Any experience here with Paxcess portable panels?

[TexasJeff]

I have a 120 watt / 18v Paxcess solar panel that I can use with my Paxcess 330 watt power center. What I would like to do is to use this portable solar panel as an additional charging source for the RV. So, I installed a solar side-port wired in to the house AGM batteries. The side-port is separately wired from the controllers which manage the 900 watts on top.

This is the details of my setup: (1) 120 watt solar panel-DC8mm plug -> (2) DC8mm to SAE cable -> (3) RV side port SAE connection.

I'm not sure how to mitigate the 18volts the panel is putting out with the 12v AGM batteries. How would you connect this 18v panel to enable it to charge the 12v batteries? Can you recommend a charge controller that can be inserted in to my setup as described? Thanks in advance for any help.

Here are links to the cable and side-port details on Amazon:

1. Paxcess 120 watt solar panel:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

2. DC8mm to SAE cable:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

3. RV side port:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1