VEVOR Split Charge Relay Kit 6m 12V — 140A Automatic VSR, IP65 Waterproof Dual Battery Isolator

VEVOR's 12V Split Charge Relay Kit is an automatic voltage-sensing isolator that charges a secondary battery while protecting your starter battery, rated for 140A continuous use and built for harsh environments.

This complete kit brings a ready-to-install solution for vehicle, marine, and off-grid battery systems that need reliable battery management without constant monitoring. The VSR (voltage sense relay) senses charging voltage and links batteries when the alternator output reaches 13.3V, then isolates them at 12.8V, so your starting battery stays reserved for engine cranking while auxiliary batteries are charged during operation.

How does this split charge relay protect my starter battery?

The relay automatically separates the starter and auxiliary batteries when engine charging drops below the cut-out threshold, preventing auxiliary drains from flattening the starter battery. This preserves starting power and reduces the risk of being stranded due to a depleted starter battery.

• Automatic cut-in at 13.3V and cut-out at 12.8V for hands-free protection
• 140A continuous current capacity to support high charging loads
• Isolates batteries when vehicle is off to prevent parasitic drain
• IP65 rated enclosure shields electronics from dust and water

What comes in the kit and how easy is installation?

The package includes the relay plus all the wiring and fittings you need for a standard dual-battery installation, making it straightforward for DIYers or technicians to fit without sourcing extra parts. VEVOR supplies cables, terminals, fuse holders, cable ties, and a drill bit so you can mount and connect the unit correctly first time.

• 6 x 1 m red battery cables and 1 m black ground cable included
• Positive and negative marine battery terminals and multiple lug connectors
• Fuse holders, shrink tube, conduit, cable ties and mounting screws supplied
• Clear wiring layout and delay time (5s) built into the relay for stable operation

Will this hold up in marine and off-road environments?

The relay case is made from robust nylon plastic and rated IP65 for protection against dust and low-pressure water jets, making it suitable for boats, campers and off-road vehicles where moisture and vibration are common. The durable power studs and hardware resist corrosion and mechanical stress in demanding conditions.

• IP65 waterproof rating for splash and dust resistance
• M6 stainless steel power studs and rugged nylon housing
• Designed for extreme vibration environments like boats and 4x4s
• Low standby current use (8mA) minimizes drain when idle

How does the relay perform electrically and what safety ratings matter?

The VEVOR relay supports a continuous current of 140A and intermittent peaks up to 160A, suitable for most alternator outputs and auxiliary battery charging. It includes a short five-second delay to avoid nuisance switching from transient voltage spikes, and the kit's wiring and fuse components help protect the system from overcurrent situations.

• 12V DC operation with 140A continuous and 160A intermittent ratings
• Built-in 5-second delay prevents rapid on/off cycling from spikes
• Current draw: charging 280mA, standby 8mA to limit parasitic load
• Supplied fuse holders let you add appropriate protection inline

Who is this for? The VEVOR Split Charge Relay Kit is intended for vehicle owners, boaters, van-lifers, and anyone running auxiliary electronics from a second battery who wants automatic, reliable battery management. It's a practical upgrade for RVs, caravans, 4x4s, ATVs, UTVs, yachts and workshop battery setups where preserving starting power and charging accessories while underway are priorities. If you need a rugged, IP65-rated automatic isolator with comprehensive wiring accessories, this kit supplies the components and performance expected for demanding mobile and marine applications.