Tesla’s own UK prices · the warranty condition · the four decisions that move a quote
Tesla Powerwall 3 Cost in the UK: Tesla’s own prices, and what the warranty requires
The four prices Tesla publishes for the UK, read on 14 October 2026, a named company’s published figure, the warranty clause about who supplies and installs the unit, the decisions that move an installed quote, and the 0% VAT that runs to 31 March 2027.
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Tesla Powerwall 3 cost is a question with a published answer that most pages manage to get wrong, including the often-repeated line that Tesla does not publish a UK price. It does, one click past its marketing page. This page prints those prices exactly as Tesla states them, read on 14 October 2026, alongside the one named-company figure we can attribute, and then does the more useful job: explaining why an installed price for the same battery differs from house to house, and which warranty condition decides whether the ten years is worth what you are paying for it.
What you will not find here is an invented installed range. This page explains the Powerwall 3’s price using Tesla’s own published figures; the battery systems in HCE’s own job photos are EnSmart and Hanchu, and if a Powerwall 3 is the system you want, ask us and we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches. The honest position is that the number for your home comes from a survey of your home, not from an average of other people’s jobs.
Quick answer
Tesla Powerwall 3 cost, in short:
- Tesla’s UK quote page listed one Powerwall 3 at £5,000 without a Gateway and £5,975 with one, and £9,000 or £9,975 with an Expansion unit added, when we read it on 14 October 2026 — excluding VAT, delivery and installation, with the final price set by a Certified Installer
- The cheapest line also requires a Tesla Remote Meter that is not in the price, and Tesla sells no Powerwall through a UK checkout: a quote request goes to a Tesla Certified Installer in your area
- Octopus Energy’s published battery price is £7,999 for a 13.5 kWh Tesla Powerwall 3 — its page does not say whether installation or VAT is included, so it is a battery price, not an installed one
- Tesla’s warranty applies to a Powerwall purchased from Tesla or a Tesla certified installer, and lists installation by anyone else among the grounds on which cover may be voided — ask every company you are considering, us included, how the unit would be supplied, in writing
- Ten years, 13.5 kWh at installation, at least 80% of that capacity at ten years for UK installations, and unlimited cycles only for solar self-consumption, time-based control and backup — anything else is capped at 37.8 MWh
- Backup needs a Backup Gateway 2; the cheaper Remote Meter configuration gives no power in an outage — that one decision moves an installed quote more than any other
- Residential battery installations carry 0% VAT until 31 March 2027, then 5% — fitted with panels or on their own
Sources: tesla.com/en_gb/powerwall/get (read 14 October 2026); Tesla Powerwall Warranty (European Warranty Region) Rev. 1.16, effective 3 December 2025; Tesla Powerwall 3 UK datasheet (2026); Octopus Energy, battery-only installation page (read 14 October 2026); HMRC VAT Notice 708/6.
What Tesla publishes on price
Tesla’s UK Powerwall marketing page carries no price. Its quote page does, and these are the four configurations as it listed them when we read it on 14 October 2026, the same figures it showed on 25 September 2026:
- One Powerwall 3, without Gateway: £5,000* — requires a Tesla Remote Meter (TRM), which is not included in the price.
- One Powerwall 3, with Gateway: £5,975*
- One Powerwall 3 without Gateway, plus one Expansion unit: £9,000*
- One Powerwall 3 with Gateway, plus one Expansion unit: £9,975*
*Tesla’s footnote, in its own words: the figures do not include VAT, delivery, installation, or other costs and fees, and the final price will be provided by a Certified Installer. So the list is a hardware price, not a job price, and the spread between the cheapest line and the dearest is the Gateway and the Expansion unit — the two decisions dealt with below.
The route to buying matters as much as the number. Tesla sells no Powerwall through a UK checkout: you submit a quote request, and a Tesla Certified Installer based in your area contacts you with pricing information and next steps. That is the same certification thread that runs through the warranty, which is why this page deals with it before the datasheet rather than after. Our Tesla Powerwall 3 page explains the unit itself using Tesla’s own published figures; this page is only about the price and the warranty.
A named company’s published figure
One UK company does put a Powerwall figure in public. On its battery-only installation page, read on 14 October 2026, Octopus Energy states that its prices start at £7,999 for a 13.5 kWh Tesla Powerwall 3 battery, on a page that states its prices on an April 2026 and July 2026 basis. The page does not say whether that figure includes installation or VAT, so we describe it as Octopus’s published battery price and nothing more. It is a useful anchor precisely because it is attributable: a named company, a dated page, a stated basis.
