I know a lot of folks keep their boat plugged-in 24-7….not me!Prefer to plug my charger into a $10 outlet timer and schedule it to turn on twice a week for a couple of hours in the evening when Im home.Call me paranoid, but anything mechanical / electrical can FAIL, and I dont want to come home to see fire trucks hosing my garage down.If you have wet-cell batteries, check the water level often, esp in the summer (hot) months.Too often Ive checked my batteries and found five cells fine, with the sixth cell needing several ounces of water. AGM batteries will certainly minimize maintenance requirements, but wont necessarily keep a charger from burning up.My .02