Voltage drop is a significant issue in marine electric equipment.  The American Boat and Yacht Council (ABYC) offers the following charts to determine appropriate wire sizes based on the amp load and run length of wire in a given application.  To view charts for 3% and 10% voltage drop (for 12V and 24VDC systems), click on the image below.

ABYC recommends using wire based on the 3% chart for “sensitive” equipment (e.g. electronics, ballasted lights).  For most Imtra products (windlasses, basic lighting, windshield wipers), wire selected using the 10% drop chart is sufficient.  For all products, consult the owner’s manual for specific wiring instructions and/or size recommendations.