I’ve pasted what the document says below. It will stop when the battery is “full”. With the MINxxxxTL-XH-US inverter and a ARO battery connected, you have a setting to tell the inverter what percentage “full” is. You can’t set it higher than 100%. I’d assume the new SPH-US has a percentage setting or battery voltage setting or both that identifies “full”. I’m also assuming that the type of setting (voltage or %) would depend on what battery you connect and what the battery communication interface offers for you to use.
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4.3 Typical Battery Charge First Mode
Priority of Energy Sources = PV > Grid
Priority of Energy Usage = Battery > Load > Grid
PV power will be used to charge the Battery as the top priority. After the Battery is fully charged, excess PV power available will power the home loads. If excess PV power is insufficient to power the home loads, the Grid power will be used to cover any shortage.