I am completely new to solar panels. I know almost nothing about them. We boondocks and dry camp about 50% of the time in our 5th wheel. We have 2 deep cycle lead acid batteries. When the batteries need recharging, we have a Champion 3100W Inverter Portable Generator that we plug the power cord from the RV into by the use of a 50 amp to 30 amp adapter.
I want to add a portable solar panel such as Harbor Freight Underbolt Solar100 Watt Solar Panel Briefcase
https://www.harborfreight.com/100-watt-solar-panel-briefcase-57991.html
Can I connect this solar panel directly to my battery with a alligator clips or do I need some type of controller to keep the panel from overcharging my batteries. I think the output of the solar panel is 14 to 22 volts..