4 picks with specs, filters and a calculator to find the right size.
Use marine-grade tinned copper on boats. Pick the gauge with our calculators, since it depends on both the current and the length of the run.
The standard boat wire for fish finders, lights, pumps and other small circuits. Tinned strands resist the corrosion that ruins bare copper on the water.
Best for: Electronics and accessory circuits.
Check price on Amazon (paid link) Specs from defender.comVery flexible tinned battery cable for trolling motors, inverters and main battery runs. It resists salt water, battery acid, oil and UV.
Best for: Trolling motor and inverter runs.
Check price on Amazon (paid link) Specs from defender.comA positive and negative pair in one jacket, so a fish finder or light runs as a single cable. Yellow is the ABYC color for DC negative.
Best for: Fish finders, lights and pumps.
Check price on Amazon (paid link) Specs from fisheriessupply.comInexpensive, flexible cable that’s popular for solar and inverter wiring in dry spots like a truck bed or camper. On a boat, choose tinned cable instead.
Best for: Dry installs on a budget.
Check price on Amazon (paid link) Specs from solacity.comNo products match those filters. Try clearing one.
Pictures are our own illustrations, not photos of the actual products. Specs come from the manufacturer or retailer listing linked on each card and were checked in October 2026. Models and prices change, so confirm details on the listing before you buy. As an Amazon Associate I earn from qualifying purchases.