Connect-Ease 3 12V Battery Parallel System w/Solar [RCE312SLR]3 12V Battery Parallel System with Solar The Connect Ease allows connecting three 12 volt batteries in parallel to provide users increased runtime when away from any wired, plug in power source. The Connect Ease (3) 12V parallel system was specifically with RV and off grid enthusiasts in mind whose power requirements may also require a solar connection. It is compatible with other solar products, and does provide a direct Heat Shrinkable accessory