Operating Temperature
Both the Powerwall 2 and Powerwall 3 can operate in temperatures ranging from -20°C to 50°C. However, the Powerwall 2 is liquid-cooled, which helps it maintain an optimal operating temperature more efficiently.
The Powerwall 3, on the other hand, is air-cooled, which means it relies on fans to regulate its temperature. While this design choice has allowed Tesla to reduce costs, it does mean that the Powerwall 3 will generate some noise when the fans are running at full speed.
Weight and Size
The Powerwall 3 is heavier than the Powerwall 2, weighing in at 130 kg compared to the 114 kg of the Powerwall 2.
In terms of size, the Powerwall 3 measures 1099 mm x 609 mm x 193 mm, compared to the Powerwall 2’s dimensions of 1150 mm x 753 mm x 147 mm. While the Powerwall 3 is deeper/thicker, it’s also narrower and shorter, which makes it easier to fit into tight spaces.
Because the Powerwall 3 is heavier, it’s important to note that Tesla have also redesigned the mounting bracket and added levelling feet, so you’ll always get a perfect finish to your installation.
Safer Chemistry
The Powerwall 3 uses a lithium iron phosphate (LFP) battery chemistry, which is cobalt-free. This is an upgrade from the lithium-ion NMC (Nickel-Manganese-Cobalt) chemistry used in the Powerwall 2.
LFP batteries are generally considered safer and more environmentally friendly because they are less prone to overheating and do not contain cobalt. Cobalt is a controversial and expensive material to mine; often associated with unethical mining practices.
Installation Considerations
Both versions of the Powerwall can be wall-mounted or floor-mounted, and the choice between the two will depend on the structure of your home and available space. Wall mounting requires a sturdy wall that can support the weight of the unit, while floor mounting might be a better option for some situations.
Integrated Solar Inverter: The Powerwall 3 comes with an 11.04 kW built-in hybrid inverter, reducing the need for a separate central inverter. This means it’s one less component to invest in if you want a system with DC architecture.
Working with Solar Panels: The Powerwall 3 supports up to 20kW of solar panels, allowing for significant energy production and storage. It’s a system with DC architecture, so the solar directly feeds the battery allowing for greater charging efficiency of 97.5%.
Power Output: With a continuous power output of 11.04kW the Powerwall 3 meets the demands of larger households and energy-intensive appliances.
Scalable Storage: Currently, the Powerwall 3 can stack up to four units together for 54kWh total. Tesla has announced that in the first quarter of 2025, they’ll release battery units without a hybrid inverter inside. These “dumb” battery units can be stacked up to 16 units or 216kWh. This battery’s expandability is perfect for those with growing energy needs or who plan to add an electric vehicle.
Charge On Solar: The ability to bypass the grid and directly charge your electric vehicle from your solar system is a standout feature. This not only reduces your reliance on the grid but also takes advantage of your solar energy, even during outages.
Safety: The Powerwall 3’s lithium iron phosphate (LFP) chemistry is safer than the lithium-ion NMC chemistry used in the Powerwall 2. This reduces the risk of overheating, providing peace of mind for homeowners.