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How to Know What Size Fuses to Use on Your Solar System

4/14/2021

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The fuse between the battery bank and the controller is an ABYC wiring standard requirement.  Everything between the battery bank and an appliance must be fused to meet the standard and pass boat inspection. 

​To determine the size of the fuse needed for the solar system, do the following calculation: Watts of solar /12V (or 24V) = amps + 10 amps.  For example: 240W solar / 12V = 20 amps +10 amps = 30 amp fuse.  Also, many controllers have a built in fuse as a secondary protection.  The protection is against a short circuit overheating the wires to cause a fire.  There is no reason for a fuse between the solar panels and the controller although many customers use a circuit breaker there for the switch.  To calculate the capacity of the switch:  Watts of solar / Voc (open circuit voltage) = amps  For example:  240W solar / 30V = 8 amps.  Note the much lower amperage on the solar side of the controller vs the battery side of the controller in the examples above.  That's MPPT.  Panels never surge power unless hit by lightning.
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    Thomas Trimmer has been cruising with his Ericson 38 sailboat on the Great Lakes for over 20 years.  He has pioneered the use of solar energy for wilderness cruising.  He is continually designing and building equipment to simplify and enhance the cruising experience.

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Link To Our Article On How To Size Your Solar Panels For Your Boat
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  • Home
  • Marine Solar Panels
    • Semi-Flexible Marine Solar Panels
    • Semi-Rigid Walk On Marine Solar Panels
    • Rigid Marine Solar Panels
    • Portable Solar Panels
  • Marine Solar
    • Kits - Solar System Kits >
      • Flexible Solar Panel Kits
      • Semi-rigid Solar Panel Kits
      • Rigid Solar Panel Kits
      • Auxiliary Solar Panel Kit
      • Portable Solar Panels
    • Solar Controllers & Electrical >
      • MPPT DuoRacer Dual Output Series
      • MPPT Tracer Series
      • MPPT Victron Smart Solar Series
      • MPPT Xtra-N Series
      • PWM Duo Dual Output Controller
      • Electrical Components
    • Mounting Systems >
      • Flexible Panel Mounting Systems
      • Semi-rigid Panel Mounting System
      • Rigid Panel Mounting System - Top Of Pole
    • Inverters
    • Outboard Motor Lifting Crane
    • Solar Water Heating System For Boats
    • Visit Our Store
  • Lithium Batteries
  • Reviews & Installations
    • Reviews/Customer Comments
    • Gallery of Installations
  • Support
    • FAQ
    • Solar System Design & Installation
    • Manuals & Information
    • Solar System Installation Pointers
    • Troubleshooting
    • Contact Us
    • Solar System Installers
    • Battery Exchange Plus
    • Handy Products We Don't Carry
    • Freight Forwarders for International Shipping
    • About us
    • Call (248) 705-8337
    • Return Policy
    • Marine Solar Panel Sizing Calculator Tool
  • Blog