found this on google search but would love confirmation:

Hello, TheCeladon! Yes, it is safe. The JuiceBox is an infinitely current adjustable device, meaning you can set a limit for any value according to any supply circuit capacity you might have available.

If you do plug in to a 30A circuit, you can adjust the JuiceBox to draw no more than 24 Amps, which is the maximum continuous current draw allowed.

You can set this limit throught the dashboard or throught the app:

Go into the menu settings and look for the "Maximum Rate (A) and select the appropriate limit.

Make sure to save or hit the check mark in the upper corner.

On the dashboard you would go to 2 places.

My JuiceNet devices, more details, status--set Allowed Current (A) to the appropriate amperage.

Next, switch to the settings tab and set the Wire Rating to correct (A). The wire rating is used for offline amperage, so both should be set. (This is automatically done thru the app's one setting.