Linking Panels Together
If you would like more power then solar panels can be linked together either in Series for increasing the Watts and Voltage to the combined output with Current as rated from a single panel or in Parallel to increase output to the combined Watts and Current with Voltage as per single panel output.
An example of linking in Series is where battery Voltage increases from 12V to 24V therefore higher voltage is needed for charging purposes.
An example of linking in Parallel is where 12V battery capacity increases from 100A to 200A and requires a higher charging current.
Whether Parallel or Series connected for the solar panels the correct Solar Charge Controller must be used which will work with increased solar output.