Understanding Basic Solar

 100/30  150/50  75/10 - What do the numbers mean?

These numbers can seem a bit confusing.  The first number is the amount of maximum open voltage from the panels.  The second number is how many amps go to the battery for charging.  So, the goal with any system is to maximize the amount of charging available per day.  The bigger the system you build, the larger the controller you need.