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

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