JuiceBox 8.6 kWh Storage
The US company JuiceBoxSolar brought a 8.6 kWh energy storage system to the market, specifically designed to support a domestic solar system. This kind of storage provides for the missing link between electricity production during the day and electricity consumption at night, when people return home from work. The system is advertised as maintenance free for a minimum of ten years and can be installed outdoors, against a wall.
Editor: the price is still a mystery and for that reason probably high.