My icebox beefup
Ron, Steve...What I did to my icebox seemed to help significantly, and it was easy and extremely inexpensive.The counter top opening to the icebox has two different sized rectangular openings, 1) the opening that the icebox lid sets IN, and 2) the rectangular opening that forms a frame for the lid to set ON (and not fall in). I cut a piece of 3/4" styrofoam to the size of the smaller opening, then taped the styrofoam (continuous strip around its perimeter) with duct tape to the bottom of the lid. This created an insulation to the bottom of the lid, and the tape acts as an air seal around the smaller rectangular opening. I then ran another continuous length of duct tape around the perimeter of the lid, creating another air seal at the larger rectangular opening. The correct taping process should cause the lid to have a snug fit when inserting it into the counter opening. The result is a double sealed insulated lid. It worked! The coldness was leaking out of the icebox through the lid and (absense of) the lid seal. This theory was consistent with an article I read in Sail magazine about icebox inefficiencies and common problems.Our ICE method is... two blocks of ice on bottom, fill in cracks with a few cubes, then food and cubes go on top. We may supplement with a bag of cubes as needed every other day (we don't use the shelf, food goes into tupperware containers). The blocks last about a week. More recently, we freeze milk jugs through the week at the house, and cut them apart for the free ice blocks on the weekends.Additionally, it helps to go into the icebox as infrequently as possible. When going in for food, get all you need first time, rather than repeatedly opening the icebox and letting the cold out.We bought our used `83 H31 last year, so I don't know for sure, but there are no external signs of previous owners having beefed up the insulation. The trouble with ours was in the lid area until we beefed it up! This may not work as a solution to your individual boat, but... it's an idea for you to consider! Okay, now I'll shut up and get off my soap box (icebox?)Steve, could you describe your battery / electrical / charging system that you use for refrigeration?