2917 State Hwy 7, Bainbridge, NY 13733 1.800.786.0329

Do I need to buy a charge controller for an Automotive or Marine Solar Panel?

No you do not.  The panel has a trickle charger installed into it. This means that the panel can lose some capacity in storage due to self-discharge, but with a trickle charger it will replaces lost amp-hours to your battery.  This will ensure a  quick start and extending battery life.