SunElec.com Look for 12 volt panels, and a simple PWM controller. You might need to call them, as there are not many 12 volt panels listed online, yet they stock more than they update the online list. In other words they get in more panels weekly, but update the website only a couple of times a year.
With a 120 watt solar panel, you can extend your dry camping by weeks.
If you change to LED light panels, you can cut down on your battery use too!
AliExpress.com THen search for 24 LED 5050 panel. I bought 50 of them for $1.20 each. These are used to light up my RV, and also along the exterior of my house! They only use about 0.15 amps each, compared to a 1.2 amp regular light!
Fred.