I use my Love Bug
as my cold weather unit when I camp alone. My wife has health issues that make having an RV a good choice for us. I installed a Progressive Dynamics 9245 power converter that is a charger, 12 volt power supply, desulfide function. After I installed the PD 9245, an older battery
was able to maintain a good charge and lasted over a year after I had originally given up on it. These converters are not cheap but I have been getting my coach batteries to last alot longer since I installed it.