Gateway offline no charging?
I had my gateway go offline. When it was done the powerwall stored no energy during the day. Is that normal? What would be different in a power outage where you lose internet connectivity?
Internet connectivity is not needed to get solar or charge the Powerwalls, but you may not get status on your phone if cell service is out. What do you mean the gateway went offline? I've never seen that happen myself.
You can look at the solar status on your local network. You have to find the WiFi IP address from your router, then enter it in a browser like http://192.168.1.120 (everyone's URL will be different numbers).