I'm about to sign a deal with SolarCity for a 10kW PV system with 3 Powerwalls. I am hopeful this will enable solar self-consumption as well as provide backup power for my whole home. I have not found any information on how the Powerwalls get connected. Are the outputs combined together, or will certain circuits have to be moved to each powerwall in sub-panels? Also, I am concerned about possible noise from having three Powerwall units on an exterior bedroom wall. If I will be able to hear them at all indoors, then I will need to find a different installation location. Anyone know where to dig up information? I'm not sure if PW2 installations have even begun yet. Thanks.