Solar used for storage battery topoff
Hi I'm a shooting enthusiast and I have my RV for staying at the tournaments. So I'm not doing much boondocking and staying at full campgrounds. But my RV sits unplugged at a campground most of summer when not being used. I'm thinking of putting 100 w solar system just to keep the batteries topped off while not plugged in. I'd like to get something that I can grow into if I decide to start boondocking more. Getting close to retirement age. Like to start RVing more. I have 4 battery class 27 with full generator and inverter in a DP. Is a home depot 100w system for ~$300 a good starter system with room to grow? I don't now if I should spend extra money on a mppt controller out of the gate not knowing if ill ever need it. If not Home depot can you recommend a good starter system?
2005 Fleetwood Revolution Le 40E, 2013 Harley Davidson Street Glide