sloooow charger

so I drove 46 miles yesterday. Several trips throughout the day, mostly 35ish mph, some freeway. I plugged in last night, it was not charged yet this morning when I went to take the kids to school! It was probably close to 12 hours on the charger at 5.8a... guess I need to plug in earlier (or get a bigger charger...). Bummer since the charger screws with my radio reception in the house.