What we do not do is print the installed ranges that circulate for this battery. They are averages of other people’s jobs with no stated basis and no date, and a range you cannot trace is not a price you can compare against. For the wider market, the Energy Saving Trust’s Battery storage page (last updated 19 August 2026) puts a home battery at £1,500 to £10,000, with a 5 kWh system at around £4,600, and notes that a typical home system might be 10 kWh. A single Powerwall 3 is 13.5 kWh, so compare it with batteries of its own size rather than with the Trust’s 5 kWh figure; the market-wide picture, battery by battery, is on our solar battery storage cost page.
Why there is no single installed price
Two homes can buy the same 13.5 kWh battery and receive quotes that are honestly different, because four decisions sit between Tesla’s list and the installed figure.
- Backup, or not. A backup configuration needs a Backup Gateway 2; the non-backup configuration uses a Tesla Remote Meter and, in Tesla’s words, provides no backup power during an outage. On Tesla’s list the two single-unit lines are £975 apart before anything is installed. It is the decision that moves the quote most, and it has its own section below.
- An Expansion unit. Tesla’s list moves from £5,000 to £9,000, or from £5,975 to £9,975, when one Expansion is added — £4,000 on the hardware line alone. The datasheet caps a system at four Powerwall 3 units plus three Expansions: seven units, 44 kW and 94.5 kWh. Whether you need more than 13.5 kWh is a consumption question, and the Energy Saving Trust is blunt that there is no exact formula — sizing comes from your own consumption. Our guide to what size home battery you need walks through the arithmetic.
- The output setting and the DNO route. The datasheet lets the output be configured anywhere from 3.68 kW to 11.04 kW at 230 V. 3.68 kW is the G98 line: at or below 16 A per phase, the installer notifies your network operator no later than 28 days after commissioning; above it, a G99 application has to be approved before the work starts, which can change both the timetable and the design. A quote should say which setting it assumes.
- Retrofit design. Where panels already run through their own inverter, the design has to say how the two work together and whether that solar keeps generating into a backed-up home during an outage. A Powerwall fitted with new panels is designed as one system from the start, and the Trust’s point stands: fitting storage at the same time as panels costs less than a separate visit later. The combined picture is on our solar panels and battery cost page.
Then come the ordinary lines any battery quote carries — position, cable route, consumer unit work, mounting, commissioning and certification — which our battery storage page sets out. A battery on its own is not roof work, so a battery-only quote should carry no scaffolding line; what moves the labour is where a 130 kg unit goes and how far that is from your consumer unit.
The warranty condition most pages leave out
The governing document is the Tesla Powerwall Warranty (European Warranty Region), revision 1.16, effective 3 December 2025. Its headline terms are widely quoted and genuinely good: ten years, 13.5 kWh on the initial installation date, at least 80% of that capacity retained at ten years for UK installations, and a warranty that is transferable.
What is rarely quoted is the scope. The warranty applies to a Powerwall that “was purchased from Tesla or a Tesla certified installer in the European Warranty Region”. Among the grounds on which cover may be voided, the document lists storage, installation, commissioning or repair “performed by anyone other than Tesla or a Tesla certified installer”. Tesla then says it directly: “Please contact Tesla if you have any concerns regarding whether you purchased your Powerwall from a Tesla certified installer.”
Read those three sentences together and the ten years stops being a property of the hardware and becomes a property of the supply chain the hardware came through. If the warranty is a large part of why you want this battery, the question to put to every company you are considering, HCE included, is how the unit would be supplied and what warranty attaches to it. Ask for the answer in writing. Check the company against Tesla’s own certified-installer finder. If you ask us about a Powerwall 3, we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches, because nobody should have to take that point on trust.
One further detail from the same document: the enhanced consumer rights in its United Kingdom appendix, the 30-day rejection right and the rule against refurbished parts on repair, are written for consumers who bought directly from Tesla, not through an installer. How battery warranties are written in general, and what actually wears out, is in our guide to how long solar batteries last.
What 80% at ten years and “unlimited cycles” mean
Tesla warrants 13.5 kWh on the initial installation date and, for UK installations, at least 80% of that at ten years — so a unit holding 10.8 kWh at year ten is inside the warranty, not outside it. The cycling allowance is conditional. “Unlimited cycles” applies to three applications: solar self-consumption, time-based control and backup. Any other application, or a combination Tesla does not list, is capped at 37.8 MWh of aggregate throughput instead. If a tariff or a scheme has you cycling the battery for a purpose outside those three, that cap is the number to keep in mind. Full cover also assumes the unit stays connected to the internet for firmware updates, though Tesla commits to at least four years regardless.
For context, the Energy Saving Trust puts a home battery’s typical lifespan at about 10 to 12 years. Tesla’s ten-year, 80% term sits inside that span, which is one reason the warranty carries the weight it does in a Powerwall decision — and why the question of whether it actually attaches to your unit is worth more than any single figure on this page.
