40 Watt Solar of use ?

Our 2017 T@G wide came like new, with a 40 wt solar panel. Is it worth fooling with? We have been getting along fine for 3 nights with just the Deep Cycle Marine and RV NAPA Battery. Run the frig at 38 or so, minimal lights, and CPAP. For years I have also carried a battery jump /compressor/ etc Box. The jump box runs my CPAP 2-3 nights. Sort of abused the battery this past winter. But it trickle charged back to 13 according to my trusty Fluke meter. Hate for the solar thing to go to waste if of use to anyone.