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.

• Delivers manual or auto operation with one-button control for fast connect/disconnect when you need it.


• Monitors voltage on the display for at-a-glance battery status and easier power management.


• Protects batteries by disconnecting at low/high voltage to reduce deep discharge and overcharge risk.


• Fits 12V dual battery systems in RV, camper, truck, boat, yacht, ATV/UTV, and off-road builds.


• Includes install essentials—cables, lugs, heat shrink, screws, and cable ties for a cleaner setup.

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.

• System voltage: 12V


• Max charging current: 140A (within 5 minutes)


• Continuous charging current: ≥100A


• Cut-in charging voltage: ≥12.3V


• Cut-out charge voltage: ≥12.6V


• Protection disconnect: below 11V or above 17V


• Relay size (L × W × H): 2.7 × 2.7 × 2.2 in (68 × 68 × 56 mm)


• Total kit weight (with accessories): 3.3 lb (1.5 kg)


• Main material: ABS