My Powerwall was installed yesterday. It came with 18% charge and today my 12 years old 5kW pv system charged it to 98% in backup mode. I live in the SF bay area and lately with the long power outages by our terrible utility company PG&E it will be nice to leave it in the fully charged state for the next black out but I wonder if that would be bad for the battery pack. For my Tesla car it is advised to not leave the car charged at 100% for a prolonged time. Secondly my app will not let me lower the battery reserve. I guess I'll call Tesla for help regarding that issue. Any ideas will be appreciated. Thank you.