Dual Battery Isolator Kit 12V 140A, LCD VSR, Manual-Auto

12V dual battery isolator kit keeps your starter battery protected while automatically charging a second battery for reliable power on the road or water. The voltage sensitive relay (VSR) offers manual or automatic switching, plus a clear display for real-time voltage checks. Built for dual-battery setups in RVs, campers, boats, trucks, ATVs, UTVs, caravans, and off-road vehicles where stable auxiliary power matters.

Designed for demanding dual-battery use, this smart isolator helps separate critical starting power from accessories like fridges, lights, winches, and inverters. The sealed interior supports use in harsher environments, while the VSR switching keeps charging automatic once your system reaches the cut-in threshold. If you’re upgrading a caravan, overland rig, or marine setup, this kit is a practical way to add controlled auxiliary power—grab yours today.