Your Premium Tesla Powerwall Installers
Infinity Energy Services is one of the UK’s few officially certified Premium Tesla Powerwall installers, serving the whole of Hampshire from our head office in Southampton.
We specialise in the design and installation of the new Tesla Powerwall 3.
Our expert team provides a complete service, including the new modular Expansion Packs and the affordable Non-Backup configuration.
As Hampshire’s most experienced installation team, we provide trusted, expert design and installation to help you cut your energy bills and achieve true energy independence.
This guide explains your new Powerwall 3 options, installation costs, and our trusted local process.
by David Lewis | published 15 November 2025
– TABLE OF CONTENTS –
Why Choose a Premium Installer for Your Hampshire Powerwall?
What is the New Tesla Powerwall 3?
A Powerwall 3 for Every Need: New Configurations
How Much Does a Tesla Powerwall 3 Cost in Hampshire (2025)?
Our 4-Step Tesla Powerwall Installation Process
Powerwall for Businesses in Hampshire
When investing in a system like Powerwall, the quality of your installer is paramount.
Tesla has different tiers for its installer network, and Infinity Energy Services has earned the highest designation: Tesla Premium Installer.
This isn’t just a label. It’s your guarantee. It signifies that our team has undergone the most advanced training directly with Tesla, has a proven track record of high-quality installations, and provides an exceptional level of customer service.
Choosing a ‘Premium’ installer ensures your system is designed and fitted perfectly to maximise its performance and lifespan.
Hampshire’s Most Trusted Energy Team
Our head office is right here in Hampshire, and our reputation is built on trust. We aren’t a faceless national company; we are your local experts.
We are proud of our excellent feedback ratings on Google Reviews, Checkatrade and Trustpilot, reflecting thousands of happy customers.
See Our Installations Across Hampshire
We have completed hundreds of solar and battery installations for homeowners and businesses across Hampshire.
Our portfolio includes successful projects in Southampton, Portsmouth, Basingstoke, Winchester, Eastleigh, and across the New Forest.
What is the New Tesla Powerwall 3?
Released in the UK in 2024, the Tesla Powerwall 3 is a significant upgrade to the world’s most popular home battery.
The biggest change is its new integrated hybrid solar inverter. This powerful 11.04 kW inverter means that for new solar panel systems, you no longer need a separate solar inverter. The Powerwall 3 handles everything.
This simplifies your installation, reduces cost, and increases round-trip efficiency.
Powerwall 3 vs. Powerwall 2: What’s the Difference?
The primary difference is that the Powerwall 3 is the new, more powerful successor, while the Powerwall 2 is the successful legacy model that has been phased out by Tesla.
- Powerwall 3: This is the new standard for all installations. It has a 11.04 kW integrated inverter, making it perfect for new solar systems (a ‘DC-coupled’ installation). Crucially, it can also be ‘AC-coupled’ to be retrofitted to existing solar panel systems.
- Powerwall 2 (legacy): This model has been discontinued by Tesla. It was an ‘AC-coupled’ battery, meaning it was designed only for homes that already had their own solar inverter.
Powerwall 3’s flexibility to handle both new installations and retrofits, combined with its much higher power output, makes it the clear successor. A key point to note is that Powerwall 3 and Powerwall 2 systems are not compatible with each other and cannot be mixed.
FEATURE | TESLA POWERWALL 3 (NEW MODEL) | TESLA POWERWALL 2 (LEGACY MODEL) |
Best For | New Solar & Retrofits | Retrofitting (Discontinued) |
Inverter | Integrated 11.04 kW Hybrid Inverter | None (AC-Coupled) |
Power Output | 11.04 kW continuous | 5 kW continuous |
Scalability | Up to 4 units + Expansion Packs | Up to 10 units |
Coupling | DC (New Solar) or AC (Retrofit) | AC only |
Tesla Powerwall 3: Key Specifications
- Usable capacity: 13.5 kWh
- Power output: 11.04 kW continuous
- Inverter: Integrated Hybrid Inverter with 3 MPPTs (solar inputs)
- Scalability: Yes, up to 4 units (54 kWh total)
- Installation: Indoor or Outdoor (IP67 rated, flood resistant)
- Warranty: 10-year all-inclusive, unlimited cycles
A Powerwall 3 for Every Need: New Configurations
The Powerwall 3 is more flexible than ever. As Premium Installers, we can design a system that perfectly matches your home’s needs and budget, using two major new innovations:
Future-Proof with Powerwall 3 Expansion Packs
Previously, if you wanted to increase your storage, you had to add an entire second Powerwall. Not anymore.
The Powerwall 3 is a modular system that supports Expansion Packs.
An Expansion Pack is a 13.5 kWh ‘add-on’ battery that connects directly to your main Powerwall 3 unit.
It doesn’t have its own inverter, which makes it a much more cost-effective way to add capacity.
You can add up to three Expansion Packs to a single Powerwall 3, allowing your system to grow from 13.5 kWh to 27 kWh, 40.5 kWh, or even 54 kWh as your family’s needs change.
