EV owners
More storage means more miles on cheap or free solar energy — and less dependence on expensive peak-rate grid power.
Seen us on YouTube or Facebook? This is your next step.
Tesla Powerwall 3 DC Expansion Pack · UK · Cambridge
Most Powerwall 3 owners
have too little storage.
Fix that now — and claim
up to £750 back.
If you have a Powerwall 3 — or you're about to get one — this is the right moment to size your storage properly. Tesla is paying eligible UK homeowners £375 back per unit, up to £750 total, after installation. The deadline is 30 June. Get the system right. Get the money back.
Get My Battery Quote
Takes around 10 minutes · No obligation · We'll tell you honestly if it's not right for you
Rebate registration closes in
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Install deadline: 31 August 2026
375,000+ YouTube subscribers
Tesla Certified Installer
In-house team
Cambridge · London · South of England
MCS Certified
Time until registration deadline
30 June 2026 — Register & order deadline
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30 Jun 2026 — Register & order deadline
31 Aug 2026 — Installation & claim deadline
Tesla's Next Million Powerwall Programme
How the Tesla Powerwall rebate works.
Tesla hit one million Powerwalls. Their way of saying thank you: £375 back per unit, paid directly to you after installation. Here's exactly what you need to do — and by when.
£375
per Powerwall 3 or DC Expansion Pack — paid as a Virtual Visa® Reward Card after installation
£750 max
Per household (up to 2 units)
30 Jun 2026
Registration deadline
31 Aug 2026
Installation deadline
~10 weeks
To receive your reward card
How to claim in four steps
- Order through a Tesla Certified Installer — we purchase your unit on your behalf before 30 June 2026.
- Register at Tesla's rebate portal — visit teslaenergyreward.com after ordering to lock in your eligibility.
- We install and commission — your system is installed, connected, and registered in the Tesla app before 31 August 2026.
- Submit your final claim — return to the portal, upload documentation, and receive your Virtual Visa® card within approximately 10 weeks.
The rebate is paid by Tesla directly to the homeowner after a successful installation — not deducted from your quote. Eligibility is determined by Tesla. As a Tesla Certified Installer, we guide you through the claim process to maximise your chance of a successful application. Always verify current terms at tesla.com/en_gb/support/energy/powerwall/order/rebate.
Get My Battery Quote
Takes around 10 minutes · Tailored to your home · No obligation
Why This Changes The Numbers
The financial case for acting now.
Most people who want more storage put it off. The price will come down, they think. Here's why that logic breaks down right now.
The Powerwall 3 DC Expansion Pack is already the most cost-effective way to add battery storage — it shares your existing inverter rather than requiring a second full unit.
Add a rebate of up to £750 from Tesla, and the argument for acting now rather than later becomes difficult to ignore.
Get My Battery Quote
Takes around 10 minutes · Tailored to your home · No obligation
Why doing it now makes sense
- Up to £750 back from Tesla — only available for a limited window
- DC Expansion Packs are the lowest cost-per-kWh storage option in the UK
- No DNO application required for up to three Expansion Packs
- Expanding now avoids a costly retrofit as EV and heat pump demand grows
- A correctly sized system performs better on time-of-use tariffs from day one
Why More Storage Pays
The right strategy depends on your tariff.
On Octopus Go, the economics of a larger battery work differently to what most people expect. And as tariffs evolve, more storage gives you more options — not fewer.
On Octopus Go or a cheap overnight rate
Charge cheap overnight. Export solar in the day.
Off-peak import on Octopus Go is around 7–8.5p/kWh. Daytime solar export can earn 12–15p/kWh. With a larger battery, you can fill up cheaply at night — then let your solar export during the day and earn more per unit than you spent importing.
7–8.5p/kWh
Import off-peak overnight
12–15p/kWh
Export solar during the day
Larger battery
= more capacity to run this arbitrage
On a self-consumption or flat-rate tariff
Store your solar. Avoid expensive grid imports.
