If they are wired the same as mine... hopefully.
It is a fused direct link to the battery, 10 amps. Here is the adapter
, best price I have seen. Someone posted a link on here to an Ebay site where you could buy just the plug for ~$12-$15. It can also be used as a power feed to power up small battery powered items.
I use a Renogy 100 watt suitcase setup
to top up the batteries on my motor home. There are several companies that make similar units. Great for boon docking at a state park, you can park in the shade and put the panels out in the sun.
FWIW I think Renogy is getting ready to discontinue the unit I have and sell an upgraded model with more efficient solar panels. They pop up on Ebay, Amazon and other sales sites periodically at a discounted price.