18 Gauge Marine Wire 18/2 Duplex - Waterproof Tinned Copper (100FT)

In this review the CONEPY 18 gauge marine wire is evaluated for boaters, RV owners, and anyone needing a durable, flexible 18/2 cable for low-voltage systems. The bottom line: this 100ft spool delivers dependable conductivity and corrosion resistance thanks to oxygen-free tinned copper strands and a thick PVC jacket, making it an excellent pick when long-term exposure to saltwater, sun, and vibration is a concern.

Key Features

• Oxygen-free tinned copper: The tinned copper strands improve conductivity and resist corrosion for longer life in marine or marine-adjacent environments.
• Thick PVC jacket: A superior PVC insulation layer protects against abrasion, UV, saltwater and high temperatures while remaining flexible for routing in tight spaces.
• Right gauge construction: Each conductor meets 18 AWG spec with 26 strands of 0.2 mm core and a 0.81 mm2 cross-sectional area to ensure efficient power transmission.
• High ratings: With IP68 waterproofing and VW-1 flame retardant rating, the cable is built for demanding installations and enhanced safety.
• Wide voltage compatibility: Rated to 600V and suitable for 5V, 12V and 24V systems, the wire works across common boat, automotive, RV and lighting applications.

Who It's For

This wire is aimed at boat owners wiring LED lighting, trolling motor feeders, or auxiliary circuits, as well as RV and automotive enthusiasts running stereo, lighting, or solar connections who need corrosion resistance and flexibility. Installers who value a thick jacket and tinned strands for longevity in wet or salty conditions will appreciate it.

Those who need ultra-high current capacity or heavier gauge runs for long-distance primary power feeds should look for a larger AWG size; this 18/2 cable is best used for low- to moderate-current circuits, lighting, sensors and accessories rather than main battery cables.

Pros & Cons

Pros

• Durable tinned copper construction offers better conductivity and corrosion resistance than aluminum alternatives.
• Thick PVC sheathing resists abrasion, UV and saltwater while staying flexible for routing under decks and through chases.
• Meets UL 1426, SAE and ABYC standards and carries useful ratings like IP68 and VW-1 for safety and waterproofing.

Cons

• As an 18 AWG conductor, it is not intended for high-current main battery runs or long-distance primary power delivery.

Specifications

Conductor	18 AWG, 26 strands of 0.2 mm oxygen-free tinned copper
Cross-sectional area	0.81 mm2 per conductor
Length	100 ft
Insulation	Thick PVC jacket, UV and abrasion resistant
Ratings	IP68 waterproof, VW-1 flame retardant, UL 1426, SAE, ABYC
Voltage	Rated to 600V; compatible with 5V, 12V, 24V applications
Operating temperature	-40F to 221F

Our Verdict

The CONEPY 18/2 18 gauge marine wire is a solid value for anyone needing a flexible, corrosion-resistant cable for lighting, accessories, and low- to moderate-current marine or vehicle circuits. It pairs tinned copper strands and a heavy PVC jacket to resist saltwater, abrasion and heat, making it a reliable choice for long-term installations where durability matters.

Frequently Asked Questions

Is this cable suitable for outdoor marine use?
The PVC jacket and tinned copper strands are designed for saltwater and UV exposure, and the cable carries an IP68 waterproof rating for wet conditions.

Can I use this wire for 12V LED strips and accessories?
Yes, it is compatible with 5V, 12V and 24V systems and is well suited for LED strips, lighting circuits and accessory power runs.

Is this wire good for main battery cables?
No, 18 AWG is not appropriate for main battery or high-current long-run applications; choose a heavier gauge for primary battery connections.