Renault is partnering with the UK’s Powervault to give a second life to its electric vehicle batteries for solar energy storage.

Fifty trial units will be placed in UK homes powered by solar panels with second-life batteries from used Renault EVs. The idea is that if the trial run works, Powervault’s smart battery system costs could be reduced by 30 percent, taking its technology to mass-market rollout in the UK.

Renault batteries used in the Zoe and other electric models have a lifetime of eight-to-10 years, but there is still useful life remaining for stationary applications. The EV batteries can provide additional life, such as energy storage, before being recycled.

The companies are estimating these lithium-ion batteries will have another 10 years of additional useful life after being taken out of the vehicle. Once removed, the batteries are unpacked and graded before Powervault can convert them into smaller battery packs for their home solar application.

Powervault’s intelligent home battery system gives users the ability to store and manage solar energy to make consumption more efficient. The study with Renault will look at technical performance of the batteries, and customer reaction to the product to facilitate mass-market rollout.

Renault says the service will add to what the French automaker has already been doing with its used EV batteries.

“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,” said Nicolas Schottey, program director, EV batteries and infrastructures at Renault. “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.”

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Mercedes-Benz has been like-minded with Renault about the potential for solar energy storage in the UK and elsewhere. Mercedes-Benz Energy started doing business last month in the UK, offering home and business owners options for energy storage packages.

Another move was made in May when Mercedes-Benz Energy created a partnership with U.S.-based Vivint Solar. Homeowners who purchase the energy storage system will get modular 2.5 kWh batteries that can be combined to go as high as 20 kWh of stored power.

Vivint Solar will be on hand at the installation to customize homeowners’ setup based on their energy consumption.