Over Hill Sailing Club
Join Date: Feb 2009
Location: Adirondacks NY
Thanked 111 Times in 108 Posts
Rep Power: 9
Fuse size should be based on the maximum amp capacity of the equipment on the load side; usually based on wire size. The main terminal fuses are very good and have come down in price. I used ANL fuse blocks instead when I rewired the batteries a couple of years ago- three batteries: one start battery, fused alone at 300a, and two house batteries in parallel, ANL fused at 100 amps leading to a sub panel (rated at 100a)for house circuits. This little fuse block is located within the 7" limit and serves as the solar panel input/fuse point as well, wired to a bulkhead plug that is easy to access to plug/unplug panels as needed. I also installed a crossover charging relay. The individual house circuits for lighting, etc, are fused at wire ratings, usually 15 or 20a for #14 or #12 wire. (note:I understand that some bilge pumps have started fires before reaching designated fuse rating).All large 2/0 wires off the batteries meet the 7" spec. that the CG uses. Have not had any trouble blowing the 300a starter fuse. The ANL fuses have good "slo-blo" characteristics if you look at their graphs. It is amazing that more of the old boats did not go up in flames with the long, unfused main wires they used.
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
Last edited by smurphny; 02-24-2012 at 06:57 PM.