UK technology start-up Powervault has launched the second-generation of its energy storage systems.

The systems will enable householders to access newly introduced smart tariffs by automatically storing energy when it is cheap for use at times of peak demand.

They will also offer an emergency power socket that operates required equipment during blackouts.

The systems have capacities between 2 kWh to 6 kWh with options for lead acid or lithium ion batteries.

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