Backup: the decision that moves the quote most
A Powerwall 3 keeps a home running in a power cut only when it is installed in a backup configuration, which means a Backup Gateway 2. In the non-backup configuration, which uses a Tesla Remote Meter instead, Tesla’s support page states that the system provides no backup power during an outage. The battery still does the two other things the warranty names, solar self-consumption and time-based control; it simply does nothing for you while the grid is down.
So settle the backup question first, then compare prices. Most of the gap between two otherwise identical Powerwall quotes is this decision, and a quote that does not say which configuration it is for is not yet a quote. If you want backup, ask what the design covers during an outage and, on a retrofit, whether your existing panels keep generating into the backed-up home.
Other battery makers publish their own backup and warranty terms. Our Sigenergy SigenStor and EcoFlow PowerOcean pages set them out as each manufacturer states them, and Sigenergy vs Tesla Powerwall 3 puts the two most-asked-about systems side by side.
Considering a Powerwall 3? Get the warranty answer in writing
Ask us and we will confirm in writing how a Powerwall 3 would be supplied, who installs and commissions it, and what warranty attaches. A free survey settles the backup question, the output setting and the DNO route, and how much storage your usage justifies — itemised and in writing, so it is comparable with anyone else’s.
The datasheet numbers
These are the figures from Tesla’s Powerwall 3 UK datasheet (2026) that get argued about on forums and misquoted on sales pages. Keep them to hand when you read anyone’s Powerwall page, ours included.
- 13.5 kWh usable, which Tesla states as a beginning-of-life minimum at 25°C and 5 kW.
- Output configurable from 3.68 kW to 11.04 kW at 230 V — the lower figure is the G98 line described above.
- Two efficiency figures, not one: 97.5% for solar passing through to the home or grid, and 89% for solar stored in the battery first and then sent to the home or grid. Tesla publishes no figure labelled “round-trip efficiency”, so any page quoting one for this unit is estimating.
- Maximum system: four Powerwall 3 units plus three Expansions — seven units, 44 kW and 94.5 kWh. Design from the datasheet, not from the marketing page.
- 1105 × 609 × 193 mm and 130 kg — the figures that decide where it can go and what has to carry it.
- IP55 enclosure, with IP67 ingress protection on the battery and power electronics, rated for −20°C to 50°C, and under 50 dB(A) typical at one metre.
None of these changes the price on its own. They change the design, and the design is what an installer prices.
VAT and the paperwork
HMRC’s VAT on energy-saving materials and heating equipment (VAT Notice 708/6) zero-rates residential solar panel and battery storage installations in Great Britain — 0% until 31 March 2027, then 5% from 1 April 2027. That applies to a battery fitted with panels and to a battery fitted on its own. Tesla’s list prices exclude VAT; on an installed residential quote the VAT line should read 0% until that date, and it should be visible as its own line rather than folded into a headline. The detail, including what changes after the deadline, is in our guide to VAT on solar panels and batteries.
Grid paperwork is the installer’s job, not yours, but it is worth knowing what it is. At or below 3.68 kW per phase (16 A), the connection is notified to your network operator under G98 no later than 28 days after commissioning; above that, a G99 application is approved before the work starts. The Powerwall 3’s configurable output means the same unit can sit on either side of that line, which is why a quote should state the setting it assumes.
If the Powerwall sits alongside solar panels, export payments under the Smart Export Guarantee need an MCS certificate for the installation and a meter that can take half-hourly export readings; the certificate arrives after the installation is registered. Rates are set by each supplier and must be above zero — they change on short notice, which is why we never print one. If you are adding panels at the same time, our solar panel installation page covers the solar half of the job.
How to compare two Powerwall quotes
Five checks put two quotes on the same footing. First, the configuration: Gateway or Remote Meter, and whether an Expansion is included — it must say so, because Tesla’s own list moves by £975 on the Gateway line and by £4,000 on the Expansion line. Second, the supply-chain and warranty answer, in writing: how is the unit supplied, and does the ten-year warranty attach to it as installed? Third, the output setting and the DNO route the installer intends to use. Fourth, VAT as a visible line at 0%, with the date that rate ends. Fifth, who is doing the electrical work and under which registrations — a quote should name them; for reference, HCE is NAPIT member 73495 and a HIES Consumer Code member (HCE/A/1392), with MCS certification for solar PV via NAPIT, and the NAPIT registration covers solar PV and battery storage.
That is how we quote a battery: a free survey, then a written, itemised price, and no pressure attached; if a Powerwall 3 is the one you want, ask and we will answer the supply-chain and warranty question in writing. Request a free quote or call 0204 547 1892. If the honest answer for your home is a smaller battery, or a different one, we will say so.
