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This is a voltage-sensitive relay kit that connects a starting battery to an auxiliary battery and disconnects them automatically. It engages at 13.3V and releases at 12.8V, so the starting battery keeps priority and the aux battery charges only when the alternator is running. Unlike diode isolators, the solid-state relay avoids the roughly 0.6–0.7V drop a diode wastes, so the aux battery charges closer to full voltage. It suits trucks, RVs, boats and UTVs where a second battery runs accessories. The case is compact at 2.6 x 2.6 x 2 inches and IP65-rated for water, dust and vibration.
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This dual battery isolator kit uses a voltage sensitive relay (VSR) to share power between a starting battery and an auxiliary battery. It connects the two automatically, so the batteries stay linked without the voltage drop of a traditional isolator diode. The relay closes at 13.3V and opens at 12.8V, which keeps the starting battery charged.
The solid-state relay is IP65-rated for water, dust and vibration resistance. It measures 2.6 x 2.6 x 2 inches, so it fits under the hood or in a battery relocation setup. The kit is intended for automotive, truck, RV, UTV and marine use, including boats and off-grid power systems.
The kit includes the cables, terminals and hardware needed for installation, along with step-by-step instructions. Installation connects a power wire in and a power wire out.
