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This is a 12V dual battery isolator rated at 140 amps that combines a voltage sensitive relay with a manual override and a voltmeter. It charges a main and an auxiliary battery at the same time, adjusts charging voltage for lithium or lead-acid batteries, and shows both battery voltages on an LCD screen. The manual mode lets you reverse-charge a flat starter battery from the auxiliary battery without jumper cables. It suits off-road, RV and boat owners running a second battery. Against simpler VSRs it adds the display and manual override, but it is a generic unit rather than a name-brand isolator, so build quality and documentation vary.
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This is a 12V, 140 amp dual battery isolator kit for vehicles with two batteries. It works as a voltage sensitive relay (VSR) and charges both batteries at the same time without interrupting power to connected devices. It is designed for off-road vehicles, RVs and boats.
The isolator adjusts its charging voltage to the battery type. It works with various lithium and lead-acid batteries. It supports flexible voltage adjustment and has built-in delay protection to avoid loss from frequent start-stop. An LCD screen shows both battery voltages in real time.
In manual mode, a fully charged secondary battery can reverse-charge a drained starter battery. This lets you start the engine without jumper cables. The housing is high-strength plastic with strong impact resistance. A special treatment helps keep water and dust out.
