I appreciate the advice, but it's (probably) a more complicated issue than you think it is, and this has been a well-traveled and well-understood, yet frustrating, path for a number of Powerwall owners. It has to do with the AC line frequency and interactions between the Powerwalls, solar inverter, and commonly-available UPSs. Rather than try to explain it (which I probably would do poorly), I'm just going to point to the thread in the Tesla Energy forum where this has been discussed at length. Powerwall 2 + UPS Connundrum - and solution I owe that thread an update on some things I learned over the past few days. Thanks, Bruce.