An example of panel in series: If you look at the specs of a 12V solar panel, you will find that the Voc is around 22Volt. For a 75/15 MPPT the solar voltage can be as high as 75V. This will allow you to connect up to 3 x 12V panels in series.
Note on charge current at different battery voltages : For a 75/15 MPPT the current rating is 15 A. This is the current going into the battery. This means that with a 12V battery you will get less power into the battery than with a 24V battery.
Solar array power To determine the total power of a solar array, you will have to add the power of each module no matter if they are connected in parallel or in series.
Both these arrays are 200W:
Series parallel arrays are possible as well this is a 400W array:
To help you deign a solar array and to match it to the correct solar charger see this calculation sheet here.
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