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The VSR005 is a 12V dual battery isolator rated at 300A, with both automatic voltage-sensitive switching and a one-click manual mode. The manual mode lets a charged auxiliary battery back-feed the main battery to start the vehicle without jumper cables. An adjustable 3–60 second delay cuts relay chatter, and a dual LCD shows both battery voltages live from 4.5V to 20V. It suits RV, truck, boat and off-grid owners running a house battery alongside a starter battery. Against simpler VSRs, the display and manual override are the differentiators; the trade-off is a larger, busier unit than a plain relay.
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This dual battery isolator is a 12V, 300A voltage sensitive relay (VSR) for dual-battery systems. It works with lithium, lead-acid and other battery types, and the start-stop voltage is adjustable. It can be used in an RV, truck, boat or off-grid system.
It has automatic and manual modes. In manual mode, one click lets a fully charged auxiliary battery reverse-charge a depleted main battery, so the vehicle can be started without jumper cables. The delay time is adjustable from 3 to 60 seconds, which avoids frequent switching and helps extend the service life of the isolator and the batteries.
A high-brightness display shows the voltage of both batteries in real time, in a range of 4.5V to 20V. This helps diagnose circuit problems and check system status. The isolator has overvoltage and undervoltage protection. It is shockproof and dustproof.
