I have a 4 kWh system with 1 Powerwall 2. I also have a UPS: CyberPower LX1100G, which powers my computer, the cable modem, and router.
Last night (10:00 PM) I had a power outage and UPS kept on beeping (for an hour) until it died. While beeping it showed 60Hz on its display.
At the time of...