Can't figure out what's going on with my onboard charger. Have a two bank. Needless to say the batteries were not charged. Here's the info from the XPS manual that you can use to check into your problem. All the newer 'smart' chargers are designed to be on as long as you are not using the boat. Library v Battery Charger Manuals. ProSport PFC — Universal AC Manual. ProSport Gen 3 CEC Manual. ProTournament Elite Manual. ProNauticP Manual CEC. ProNauticP Multi-Language Remote Instructions. Digital Mobile Charge Battery to Battery Manual. Digital Mobile Charge Alternator to Battery Manual. ProMite Manual. Alltech Series Chargers Manuals. ProTech-4 Owner's manual and Installation Guide.