Hawaii Solar Blog

Tesla Energy Powerwall: Making Battery Storage Affordable

Tesla Energy Powerwall

On April 30, 2015 Tesla Motors, the automaker known for revolutionizing the electric car industry, announced its entrance into the solar battery business with two battery backup products that will be sold under a new product line called Tesla Energy.

Tesla CEO Elon Musk explained that we need to make a “fundamental transformation” in how energy is delivered across the earth. To help us do that, Tesla has developed the Powerwall, a wall-mounted home battery that uses electricity generated from your solar panels to provide power at night, act as battery backup during power outages, and even disconnect completely from the grid if you wish.

The Powerwall comes with a 10-year warranty and will be available in 10 kWh weekly cycle and 7 kWh daily cycle models. Multiple batteries may be installed together for homes that require more power, up to 90 kWh total for the 10 kWh battery and 63 kWh total for the 7 kWh battery.

Some advantages of Powerwall compared to other battery backup systems currently on the market include its size, style, and cost. Since the Powerwall is measures only 51″ x 33.8″ x 7″ and is made to be wall-mounted, any home has the space to have it installed in their garage or wall of their house instead of needing a designated battery room. The Powerwall is also available in different colors and “looks like a beautiful sculpture on the wall,” according to Musk. In addition, having energy security with the Powerwall won’t cost you an arm and a leg. Tesla’s price is $3,500 for the 10 kilowatt-hour model and $3,000 for the 7 kilowatt-hour version (without the inverter or installation costs).


Tesla’s selling price to installers is $3500 for 10kWh and $3000 for 7kWh. (Price excludes inverter and installation.) Deliveries begin in late Summer.
Powerwall specs:
· Mounting: Wall Mounted Indoor/Outdoor
· Inverter: Pairs with growing list of inverters
· Energy: 7kWh or 10kWh
· Continuous Power: 2kW
· Peak Power: 3kW
· Round Trip Efficiency: >92%
· Operating Temperature Range: -20C (-4F) to 43C (110F)
· Warranty: 10 years
· Dimensions: H: 1300mm W: 860mm D:180mm


While the Powerwall is constructed for residential use, Tesla created the Powerpack which is “designed to scale infinitely” for business and larger installations of gigawatt class or higher. These batteries could be used to power remote parts of the world, saving places that have no or intermittent electricity from having to build power lines, “similar to what happened with cell phones and landlines where cell phones leapfrogged landlines and there was no need to set them up in remote locations.”

It would take 160 million Powerpacks to get the U.S. off of fossil fuels, 900 million to convert the entire world, and two billion Powerpacks to transition all transportation, electricity generation, and heating to renewable energy. This may seem far-reaching to most, but Musk points out that this is something that has been done before as our world went from no automobiles to two billion cars and trucks on the roads.

“It’s something that we must do and that we can do and that we will do,” Musk said.

Deliveries for the Tesla Powerwall are expected to begin this summer. Stay tuned with Haleakala Solar as we keep track of this exciting new product.

tesla powerwall for home solar battery storageattaches on the wallMusk introduced the Tesla Energy Powerwall system

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