After months of teasing its first venture beyond electric cars, Tesla has taken the wraps off its Powerwall home battery.

The Powerwall is a wall-mounted lithium-ion battery pack that can power a home during outages. It can also cut down on electricity costs by storing energy when rates are low, and discharging during high-cost peak hours. Owners of solar panels can use the Powerwall to store excess power, making it easier to get off the energy grid completely.

Tesla will sell the Powerwall to home installers in two sizes: The $3,000 model offers 7kWh, while the 10kWh version (which Tesla recommends for backup applications) will cost $3,500, both with a 10-year warranty. Homes that need more power can chain multiple packs together. Keep in mind those prices don’t include inverter or installation costs; unless you’re a trained electrician, you won’t be able to install a Powerwall yourself.

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