Tesla’s affordable and simple energy storage

Lance Turner takes a look at the new Tesla Powerwall, due in Australia by 2016.

Tesla Motors have turned their lithium battery expertise to domestic and commercial energy storage systems.

The domestic scale system is called the Tesla Powerwall, and it comes in two variants—a 7 kWh “daily cycling” unit designed for load shifting on a daily basis and a 10 kWh “weekly cycling” unit for grid power backup.

Both units look the same and include battery bank, liquid thermal control system and charge control system all housed in a stylish wall-mounted outdoor-rated cabinet measuring 1300 x 860 x 180 mm and weighing around 100 kg. The operating temperature range is -20°C to 43°C.

Battery output voltage ranges between 350 and 450 volts, so they will be compatible with the majority of grid-interactive inverters already on the market. The rated output power is 2 kW continuous and 3.3 kW peak, with a 92% round-trip DC efficiency.

The Powerwall units are also stackable, so if you need more storage capacity of maximum power capacity you just link two or more together. They are single phase and three phase utility grid compatible and come with a 10 year warranty, with an optional ten year extension.

RRP: Australian pricing is TBA. The Powerwall is expected to become available here later this year or early next. Current US pricing is $3,500 for the 10 kWh unit and $3,000 for the 7kWh model. For more information see www.teslamotors.com/powerwall

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