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Custom Marine Products provides most electrical components needed to install a complete solar system including PWM controllers and MPPT controllers listed on other pages.
Note: we carry wire with MC4 connectors already installed in 50 foot and 60 foot sections.
Complete marine solar system wiring diagram
Complete Solar System
#10 (or #8) AWG Marine Grade PV Wire
​#10 (or #8) AWG Marine Grade PV Wire
​MC4 Solar Line Connectors
​MC4 Solar Line Connectors
MC4 T-branch Connectors 2 to 1
MC4 T-branch Connectors 3 to 1
MC4 T-branch Connectors

​#10 (#8 too, call us) AWG Marine Grade PV Wire

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​#10 AWG Marine Grade PV Wire on a spool
​The proper wire from the solar panels to the controller and the controller to the batteries is important to minimize voltage drop and thus obtain maximum performance from your solar panel.  Our wire is made for the marine environment and will provide optimal power throughput with minimal voltage drop.  We install MC4 connectors on the wire so no special tools will be required for installation.

50 Foot Coil #10 AWG Marine Grade PV Solar Wire w- MC4 Preinstalled

This 50 foot coil has a male MC4 connector preinstalled on one end and a female MC4 connector on the other. Cut the coil in half for two 25 foot runs from the solar array to the controller. Extra wire can be used to run from the controller to the battery bank.
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60 Foot Coil #10 AWG Marine Grade PV Solar Wire w- MC4 Preinstalled

This 60 foot coil has a male MC4 connector preinstalled on one end and a female MC4 connector on the other. Cut the coil in half for two 30 foot runs from the solar array to the controller. Extra wire can be used to run from the controller to the battery bank.

Conductor: Stranded Tinned Copper (84 Strands)
Insulation: Halogen free cross linked polyolefin
Sheath: Halogen free cross linked polyolefin
Wire Diameter: .25 inches with sheath (6mm)
Wire is single conductor
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​MC4 Solar Line Connectors

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Our solar panels are factory wired with one meter long pigtails and waterproof  MC4 solar connectors.  Thus, you will need a pair of connectors to connect the wire to the solar panel.  Upon request, we will install the connectors to the wire ordered so no tools will be required.

MC4 Compatible Line Connectors

One male and one female connector for standard solar wire.  Can be pre-installed on the wire ordered upon request.

Price per pair
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MC4 T-branch Connectors

MC4 T-branch connectors are used to wire multiple panels in parallel.  We offer 2-1, 3-1 and 4-1 T-branch connectors.  With these waterproof connectors, it is easy to plug the panels together with no special wiring, junction boxes or tools. 

​MC4 Compatible 2-1 T-branch Connector Set

Used when connecting two solar panels to a controller
Rated voltage: DC 1000V
Waterproof grade: IP 65            
Cable standard: 2.5/4/6mm²    
Temperature range:-40℃~+85℃
Flame retardant grade: UL94-V0​
Composite contact material: Copper, Tin Plated
Price per pair
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MC4 Compatible 3-1 T-branch Connector Set

Used when connecting three solar panels to a controller
Rated voltage: DC 1000V
Waterproof grade: IP 65             
Cable standard: 2.5/4/6mm²      
Temperature range:-40℃~+85℃
Flame retardant grade: UL94-V0
Composite contact material: Copper, Tin Plated
Price per pair
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MC4 Compatible 4-1 T-branch Connector Set

Used when connecting three solar panels to a controller
Rated voltage: DC 1000V
Waterproof grade: IP 65             
Cable standard: 2.5/4/6mm²      
Temperature range:-40℃~+85℃
Flame retardant grade: UL94-V0
Composite contact material: Copper, Tin Plated
Price per pair
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  • Home
  • Marine Solar Panels
    • All Marine Solar Panels
    • Flexible Marine Solar Panels >
      • Flexible Panel Specifications
      • Flexible Panel Bimini Solar System Kits
      • Flexible Solar Panel Mounting Kits
    • Semi-Rigid Walk On Marine Solar Panels >
      • Semi-Rigid Panel Specifications
      • Semi-rigid Solar System Kits
      • Semi-rigid Panel Mounting System
    • Rigid Marine Solar Panels >
      • Rigid Panel Specifications
      • Rigid Solar System Kits
      • Mounting System - Top Of Pole
    • Van Solar Panels
    • Stern Rail Mounted Solar Panels
    • Discounted Solar Panels
    • Portable Solar Panels
    • Shop Our Store
  • Products
    • Marine Solar Panels
    • Lithium Batteries >
      • LiFePO4 Lithium Batteries
      • Portable Power Stations
    • Solar Controllers >
      • Victron MPPT Controllers
      • EP Solar Controllers >
        • DuoRacer Dual Output Series
        • Xtra-N Series
        • MPPT Tracer Series
        • PWM Duo Dual Output Controller
    • Accessories >
      • Wire & MC4 Connectors
      • Outboard Motor Lifting Crane >
        • Lift Crane Features and Specs
      • Solar Water Heating System For Boats
    • Victron Products >
      • Victron MPPT Controllers
      • Victron Electrical Components
      • Inverters
      • Victron Batteries
    • Shop Our Store
  • Reviews
    • Reviews
    • Gallery of Installations
  • Handy Info
    • Learn About Solar
    • System Design
    • Solar System Installation Pointers
    • Manuals & Information
  • Support
    • FAQ
    • Troubleshooting
    • Contact Us
    • Solar System Installers
    • Battery Exchange Plus
    • Handy Products We Don't Carry
    • Freight Forwarders for International Shipping
    • About us
    • Call (248)453-2433
    • Return Policy
    • Shipping Rates
  • Blog