"Minimal charge means that your car will charge to the minimal charge value before it begins it's regular charging schedule."It also has a "minimum charge" setting but I've never been able to figure out what that does. Perhaps it provides a trickle-like charge that will keep the thermal management system operating?
So say you pull up to your EVSE in the early afternoon and you have 15% SOC or an estimated 11.5 kWh in the battery pack. You also have time of use schedule in play. It charges automatically from 12:00 AM - 7:00 AM. You also have minimal charge set to 23 kWh (about 30% SOC). You pull out your JuiceBox app and you set the current SOC in the app to that value. You then go and plug in and because you set the SOC it sees that you are below the current minimal charge and will meter out about 11.5 kWh. Enough to get you above the 20% SOC range to keep the battery healthy and maybe enough to be safe if you were to have to run out for something. Once it puts that amount in, it will turn off and wait for the normal time of use schedule to activate to provide power to whatever values you set or the car stops requesting for power.