Solar panel size for powerboat

Solar panel size for powerboat

This is the table showing what charge controller goes with what panels.  It depends on your system voltage, for example if you have a 12 volt boat the 100/50 can accommodate 700 watts of panels but if you have a 24 volt boat the same controller can accommodate 1400 watts

There are a few other things to keep in mind.  
  • If there is any chance of the panels being shaded unequally they should be broken up into groups of equal shade.  
  • You can put your panels in series or in parallel.  
  • The voltage of the panel needs to be a minimum of 5 volts more than the actual battery voltage to get the MPPT started.
  • The first number in the part number is the maximum allowed input voltage (that is the open circuit voltage of the panel)  so in a 100/50 charge controller 100 volts is the maximum allowed input voltage and they would like you to keep the design voltage to 10% below that.
  • For safety reasons you should keep the panel voltage in the range that will not electrocute you, I personally would not like to get a shock of much more than 50 volts
  • The wireboxes are terminal covers to prevent you from getting a shock if you accidentally touched the terminals of the MPPT

    • Related Articles

    • Calculating wire size in a solar system

      The current flowing in the wires of a solar system depends on the power that is being transferred.  The relevant formula is Watts = Volts x Amps.  When calculating wiring sizes there are two separate circuits operating at different voltages and so ...
    • Solar System for a Catamaran

      When planning a solar installation on a catamaran you first need to consider shading.  If all the panels are shaded equally then you can group them together with a single charge controller.  If however you end up with panels that are Port, Starboard ...
    • How to calculate wire size

      For DC wires there are two things to consider, the ampacity of the wire and the voltage drop.  In low voltage DC circuits the voltage drop tables will give you the larger result in most if not all cases. Here is a link to the tables: Voltage Drop ...
    • MPPT troubleshooting section in the instruction manual

      The links below go directly to the troubleshooting section of the relevant instruction manual: Smart Solar MPPT 75/10 up to 100/20 Smart Solar 100/30 and 100/50 Smart Solar 150/35 and 150/45 Smart Solar 150/60 and up Smart Solar 150/70 VE Can and up ...
    • Fuse and DC cables for MultiPlus 12/3000

      The normal fuse you would install with the 12 volt MultiPlus 12/3000 is at least 350 Amps.  This is because it has a surge capability and because as the battery voltage varies so does the current.  A 350 amp fuse will avoid nuisance tripping caused ...