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There is a really long UPS thread from a while ago, and what I am hoping for in this one is to get a listing of UPS models that work seamlessly with Powerwalls. I have an APC Back-UPS NS 650M1 that goes into battery mode whenever the grid goes out and Powerwalls kick in even though we had Tesla lower the frequency to 63Hz (verified with Kill-a-Watt at <=62.9) and the Back-UPS is rated for 50/60 Hz + – 3. So, what UPS do you have working with Powerwalls set to 63 Hz and not going into battery mode when grid goes out?