Tesla releases Powerwall 3 expansion units for more capacity at lower price

Each expansion unit adds another 13.5 kWh of storage capacity to the original installation with a maximum of three such units connected to a single Powerwall. Now available in the US, the new product comes at a lower cost and slashes installation time by roughly half to 22 minutes.
Tesla Powerwall 3
Tesla Powerwall 3 can be installed indoors or outdoors | Image: Tesla

Tesla has added a new product to its residential battery energy storage offering, making it possible for Powerwall 3 owners to expand their systems more affordably and effectively.

Just like Powerwall 3, the DC expansion unit has the energy capacity of 13.5 kWh. However, it does not integrate some expensive components, such as an inverter, which makes it $1,000 cheaper than a regular Powerwall 3. 

Powerwall 3 owners can add up to three expansion units to increase their system’s capacity. In such a setup, the original Powerwall 3 is responsible for power conversion, site control, and solar coupling.

In addition to lower cost, the new product allows homeowners to upgrade the capacity of their Powerwall 3 home storage systems in less time.

As seen in a video released on X, the ground-mounted, add-on system can be installed in as quickly as 22 minutes versus 45 minutes needed for a regular Powerwall 2 installation. The wall-mounted expansion unit would take 26 minutes to install.

Presently, the Powerwall 3 DC expansion unit is available only in the US.

Tesla launched the latest iteration of its Powerwall earlier this year, nearly a decade after launching Powerwall 1 in 2015 and Powerwall 2 in 2017. The product was first made available in the US, and was later rolled out in Canada, Germany, the UK, Australia, and New Zealand.

Unlike Powerwall 2, the new product features an integrated solar inverter. Powerwall 3 also boasts more than double the power output of Powerwall 2, with a maximum continuous output of 11.4 kW.

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  • Marija has years of experience in a news agency environment and writing for print and online publications. She took over as the editor of pv magazine Australia in 2018 and helped establish its online presence over a two-year period.

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