I have not seen this question addressed by Tesla or mentioned in any article I have read about the Powerwall: Can a 7kWh and a 10kWh Powerwall be used together in a single installation? On a single inverter? Does the Powerwall BMS support them being used together? I assume the answer is "yes" but I have not seen any statement from Tesla to that effect, and right now the positive response to the new products is so overwhelming, and it is months in advance of products actually being available, that I cannot get an answer fromTesla. If the answer is "yes" that would allow a residence to have a battery backup for occasional use and a battery for daily cycling so the residence could be off grid. Note: for those who are not aware of the details of the two Powerwall products and think one is simply a larger version (and I realize that many TMC members do understand the differences), see Powerwall | Tesla Home Battery -------------- Models 10 kWh $3,500 For backup applications 7 kWh $3,000 For daily cycle applications ------------------- The two products use different battery chemistries, have different guarantees in terms of the number of charge cycles they are rated for, and are for different applications. One is not simply a higher capacity version of the other.