Depending on your electric usage, 50W may or may not be sufficient. Any significant Solar panel that charges a battery needs a charge controller to prevent overcharging and possible damaging the battery. With the possible exception of trickle charging solar panels.
After 7 inches of rain and cloudy skies for 3 to 4 days, I was thinking of a hydroelectric system for extra power. (Ha Ha!).
Solar is good for sunny days, but you have to plan for cloudy days.
2014 Flagstaff 206LTD
2008 Nissan Armada LE 4X4 TV
Amateur Astronomer Golf
Retired Electrical Engineer