If you're maximising self-consumption, storing surplus solar rather than exporting at 4–7p/kWh and buying it back at 25–30p/kWh makes strong economic sense — especially for overnight EV charging and heat pump loads.
Free solar
Stored instead of exported at 4–7p
Avoids 25–30p
Grid import for EV & heat pump
Larger battery
Stores more to use through the night
Future-proof your system.
Tariffs change — and they will keep changing. The right strategy today may not be the right strategy in two years. A properly sized battery gives you the flexibility to adapt your approach as the market evolves, without spending more on hardware. That flexibility is the real long-term value of getting the storage sizing right now.
The actual benefit depends on your tariff, usage profile, and solar generation. We review your real data as part of your battery quote so you get a clear picture based on your home — not a generic estimate.
What Is a DC Expansion Pack?
More storage. Same system. Lower cost per kWh.
The Powerwall 3 DC Expansion Pack connects to your existing Powerwall 3, adding 13.5kWh of storage without requiring a second inverter — making it significantly more affordable per kWh than a second full unit.
Each pack adds 13.5kWh of usable capacity and increases your charging rate from 5kW to 8kW, so you capture more solar before it exports. You can add up to three packs per Powerwall 3, scaling total capacity to 54kWh — all managed through the same Tesla app.
No DNO application is required for up to three packs. There are commissioning and ordering details that many installers miss — we documented the full process on YouTube so you can see exactly how it should be done.
- Storage per pack13.5 kWh
- Max packs per Powerwall 33 packs (54 kWh)
- Charging rate (with expansion)Up to 8 kW
- Continuous output power11 kW
- Depth of discharge100%
- DNO application?No (up to 3 packs)
- Tesla rebate eligible?Yes — £375 per pack
- Typical installation2–3 hours
DC Expansion Pack vs a second Powerwall 3 — which is right for you?
| DC Expansion Pack Recommended | Second Powerwall 3 | |
|---|---|---|
| Extra storage added | 13.5 kWh per pack | 13.5 kWh |
| Includes own inverter? | No — uses existing (lower cost) | Yes (adds cost) |
| Cost per kWh added | Lower — most affordable UK option | Higher |
| DNO application needed? | No (up to 3 packs) | Usually yes (G99) |
| Increases output power? | No (11kW maintained) | Yes (+11kW per unit) |
| Tesla rebate eligible? | Yes — £375 per pack | Yes — £375 per unit |
| Best for | Maximising storage efficiently | Homes needing more power output |
Not sure which is right for your home? We assess this as part of your battery quote — no obligation.
Who This Is For
The homes that benefit most.
If any of these sound like you, a DC Expansion Pack will almost certainly pay for itself.
Heat pump homes
Running a heat pump on stored solar reduces reliance on peak-rate electricity. Getting sizing right from the start is critical to making the numbers work.
High-usage households
If your Powerwall hits 100% before noon or runs out by evening, you're exporting solar at 4–7p/kWh and buying it back at 25–30p. More storage closes this gap.
Backup-focused homes
More storage means longer runtime during grid outages. Proper sizing ensures your home stays on throughout — not just for a few hours.
The Cost of Getting It Wrong
What happens if you don't size it properly.
Getting this wrong isn't a one-off mistake. It's a monthly one — showing up on your electricity bill, every month, until you eventually pay to fix it.
Battery runs out every evening
A single Powerwall 3 covers most summer evenings. In winter with an EV or heat pump, it empties early — leaving you on expensive grid rates when you expected self-sufficiency.
You export cheap, buy expensive
Without enough storage, solar spills to the grid at 4–7p/kWh. You buy it back at 25–30p. More storage closes this gap and transforms your tariff returns.
Backup doesn't last when needed
13.5kWh supports a typical home for roughly one day. Add an EV or heat pump and that window shrinks fast. Undersizing means the backup you expected isn't there.
