system integration

It’s easy enough to integrate a Powerwall 3 with an existing solar panel system – no need for complicated rewires or having to reinstall a solar system.

Low maintenance requirements

Tesla built the Powerwall with a mind to keeping maintenance as low as possible. Within the battery itself, there are very few parts that can actually go wrong, so as long as you take good care of it, it’ll keep powering your home for years to come.

Weatherproof

The Powerwall 3 is designed to withstand the elements, so you can easily install it outside without worrying.

Great warranty

You’ll get a 10-year warranty as standard with the Powerwall 3, so if anything goes wrong within this period you’ll be fully covered for a replacement battery.

Smart technology

Monitoring every little detail of your Powerwall 3 is easy with the Tesla App (get it from the App Store and Google Play). You can check important information such as your home’s energy usage and how much your solar panel system is charging your Powerwall 3.

Disadvantages of a Powerwall 3

Despite the numerous benefits of the Powerwall 3, there are a few dealbreakers you should be aware of:

It’s expensive

No other way to put it, the Powerwall 3 costs a chunk of money upfront. Yes, you’ll pay that back after a few years through energy bill savings, but it’s still an initial cost of several thousand pounds.

There are cheaper batteries if you’d rather spend less, though you’ll not get many of the same advanced features you get with a Powerwall 3.

Warranty caveat

It’s great having a 10-year warranty as standard… but your Powerwall 3 has to be connected to the internet without interruptions. There’s a chance Tesla could reduce your warranty to just four years if you choose to disconnect your Powerwall 3 from the internet.

Installation

You’ll need to hire a certified professional to install a Powerwall 3, because if you decide to install it yourself, you’ll void your warranty. Luckily, we’ve got plenty of certified professionals here at Heatable who’re more than qualified to install a Powerwall 3.

Get quotes on installing a new storage battery today.

Tesla Powerwall 2 versus Tesla Powerwall 3

If you’re wondering whether you should save some money and go for the older Tesla Powerwall 2 instead, we’ve compared with the new Powerwall 3 to help you make your mind up:

The Powerwall 2 is alternate current (AC) coupled only: In layman’s terms, this makes it more difficult to integrate with a solar panel system. The Powerwall 3 is both AC and direct current (DC) coupled, so it’s a lot simpler to connect it to an existing solar system!

The electricity generated by solar panels comes in DC form, so they can directly charge a Powerwall 3 without the electricity needing to be converted to AC form.

Powerwall 3s have their own inverter: Having an integrated hybrid inverter is what lets the Powerwall 3 be both AC and DC coupled, and it allows the Powerwall 3 to supply power from your solar panels on demand.

The Powerwall 3 is more than twice as powerful: You’ll get an impressive power output of 11.5 kilowatts (kW) with the Powerwall 3, compared to the 5 kW of the Powerwall 2. This is despite them both having a usable storage capacity of 13.5 kilowatt hours (kWh).

A higher power output translates to you being able to use more devices and appliances in your home simultaneously.

Are there any government grants available for a Tesla Powerwall 3?

There are no government grants available for a Tesla Powerwall 3 at the time of writing (October 2024), but there are financial incentives that could help (albeit indirectly).

As of February 2024, solar batteries have 0% VAT – this is regardless of whether they’re installed with a solar panel system or not.

You might also be able to make some money via the Smart Export Guarantee (SEG), which was set up by the UK government so that certain electricity suppliers will purchase low-carbon electricity from small-scale energy producers.

How long will a Tesla Powerwall 3 last?

A Tesla Powerwall 3 will comfortably last at max energy capacity for 10 years. After that, its energy capacity will start to degrade, as all storage batteries do. You’ll still be able to use the Powerwall to power your home after this 10 year point, but be aware that it’ll slowly store less and less energy.

The 10-year point will likely be reached quicker if you frequently cycle your battery, which means going from full charge to empty (each time you do this is considered a complete cycle).

What can I do to make my Powerwall 3 last longer?

Don’t overcharge your Powerwall 3 or overuse it, because this will put strain on it. You can actually set the max charge rate of your Powerwall 3 via the Tesla app and generally, it’s a good idea to not charge it over 80%.

Equally, you shouldn’t leave the battery at 0% charge for too long either, as this’ll also cause its effective lifespan to shrink.

Also, while you can install the Powerwall 3 outside, it’s probably best to keep it in a cool, dry place.

Can I add a Powerwall 3 to an existing solar system?

Yes, you can add a Powerwall 3 to an existing solar system – there’s no need to get a new solar panel system!

What’s great about the Powerwall 3 is that it acts as both a battery and an inverter, so if you’ve not yet got a solar panel system, the Powerwall 3 means you don’t need to buy a separate inverter.

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Next Steps For Your Battery Journey:

When planning to install battery storage for your home, there are several important factors to consider. Make sure to refer to the following guides to help you make informed decisions:

• What size battery do you need? 

• What is home battery storage? 

• Battery storage without solar panels 

• Pros and cons of battery storage

To dive deeper into these topics, head over to our advice section, check out our YouTube channel for informative videos, or read a customer case study to see how others have benefited from their battery installation. 

Get a Quote for a Tesla Powerwall Today

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