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• Two products: a battery with the capacity of 10 kWh (expandable to 90kWh by connecting several batteries together) and with the capacity of 7 kWh (expandable to 63 kWh).
• Deliveries begin in summer 2015


Tesla announcement is just another sign of the stationary battery market evolutions. According to Yole last report on “Energy management for smart grid, cities and building: opportunities for battery electricity storage solutions”, just released by YOLE, energy storage is playing a major role in the energy transition currently underway. Decentralization of electricity sources has become possible because of improving technologies and falling costs of intermittent renewable energy installations and energy storage solutions. Traditional business models based on centralized energy supply are becoming obsolete.
And EH/HEV batteries manufacturers will drive the stationary battery energy storage business. The growing electric vehicle/hybrid electric vehicle is a game changer driving battery performance improvement and cost decrease. Tesla (with BYD and few others) are perfectly positioned to take full benefit of both activities: having an EV/HEV car and linked battery activity will help to propose efficient stationary batteries at affordable price and the stationary batteries applications and sales will fill the Mega Factory under construction. Such evolutions are well described in the new YOLE report “Energy management for smart grid, cities and building: opportunities for battery electricity storage solutions”.
Tesla car and Tesla Powerwall
So now back to Tesla new products. Powerwall is a home battery that charges using electricity generated from solar panels, or when utility rates are low, and powers your home in the evening. It also fortifies your home against power outages by providing a backup electricity supply. Automated, compact and simple to install, Powerwall offers independence from the utility grid and the security of an emergency backup.
Power companies often charge a higher price for electricity during peak evening hours than overnight when demand is low. Powerwall can reduce your power bill by storing electricity when rates are low and powering your home when rates are high.

PTesla Powerwallowerwall automatically switches to battery power in the event of an electric company outage, bringing peace of mind to those who live in areas prone to storms or unreliable utility grids.

Powerwall comes in 10 kWh weekly cycle and 7 kWh daily cycle models. Both are guaranteed for ten years and are sufficient to power most homes during peak evening hours. Multiple batteries may be installed together for homes with greater energy need, up to 90 kWh total for the 10 kWh battery and 63 kWh total for the 7 kWh battery.

What is here surprising is the price proposed by Tesla for its batteries: this is very low, almost 10 years in advance compared to the forecasted price decrease from the battery industry. What could happen is that Tesla will certainly sell also services linked to its stationary batteries, coupled with its different interests in the photovoltaic industry. We will certainly see reactions from other EV/HEV car makers (like Toyota, BYD…), battery makers (Toshiba, Saft…) or inverter manufacturers, as all of them have some skin in the game. This is an interesting time for the industry!


Source: www.yole.fr  -  www.teslamotors.com/powerwall