A costly retrofit later
Adding storage in a second visit — once cables are routed and brackets are set — costs considerably more than planning for it properly the first time.
Missing the rebate entirely
The Tesla rebate requires registration by 30 June 2026 and installation by 31 August 2026. Waiting means paying full cost with no rebate available.
Time-of-use tariffs don't deliver
Octopus Agile or Intelligent Go need enough storage to charge fully overnight. Too little capacity defeats the entire tariff strategy.
“The cost of undersized battery storage isn’t paid on installation day. It’s paid every month, on every electricity bill, for the next fifteen to twenty years.”
What We Provide
Powerwall 3 & DC Expansion Pack — designed properly.
In-House Team · Tesla Certified · Cambridge & UK-wide
Tesla Powerwall 3 DC Expansion Pack Installation
Every enquiry starts with a proper review of your existing setup, consumption data, and goals — so what we recommend is right for your home specifically.
What our DC Expansion Pack service includes:
- System suitability check — we assess your existing Powerwall 3 setup before recommending anything.
- Battery sizing recommendation — how many Expansion Packs your usage profile actually warrants, based on real data.
- Expansion vs second Powerwall 3 guidance — we tell you which is right for your power requirements, not what earns more margin.
- Rebate eligibility guidance — we walk you through the Tesla claim process so your application is set up correctly from the start.
- Full installation by our in-house team — no subcontracting on core works, ever.
- Commissioning and Tesla app setup — fully configured, tested, and explained before we leave.
- MCS certification and all documentation — for your records and your rebate claim.
Register by 30 June 2026 to qualify for the £375 rebate per unit
Get My Battery Quote — Claim Up to £750Takes around 10 minutes · No obligation · We'll advise against expansion if it's not right for you
Real Installations. Real Results.
This is our actual work.
These photographs are from a real Artisan Electrics DC Expansion Pack installation — the same job documented in our YouTube video. Three Tesla units, properly installed, properly commissioned.
Completed install — Powerwall 3 + two DC Expansion Packs
Artisan Electrics engineer installing a DC Expansion Pack — branded uniform, professional workmanship
What Our Customers Say
Real homeowners. Real installations.
Watch what our customers say about their Artisan Electrics installation — in their own words, on camera.
“I went to YouTube, watched a lot of their videos, spoke to them, and they were very professional compared to the rest. They told me themselves they're not going to be the cheapest — and for me that's always a good sign. Since having the system installed it's generated 5.4 megawatt-hours. My decision to invest in renewable energy has been one of the best I've made in a long time.”
“I saw on YouTube that they'd installed several similar systems and I liked the quality of the work. In the last year my system has generated just under 10.5 megawatt-hours. If you just want the job done properly and done once, that's what the company does. And if I was doing the whole project over again, the only thing I would really do differently is put in more battery capacity upfront.”
“A member of my family is an electrician and he said, 'Before you make a final commitment, you must have Artisan have a look — I've heard excellent reports about them.' The installation work carried out by Artisan has been an absolute delight. The system has more than exceeded my expectations. I can't imagine dealing with a better company.”
Why Artisan Electrics
We've shown you the work. On camera.
Artisan Electrics engineer on a live DC Expansion Pack installation
- Tesla Certified InstallerAuthorised to purchase and install Powerwall 3 and Expansion Packs within Tesla's rebate programme — essential for your claim to be valid.
- In-house team throughoutNo subcontracting on core works. The engineers who understand your system are the engineers who install it.
- We know the commissioning detailWe filmed the expansion process, identified failure points, and documented the correct sequence. Your install will be done right, first time.
- Design-led, not sales-ledIf an Expansion Pack isn't right for your setup, we'll tell you before you spend money on the wrong solution.
- Cambridge-based, MCS certifiedServing the East of England, London, and the South of England. Full MCS documentation on every install.
Who This Is For
Not for everyone. By design.
