I built battery
boxes of 3/8" Starboard. They're held together by a mess of 2" SS oval head
countersunk screws. Starboard was easy to cut, round edges with a router, and drill, using jigs for drill positioning. Batts are a pair of G34 AGMs for starting, and a pair of g31 AGMs for house. The main battery
switch is inside the box holding the starting bank, accessible via a round Bomar
plate. Batts are held motionless by pieces of wood (could have been starboard) screwed into the wall and floor of the boxes. The Starboard was fairly expensive, but the boxes are strong, and quite satisfactory for our needs.
Since we cruise
mostly the PNW, I haven't paid much attention to extra ventilation to keep batts cool, but the temp sensor reports no worrisome temps. Since the boxes are out in the cockpit
, I was more concerned about keeping the batts clean and dry. They do that, even though they're exposed to plenty of rain, and salt water
from the wash-down hose (they're often splattered with fish
blood). 14 years old by now, and zero deterioration.