Contactor/Relay

Reliable Battery Contactors & Relays for Off-Grid Systems

Building a resilient 12V, 24V, or 48V power system for your caravan, RV, 4WD canopy, or marine vessel requires robust power management. Battery contactors and smart relays are the gatekeepers of your electrical system, designed to automate charging, isolate battery banks, and prevent deep discharges that can irreversibly damage expensive lithium or AGM cells. Whether you are managing complex split-charging requirements or setting up a dedicated low voltage disconnect, selecting the right switching gear ensures your off-grid setup operates flawlessly under high-load conditions.

Our comprehensive range features industry-leading solutions designed for harsh mobile environments. We stock advanced Victron BatteryProtect modules, intelligent Cyrix battery combiners, and high-capacity Blue Sea Systems magnetic latching relays. These components allow you to safely manage dual battery systems, route alternator charge to auxiliary banks, and automatically shed non-essential loads before your primary battery bank is drained. For larger commercial, marine, or tiny home applications, heavy-duty 500A contactors and anti-islanding relays provide the extreme durability required for high-current inverters and grid-tied safety.

• Low Voltage Disconnects (LVD): Automatically disconnect loads to protect your battery bank from over-discharge. Many models feature integrated Bluetooth for smart, programmable voltage thresholds.
• Voltage Sensitive Relays (VSR): Intelligently combine starter and house batteries when a charging voltage is detected, and isolate them when the engine is off.
• Lithium-Specific Relays: Dedicated charge and load relays designed to integrate seamlessly with lithium Battery Management Systems (BMS).
• Heavy-Duty Contactors: Ultra durable 500A continuous ratings for managing high-capacity inverter loads and winch circuits without severe voltage drop.

When designing your off-grid architecture, it is essential to pair your contactors with appropriate manual override controls and circuit protection. Consider integrating your automated relays alongside heavy-duty Battery Isolation & Selector Switches to provide a physical service disconnect. Additionally, ensure all relay circuits are properly safeguarded with appropriately sized Fuses & Fuse Holders to protect your cabling from dead shorts.

How to choose guidance

Selecting the correct battery contactor or relay depends entirely on your system voltage, continuous current requirements, and the specific automation logic you need. First, match the component to your nominal system voltage (12V, 24V, or 48V). Next, evaluate the maximum continuous current; if your inverter draws 200A, your contactor must comfortably exceed this rating to prevent overheating. If you are protecting a lithium battery, look for smart contactors or low voltage disconnects that communicate directly with your BMS. Finally, decide if you need unidirectional flow (like a simple load disconnect) or bidirectional flow (like a battery combiner for dual-bank charging). Compare these specifications against your power audit to ensure safe and efficient operation.

Backed by a decade of experience, our Australian family business is dedicated to providing high quality products and expert before and after support. We understand the unique demands of mobile and off-grid electrical builds, ensuring you get the right gear the first time. Upgrade your energy system with our premium battery contactors and smart relays today, and experience the reliability of fast dispatch directly to your door to get your project moving.