This page is for people who've already decided they want it done properly. If you're still at the research stage, the FAQ is below — come back when you're ready.
This is right for you if…
- You have a Powerwall 3 and want to add storage capacity
- You're installing a new Powerwall 3 and want to spec it correctly from day one
- You have high usage — EV, heat pump, or a large household
- You want a properly designed system, not the cheapest available quote
- You're ready to proceed before the 31 August 2026 installation deadline
This is probably not right if…
- You're looking for the cheapest installer available
- You're researching casually with no near-term intention to install
- You expect guaranteed savings figures before a full system review
- Your installation would fall outside the August 2026 rebate deadline
Questions
Frequently asked questions.
How much does a Powerwall 3 DC Expansion Pack cost installed in the UK?
Fully installed costs for a Powerwall 3 DC Expansion Pack in the UK typically range from around £4,500–£5,500 per unit, depending on your existing setup and any additional electrical work required. Get a quote for an accurate figure based on your specific property and Powerwall configuration.
The Tesla rebate reduces your effective cost by £375 per unit (up to £750 for two units) once your claim is approved — so factor that into your comparison. The quote itself is free and takes around 10 minutes.
How does the Tesla Powerwall rebate work in the UK?
Tesla's Next Million Powerwall Programme offers eligible UK homeowners £375 back per Powerwall 3 or Powerwall 3 DC Expansion Pack, up to £750 per address. It is paid as a Virtual Visa® Reward Card after installation — not an upfront discount. To claim, order through a Tesla Certified Installer, register at teslaenergyreward.com by 30 June 2026, have your system installed by 31 August 2026, and submit your final claim by 31 August 2026.
What is a Powerwall 3 DC Expansion Pack?
A Powerwall 3 DC Expansion Pack is a battery-only unit that connects to an existing Powerwall 3, adding 13.5kWh of storage. It has no inverter of its own — it uses the existing Powerwall's inverter — making it more cost-effective per kWh. You can add up to three packs per Powerwall 3, for a total of 54kWh.
Can I add a DC Expansion Pack to my existing Powerwall 3 later?
Yes — Expansion Packs can be retrofitted to an existing Powerwall 3 at any time. However, adding storage in a second visit costs more than planning for it during the initial installation, and waiting beyond August 2026 costs you up to £750 in unclaimed rebate.
Is the Tesla Powerwall 3 worth it in the UK?
For homes with solar and high electricity usage — particularly those with EVs or heat pumps — the Powerwall 3 is one of the most capable home battery systems available in the UK. Its integrated inverter, 11kW continuous output, and expandable architecture suit high-demand properties well. Whether it is right for your specific home depends on your consumption profile and goals.
Do I need solar panels to install a Powerwall 3?
No. The Powerwall 3 can operate as a standalone battery, charging from the grid during cheap off-peak tariff periods. However, the economics are significantly stronger when paired with solar — self-generated energy combined with time-of-use optimisation produces the best financial returns.
How much battery storage does my home need?
A typical UK home uses 8–12kWh per day, so a single Powerwall 3 (13.5kWh) covers basic needs. Add an EV needing 10–20kWh overnight, or a heat pump drawing 5–10kWh daily in winter, and 27kWh or more becomes the appropriate starting point. The right answer depends on your actual consumption — we review this as part of your quote.
Act Before The Deadline
The rebate is real. The deadline isn't moving. Let's get your system right.
The quote takes 10 minutes. The regret of undersizing takes years.
Get My Battery Quote
Takes around 10 minutes · No obligation · We'll tell you honestly if it's not right for you
The rebate deadline is 30 June 2026.
The quote is free and takes 10 minutes. If expansion isn't right for your setup, we'll tell you before you spend anything. But the rebate window closes 30 June — and there's no indication it will be extended again.
Get My Battery Quote
No obligation · We'll be honest if it's not right for you
Or call us: 01223 968001