12V Split Charge Relay Kit 140A VSR with Voltmeter for Dual Battery

Keep your starter battery protected while charging your leisure battery automatically. This split charge relay kit keeps your setup running without manual switching or risk of draining power when the engine is off.

Get reliable dual battery charging for camper vans, 4x4s, boats, and more—so your trips stay powered without compromising your engine start.

Smart charging that protects your main battery every time

✅ Charge leisure batteries up to 220AH safely while you drive

✅ Prevent starter battery drain when the engine is off

✅ Monitor voltage in real time with a built-in digital display

✅ Switch between automatic and manual charging when needed

✅ Install easily with pre-made cables and included components

✅ Works with modern vehicles without ignition wiring

This kit uses a voltage sensitive relay (VSR) that detects when your vehicle is charging. As voltage rises, it connects your leisure battery so it charges alongside your starter battery. When the engine stops, it automatically isolates the batteries, ensuring your vehicle always has enough power to start.

The integrated digital voltmeter display shows battery voltage at a glance, giving you better control over your setup. An emergency switch lets you override automatic mode when needed, adding flexibility in real-world situations.

Everything is included for installation, from 3-meter ready-made cables with connectors to fuse holders, terminals, and fixing accessories. The pre-configured leads and clear instructions simplify setup, even in tighter spaces like camper vans or mobile workshops.

Compared to basic relay kits, this version adds real-time visibility and upgraded internal components for more consistent operation, especially in modern vehicles with CAN bus systems.

Everything needed for a complete dual battery setup.

Check battery voltage instantly with clear display.

Simple connections make installation straightforward.

Pre-made cables save time during setup.

Protect your system with included fuse components.

Secure connections keep power flowing reliably.

Keep wiring organized and easy to manage.

Fits neatly into vehicle electrical setups.

No extra parts needed to get started.

Each component supports a clean, reliable install.

Upgraded internals improve reliability over time.

Everything is included for a complete setup.

Power your trips with confidence without risking your main battery.