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A voltage-sensitive relay (VSR) that automatically connects a second battery to the charging system when the main battery reaches 13.3V and disconnects it when voltage drops below 12.8V. It also has a manual mode for forced linking, a real-time voltmeter, and protection against over- and under-voltage. It suits owners of trucks, boats, UTVs, and campers who want a simple dual-battery setup without a complex DC-DC charger. Compared with basic relays, it adds a digital display and manual override, but its 90–120A rating limits use with high-output alternators.
In stockSold by neat jkisReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Availability unknown
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Lowest price we've seen: $18.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
This is a 12V digital voltage sensitive relay (VSR) that works as a dual battery isolator. It connects and disconnects the circuit between two batteries for split charging. It suits trucks, UTVs and ATVs, boats, marine use and buses.
A built-in voltmeter shows the real-time voltage. With two batteries connected, it shows the one with the higher voltage. A red indicator lights, and the voltmeter turns on, when the circuit is connected.
It has two modes. In manual mode, you hold the button for 3 seconds until the blue LED comes on. Each press then connects or disconnects the circuit. In auto mode, you hold the button for 3 seconds again and the blue LED turns off. The circuit connects automatically above 13.3V and disconnects automatically below the cut-out voltage.
