Is Powerwall 3 compatible with Powerwall 2?
Tesla has launched Powerwall 3, their latest home battery storage system, which features a higher power output and integrated solar inverter. While it still offers 13.5kWh of storage, just like Powerwall 2, there are some key differences that impact compatibility.
Key Differences Between Powerwall 3 and Powerwall 2
- Integrated Inverter: Powerwall 3 combines a DC inverter and battery in one, allowing it to accept up to 20kW of solar panels. In contrast, Powerwall 2 is AC-coupled and requires a separate inverter.
- Power Output: Powerwall 3 offers a continuous output of 5kW, 10kW, or 11.5kW,(1) depending on configuration, whereas Powerwall 2 provides a fixed 5kW output. Continuous output refers to how much power the battery can deliver at any given time.
- Battery Efficiency: Powerwall 3 has a slightly lower round-trip efficiency (89%) compared to Powerwall 2 (90%), meaning slightly more energy is lost when charging and discharging.
Given these differences, if you already own a Powerwall 2, you might be wondering if you can add Powerwall 3 to expand your energy storage capacity. Let’s explore why this isn’t possible.
Why Can't Powerwall 3 Be Added to Powerwall 2?
Unfortunately, Powerwall 2 and Powerwall 3 cannot be installed together due to three main reasons:
- Different Electrical Configurations: Powerwall 2 is an AC-coupled battery, meaning it works with an external inverter. Powerwall 3, however, has a built-in DC inverter, allowing it to connect directly to solar panels. This fundamental difference prevents them from working together.
- Incompatible Software & Firmware: Each Powerwall model runs on a different firmware and software system, making integration infeasible.
- Battery Technology: Powerwall 3 uses Lithium Iron Phosphate (LFP) whereas Powerwall 2 relies on Lithium-ion technology. LFP batteries are cobalt-free, making them less likely to overheat.
What If You Already Own Powerwall 2?
If you want to expand your energy storage, the best option is to add another Powerwall 2 unit while they are still available. However, Tesla has announced plans to phase out Powerwall 2, and stock may only last until early-to-mid 2025.
Your local Solahart Dealer can help determine if adding another Powerwall 2 is the right choice by:
- Assessing your current energy usage: Do you regularly use all the stored energy from your Powerwall 2? Would extra capacity help reduce reliance on the grid? Do you live in an area prone to blackouts?
- Considering your future energy needs: Will your energy consumption grow in the coming years? If you plan to get an electric vehicle or expand your household, adding extra storage now could be a smart investment..
Also read: Should I install a solar battery? Six factors to consider
If you require more energy storage capacity and Powerwall 2 is no longer available, you will need to replace your existing units with Powerwall 3, which may be a more expensive option in the long run. Hence, it would be more cost-effective to assess your needs now and add more Powerwall 2 units as soon as possible.
Plan Ahead – Act Now
If you are considering expanding your battery storage, now is the best time to act while Powerwall 2 is still available.
Contact Solahart today at 1300 721 984 or enter your details below to book a free in-home assessment.