I recently did service up grade on old house that had outside pannel with 1 100amp breaker to protect sub pannel inside house. We changed outside pannel to 200amp and added 2 branch circuts one for water heater and one for dryer. Inside pannel is full and pretty well loaded.Do I need to use 80amp breaker on #2serAL to sub pannel or could it stay at 100amp as existing.