The Affordable ‘Non-Backup’ Powerwall 3
For many homeowners, the primary goal is saving money on bills, and the ‘whole-home backup’ feature is a nice-to-have, but not essential. Tesla now officially supports a Non-Backup configuration for Powerwall 3.
This configuration provides all the same bill-saving benefits – storing free solar energy and charging from cheap off-peak – but at a lower upfront cost. It achieves this by replacing the expensive Backup Gateway with a simpler Tesla Remote Meter.
Crucially, this system will not provide power during an outage. However, it makes the Powerwall 3 more accessible and can be upgraded to full backup functionality later if you change your mind.
YOUR PRIMARY GOAL | WE RECOMMEND | KEY COMPONENT |
Lowest Cost | Powerwall 3 (Non-Backup) | Tesla Remote Meter |
Bill Savings + Full Backup | Powerwall 3 (Backup) | Backup Gateway |
Future-Proof Scalability | Powerwall 3 + Expansion Pack(s) | Add-on Batteries |
How Much Does a Tesla Powerwall 3 Cost in Hampshire (2025)?
As Premium installers, we provide a fully-transparent, itemised quote. While the final price depends on your home’s wiring and the configuration you choose, here is an indicative breakdown.
A key factor in affordability is the 0% VAT on battery storage, a government incentive that saves you thousands.
- Tesla Powerwall 3 with Back-Up Capability: A typical installation, including hardware and labour, costs about £7,500.
- Tesla Powerwall 3 (non Back-Up): This comes out more cost-effective at around £6,850.
- Powerwall 3 expansion pack: A 13.5 kWh Expansion Pack is roughly £5,100, fully installed.
Breaking news! From 1 December 2025 until 31 March 2026, Tesla Energy is offering up to £750 off your Powerwall installation. You can find full details in our Tesla Powerwall Rebate guide.
For a detailed, fixed-price quote for your Hampshire home, please contact us for a free remote or on-site survey.
Ways to Save: Grants, Tariffs, and ROI
The Powerwall is a flexible asset that helps you save money and get more out of your solar panel system:
- Smart Export Guarantee (SEG): If you have solar, you can sell any excess electricity you export back to the grid, but the main idea is to capture as much of your surplus solar as possible in the battery.
- Smart tariffs: Powerwall 3 is designed to work perfectly with smart tariffs like Octopus Intelligent. The system will automatically charge the battery when electricity is cheapest (e.g. overnight) and power your home when rates are high, dramatically cutting your bills.
- ROI: Between solar self-consumption and smart tariff optimisation, most Hampshire homeowners see a significant reduction in their energy bills with battery storage, often by up to 90%.
Our 4-Step Tesla Powerwall Installation Process
We make the process straightforward and transparent:
STEP 1: Free Expert Survey
It starts with a conversation. Our Hampshire-based team will conduct a free, no-obligation remote or on-site survey to understand your energy goals and assess your home’s electrical setup.
We don’t do ‘one-size-fits-all’. Our experts design a system specifically for you, explaining the benefits of the Powerwall 3, Expansion Packs, or Non-Backup options. You’ll receive a clear, itemised proposal with no hidden costs.
Our in-house, Premium-certified installers will complete your installation, typically in a single day. We handle all the wiring and commissioning with meticulous care and professionalism.
We commission the system and connect it to your Wi-Fi. We won’t leave until we’ve shown you how to use the brilliant Tesla App to monitor your energy, control your system, and watch your savings grow.
Powerwall for Businesses in Hampshire
The Tesla Powerwall 3 isn’t just for homes. It’s a powerful tool for businesses in Hampshire, too.
By storing energy, a commercial Powerwall system can help businesses drastically reduce high peak-demand charges, maximise self-consumption from on-site solar, and ensure critical operations stay online during a power cut.
Contact our commercial team for a free site assessment and ROI calculation.
Frequently Asked Questions (FAQ)
No. While Powerwall 3 is a perfect partner for solar, it can be installed on its own. You can use it to charge from the grid on cheap off-peak tariffs and use that stored energy when grid prices are high, saving you significant money.
No. Powerwall 3 batteries are not compatible with Powerwall 2 systems. They can only be added to other Powerwall 3 batteries or Expansion Packs.
Yes. The Powerwall 3 is IP67 rated, meaning it is flood and dust resistant. It is designed to be safely installed in a suitable location either indoors or outdoors.
A typical, straightforward Powerwall installation is completed by our expert team in a single day.
The Backup Gateway is the ‘brain’ of a backup-enabled system. It controls the Powerwall and constantly monitors the grid. If it detects a power cut, it safely disconnects your home from the grid and switches your home to backup power from the battery. It’s not required for the new ‘Non-Backup’ configuration, which uses a Tesla Remote Meter instead.
Don’t settle for a standard ‘certified’ installer for your home.
As Hampshire’s Premium Tesla Powerwall 3 experts, Infinity Energy Services delivers a superior installation based on unparalleled technical knowledge.
Whether you need full whole-home backup , a future-proof system with Expansion Packs , or the new, affordable Non-Backup solution, our local team is ready to design the perfect system for you.
Contact our Hampshire office today on 0800 909 8882 to speak to one of our energy experts.
