Not unlike its Alliance partner - Nissan (with its xStorage solution), Renault and Powervault have now announced a partnership to offer home energy storage systems - consisting of used electric vehicle batteries;  of which Renault should have more than a few of, considering the current returns of thousands of expired 22 kWh battery leases from its popular ZOE offering  (with many switching to new 41 kWh packs going forward).

Renault and Powervault present a home stationary energy battery storage system based on second life electric vehicle batteries

Renault and Powervault present a home stationary energy battery storage system based on second life electric vehicle batteries

According to Renault, it's expected that the batteries will last 8-10 years in its EVs, and then a further 10 years of “second-life” in an energy storage solution (ESS)...take note of that future research analysts compiling "lifetime emission surveys" on EV and battery technologies.

Powervault currently demonstrates 2, 4 and 6 kWh lithium battery units (of unknown further specs) on its website.

"The batteries used in electric vehicles usually have a lifetime of 8 to 10 years. However, there is still plenty of useful life in these batteries for stationary applications; giving the batteries an additional life before they are recycled. 

Within a Powervault home battery system, Renault batteries are estimated to have up to 10 years of additional useful life. Second life battery packs are removed from the electric vehicles, unpacked and graded before Powervault make them into smaller battery packs for their application."

For Powervault, using EV batteries should reduce the cost of the battery unit (also still unknown) by 30%.

Renault ZOE Z.E. 40 battery

Renault ZOE Z.E. 40 battery

At first, Renault and Powervault and M&S Energy utility will launch a trial project in UK with 50 installations in homes with solar panels.

"Powervault is placing 50 trial units, powered by second life batteries provided by Renault, in the homes of customers who already have solar panels installed. The trial will explore the technical performance of second life batteries as well as customer reaction to home energy storage to help develop a roll-out strategy for the mass-market. The trial will be run with eligible customers of M&S Energy, plus social housing tenants and schools in the South East.

Powervault is an innovative home battery system, which enables homeowners to live smarter by increasing their ability to store and use the solar energy freely-generated from their own solar panels. Powervault units can also automatically charge using low cost, off-peak energy from the grid. The Powervault system sits at the heart of the smart home and the optimisation of energy usage within it. As well as reducing the cost of production of a Powervault, the use of second life batteries will also optimize the life-cycle of the Renault batteries before they are recycled."

"The Powervault second life trial will start in July 2017 and last 12 months. The 50 units in the trial will be divided between the homes of M&S Energy customers, plus Hyde residents, as well as social housing tenants and schools in the Royal Borough of Greenwich, via Solarcentury. M&S Energy will be contacting eligible customers to discuss their interest in participating in the trial."

By 2020 hopes to sell 30,000 energy storage systems, which would require around 15,000 used EV battery packs.

Renault and Powervault present a home stationary energy battery storage system based on second life electric vehicle batteries

Renault and Powervault present a home stationary energy battery storage system based on second life electric vehicle batteries

Joe Warren, Managing Director of Powervault, says:

“The collaboration we are announcing today with these two household name brands – Renault and M&S - is an important milestone on our journey towards achieving mainstream adoption of home energy storage. Homeowners and brands are now looking to benefit from the smart power revolution. It’s only a matter of time before a Powervault becomes as common in households as a dishwasher.”

Nicolas Schottey, Program Director, EV batteries and infrastructures at Renault, explains:

“Thanks to this home energy storage partnership with Powervault, Renault is adding a new element into its global strategy for second life batteries, which already covers a large number of usages from industrial to residential building and districts. The second life use not only gives additional life to electric vehicle batteries before they are recycled, but also allow consumers to save money. It’s a win-win-win: for EV owners, home-owners and the planet.”