From ESS News
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 an energy capacity of 13.5 kWh. However, it does not integrate some expensive components, such as an inverter, which makes it about $1,500 (USD 1,000) cheaper in the United States 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.
Presently, the Powerwall 3 DC expansion unit is available only in the U.S..
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