Tesla Powerwall 3 Expansion Pack – More Power, More Possibility

Powering Up Your Home, the Smart Way

Tesla’s latest innovation is here — the Tesla Powerwall 3 Expansion Pack. Already known for its sleek design and intelligent control, Powerwall 3 now offers a cost-effective and scalable solution for homeowners who want to increase their battery storage without installing a second full unit.

Whether you want to store more of your solar energy, prepare for power cuts, or reduce your electricity bills even further — the Expansion Pack makes it possible.

⚡ What Is the Powerwall 3 Expansion Pack?

The Expansion Pack is a DC-coupled battery module that connects directly to your Powerwall 3. It doesn’t have its own inverter — instead, it uses the existing Powerwall 3 infrastructure, which keeps the cost and complexity of installation lower.

Each Expansion Pack adds:

• 13.5 kWh of additional usable storage

• Seamless integration with your existing Powerwall 3

• Shared use of the existing inverter and control system

• Scalable storage up to 54 kWh per system

It’s ideal for homes that want more capacity without doubling up on equipment.

💰 Why Add an Expansion Pack?

If you already have Tesla Powerwall 3, the Expansion Pack is a logical next step. Here’s why:

✅ Cost-Effective Scaling

Adding an Expansion Pack is significantly more affordable than a second Powerwall. You get more storage without the need for extra hardware like another inverter or gateway.

✅ Faster Charging

A standard Powerwall 3 charges at around 5 kW. Add one Expansion Pack and that bumps up to 8 kW. With more solar or cheaper off-peak electricity available, the faster you can store it, the better.

✅ More Independence

More storage = less reliance on the grid. Store solar during the day or charge overnight on low-rate tariffs, then use that energy when rates are high or during outages.

🛠️ How It’s Installed

There are two main installation options depending on your available space and preferences:

1. Stacked Installation

• The Expansion Pack is mounted behind the existing Powerwall 3.

• Compact footprint, ideal for garages and utility rooms.

2. Side-by-Side Installation

• Both units are mounted on the wall next to each other.

• Easier to service and often quicker to install.

Flexible cabling allows positioning the Expansion Pack up to 4 metres away from the main unit, so even tight spaces can be made to work.

🌍 Designed for Smart Energy Homes

If you live in Cornwall or Devon, where solar energy potential is high, the Tesla Powerwall 3 Expansion Pack can help you make the most of your renewable generation. At GreenGenUK, we design systems around your property and your energy use, not just what fits in a box.

This means:

• Smarter use of off-peak electricity (like Octopus Go)

• Higher solar self-consumption

• Reduced exposure to rising energy prices

🔧 Ready to Upgrade?

We’ve already begun rolling out Expansion Pack upgrades for existing Powerwall 3 customers across Cornwall and Devon. Our team can guide you through:

• Confirming compatibility

• Designing the right storage capacity

• Installing and commissioning the new system

🟢 Why Choose GreenGenUK?

We’ve been installing renewable systems since 2011. Our in-house team are certified Tesla installers, and we don’t just stop at fitting batteries — we take care of everything from design to DNO approval.

Whether you’re expanding a current system or planning a new one, we’re here to help you store smarter and save more.

👉 Want to expand your Powerwall 3 system?
Contact GreenGenUK today to discuss your options.