12V 140A Split Charge Relay Kit Dual Battery Isolator for RV & ATV

Keep your main battery ready to start every time, while still powering your gear. This split charge relay kit automatically separates and charges your batteries, so your vehicle never gets drained by accessories.

Run lights, fridges, or camping equipment with confidence. Your primary battery stays protected, even when the engine is off.

Smart battery control without manual switching

✅ Keeps your starter battery ready by isolating it at 12.8V cutoff

✅ Charges both batteries efficiently once voltage reaches 13.3V

✅ Handles up to 140A continuous current for demanding setups

✅ Works reliably outdoors with IP65 resistance against dust and water

✅ Installs quickly with included cables, terminals, and accessories

✅ Maintains low standby draw at just 8mA to preserve battery life

This dual battery isolator automatically connects and disconnects based on voltage. When your engine runs and voltage rises to 13.3V, both batteries charge together. When the engine stops and voltage drops to 12.8V, it separates them, protecting your main battery from drain.

The included full installation kit removes guesswork. With cables, connectors, fuse holders, and mounting hardware included, you can set it up without sourcing extra parts. The simple 3-wire connection works with existing vehicle wiring.

Built for real conditions, the relay features a sealed internal layer and nylon housing that resists vibration, dust, and moisture. With IP65 protection and a 5-second delay system, it delivers stable performance in off-road, marine, and camping environments.

Unlike basic setups, this system manages charging automatically without needing constant monitoring or manual switching. That means less effort, fewer mistakes, and consistent power where you need it most.

Delivers stable power control across dual battery systems.

All components included for faster, easier installation.

Supports reliable dual battery charging on the go.

Built for consistent use across demanding environments.

Everything needed for a complete setup included.

Connects easily with minimal wiring complexity.

Performs reliably in wet and dusty conditions.

Resists vibration for steady, long-term operation.

Provides strong, consistent current flow to devices.

Fits RVs, ATVs, boats, and off-road setups.

Choose cable length that matches your setup.

Includes terminals, cables, and mounting hardware.

Longer reach for flexible installation options.

Complete kit ensures smooth installation.

Supports extended layouts without compromise.

All components organized for efficient setup.

Ideal for larger vehicles and complex builds.

Everything included to get started immediately.

Power your gear freely without risking your main battery.