http://www.ebay.com/itm/ProMariner-ProTech-12vt-20-Amp-3-BANK-Boat-Marine-Battery-Charger-Maintainer-/151186903725?pt=Boat_Parts_Accessories_Gear&vxp=mtr&hash=item23337112ad
This model would be more than enough. I also have a 20 watt solar panel with a Morningstar PWN controller that do well when I am off shorepower or don't feel like stringing the cord up. Joe Della Barba Coquina
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