This is a product targeting markets with solar FITs.
Company Press Release:
Tenesol's PV energy storage system goes on sale12. September 2011 | By: Tenesol
Tenesol has launched its PV energy conversion and storage solution. The Sun Smart+ system is the result of a four year project and is available to buy in certain international markets.
...In 2008, Tenesol, together with several leading associations from France and Germany, set out to create a new technology in energy storage for grid connected PV systems. The solution provides energy conversion and system management. Its functions include multidirectional energy flows, self-consumption, grid support and back-up.
Following one of the largest field tests ever undertaken in Europe, the €9 million project has now delivered a working system that can be mass produced.
The solution can be retrofitted to residential and small commercial systems. It can accommodate PV energy production of up to 5 kWp for more than 20 years. The system uses lithium-ion batteries rated from eight to 13 kWh with a nominal voltage of 190 V to 290 V. The batteries are compact and highly energy efficient, and in a recent two year field test reached an impressive 97 percent efficiency.
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http://www.pv-magazine.com/services/press-releases/details/beitrag/tenesols-pv-energy-storage-system-goes-on-sale_100004302/I was taken with the stats on the lithium ion batteries: 20 year life and 97% efficiency.