Sources: Tesla, tesla.com/en_gb/powerwall/get (UK quote page), read 14 October 2026 — the same figures it showed on 25 September 2026; Tesla, Powerwall Warranty (European Warranty Region) Rev. 1.16, effective 3 December 2025; Tesla, Powerwall 3 UK datasheet (2026); Tesla, Powerwall non-backup configuration support page; Octopus Energy, Introducing battery-only installation with Octopus (published 6 June 2025, prices stated on an April 2026 and July 2026 basis), read 14 October 2026; Energy Networks Association, EREC G98 (Issue 2, 10 March 2025) and G99; Ofgem, Smart Export Guarantee; HMRC, VAT Notice 708/6; Energy Saving Trust, Battery storage (last updated 19 August 2026). All read 14 October 2026 unless stated.
Tesla Powerwall 3 cost: your questions
How much is a Tesla Powerwall 3 in the UK?
Tesla publishes the figures itself, on its UK quote page rather than its marketing page. Read on 14 October 2026, it listed one Powerwall 3 at £5,000 without a Gateway and £5,975 with one, and £9,000 or £9,975 with an Expansion unit added. Those prices exclude VAT, delivery and installation, the cheapest line also needs a Tesla Remote Meter that is not included, and Tesla states that the final price comes from a Certified Installer. The only named-company figure we cite alongside them is Octopus Energy’s published battery price of £7,999 for a 13.5 kWh Powerwall 3, which its page does not describe as including installation or VAT.
How much does a Tesla Powerwall 3 cost installed?
There is no single installed price, and we do not print one. Tesla’s own list is a hardware price that excludes delivery and installation, and the installed figure then depends on four decisions: backup with a Backup Gateway 2 or not, whether an Expansion unit is added, the output setting and the G98 or G99 route it implies, and how the design handles any existing panels and inverter. The installed ranges that circulate online are averages of other people’s jobs with no stated basis, so we do not quote them. Your figure comes from a survey of your home and an itemised quote, with the VAT line at 0% until 31 March 2027.
Does the Tesla warranty depend on who installs it?
Yes, and it is the condition most pages leave out. The Powerwall Warranty for the European Warranty Region, revision 1.16, effective 3 December 2025, applies to a Powerwall that was purchased from Tesla or a Tesla certified installer, and it lists storage, installation, commissioning or repair performed by anyone other than Tesla or a Tesla certified installer among the grounds on which cover may be voided. Tesla invites buyers to contact it if they are unsure whether their seller was certified. Ask any company you are considering, HCE included, how the unit would be supplied, who installs it and what warranty attaches, in writing, and check Tesla’s certified-installer finder.
Do I need the Backup Gateway?
Only if you want the battery to power your home during a power cut. A backup configuration requires a Backup Gateway 2. In the non-backup configuration, which uses a Tesla Remote Meter, Tesla’s support page states that the system provides no backup power during an outage; the battery still does the two other things the warranty names, solar self-consumption and time-based control, it just does nothing while the grid is down. On Tesla’s list the two single-unit lines are £975 apart before installation. Decide this first: it is the biggest single reason two Powerwall quotes differ.
Can I add a Powerwall 3 to existing solar panels?
Yes. A Powerwall 3 can be designed into a home that already has panels, but the design has to say how the battery works with the existing inverter and, if you want backup, whether that solar keeps generating into the backed-up home, which is not automatic. The output setting decides the grid paperwork: at or below 3.68 kW per phase the installer notifies the network operator under G98 after commissioning; above it, a G99 application is approved before work starts. The Energy Saving Trust says fitting storage with panels in one visit costs less than a separate visit later; a well-designed retrofit is still a sound job.
Is there VAT on a Tesla Powerwall?
Not on a residential installation in Great Britain until 31 March 2027. HMRC’s VAT Notice 708/6 zero-rates the installation of energy-saving materials, and battery storage is on that list whether it is fitted alongside solar panels or on its own; from 1 April 2027 the rate reverts to the reduced 5%. Tesla’s own list prices are marked as excluding VAT, so the relevant question for a quote is whether the VAT line is shown at 0% as its own item. Ask for it to be visible; a headline that quietly folds the tax question away is harder to compare than one that answers it.
Weighing up a Powerwall 3 for your house?
Tell us whether you already have panels, what your consumer unit looks like and whether backup matters to you, and a free survey gives you the backup configuration, the output setting and DNO route, whether more storage is justified and the VAT line — itemised, so it is comparable with anyone else’s. If a Powerwall 3 is the one you want, we will confirm in writing how it would be supplied, who installs and commissions it, and what warranty attaches. See also our Tesla Powerwall 3 page and the solar battery storage cost guide.
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