I have a Hylas 44 Mark I. I currently has a 1500 watt inverter/charger. The charging unit has malfunctioned and is now overcharging at 16 volts. This fried my two AGM 8d batteries. I clearly need to replace the unit. My question is what inverter/charge are you guys using, or recommending as a replacement. Note my boat doesn't have a micro, or washing machine. Only 110 volt equipment is a couple of laptops, charging the camera batteries, tv and dvd player and running a small shop vac. How big of a inverter charger do I need?