[23/12/2016] A new installation of a Tesla Powerwall as a retrofit of a roof-top based 3 kWp solar array went online recently in Northern Italy. The Powerwall battery is operated by a SMA SBS 2.5 . The energy flows from/to the battery are visualized from the SMA Sunny Portal. A 100Mbs is required to collect the data-wires from the energy meter and the household panel. The installation is pretty standard and clean, with the Powerwall wall-mounted beside the SBS. You may find more information about a typical Powerwall set-up from a very similar installation here [in Italian].