Smart Voltage Sensitive Relay and Battery Isolator – Reliable Power Management for Dual Battery Systems Keep your auxiliary battery charged and protect your main battery with this Smart Voltage Sensitive Relay. Designed for automatic operation, it connects or disconnects your auxiliary battery based on your main battery's voltage, ensuring performance and protection without manual intervention. Key Benefits and Features: Automatic voltage monitoring: Engages or disengages the auxiliary battery according to the main battery's voltage level, ensuring reliable operation in all conditions. Builtin protection: Disconnects the circuit when input voltage drops below 11V or rises above 17V, preventing over‑discharge or over‑voltage damage to the main battery. Dual battery charging: Enables both batteries to be charged simultaneously from your vehicle's alternator, improving efficiency and reducing downtime. Intelligent charging priority: Charges the main battery first, then begins charging the auxiliary battery once the main battery is fully charged. IP68 waterproof rating: Can withstand dust, water, and harsh weather, making it dependable for outdoor and marine use. Compact and versatile: Small size allows installation in confined spaces without sacrificing performance. Wide compatibility: Suitable for RVs, cars, ATVs, UTVs, Polaris, Can‑Am vehicles, boats, 12VDC marine systems, 4WD trucks, caravans, and more. Specifications: Input voltage protection thresholds: Disconnects below 11V or above 17V Waterproof rating: IP68 for maximum durability Designed for 12VDC electrical systems Practical Use Scenarios: 1. Road trips in an RV: Keep house batteries charged while protecting the starting battery from being drained. 2. Marine applications: Power onboard electronics and accessories while ensuring your engine battery remains ready to start. 3. Off‑road adventures in ATVs or 4WD vehicles: Maintain power for winches, lights, or portable fridges without risking your primary battery. This Smart Voltage Sensitive Relay offers a dependable, maintenance‑ solution to managing dual battery setups, ensuring power availability when you need it most while safeguarding critical components.