Does anyone here know what you would have to do to install Powerwall 2 in a grid-tie solar system and also use it for the disaster backup scenario? I understand that Powerwall 2 has an included inverter, but that is used to convert the DC output of the batteries to AC. The input to charging the batteries is AC, so that power will come from the existing inverter(s) in the solar array. In my grid-tie system, the SunPower inverters convert DC from the panels to AC only when they sense the presence of AC power from the grid. This protects the utility company lineman from getting zapped by a distributed power generation source he doesn't know about. This works fine in the load-shifting case because the grid is functioning. But in the disaster case the grid is down and therefore my existing inverters won't allow the solar panels to charge the Powerwall. My assumption is that I will have to change out one or more inverters to more complex ones that protect the grid but also allow the charging of the Powerwall. Can anyone refer me to specific products that provide this function?