I spent last winter on the hook down in the Florida Keys and was also away from my boat for extended periods. I purchased an inexpensive 85 watt solar panel with controller and hooked it up. When I'd leave the boat, I turned off all non-essential DC items...including the refrigerator...leaving on only my bilge pumps. That little portable solar panel kept my batteries topped just fine. Because it was portable, I simply lashed it atop my fly bridge cover when I left, and removed it when I returned. Cheap, simple, works fine so long as the sun shines. Good Luck Mate!
|