12V dual battery isolator kit helps keep your starter battery protected while charging a second battery automatically for accessories. This split charge relay uses a voltage-sensing relay (VSR) to connect at 13.3V and isolate at 12.8V, so power-hungry loads won’t leave you stranded. Built for RV, marine, truck, caravan, camper, and off-road setups, with a compact housing and IP65 protection for demanding environments.

Designed for quick-scan reliability, this voltage sensitive relay kit manages charging automatically—no manual switching—so your auxiliary battery is ready for fridges, lights, winches, and inverters while your primary battery stays ready to start. The rugged nylon plastic case and stainless M6 studs are built for real-world vehicle and marine installs, from camper vans and RVs to yachts and ATVs. Set up your dual battery system with the included components and get back to the road or water—grab yours today.