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A 12V dual battery isolator kit built around a 300 amp voltage sensitive relay. It switches between manual and automatic modes, shows both battery voltages on an LCD screen, and adjusts its charging thresholds for lithium and lead-acid batteries. It also adds a start-stop delay to avoid chatter and an emergency reverse-charging function. It suits owners of 4x4s, campers, boats and vans who run a second battery for fridges, winches or accessories. Against simpler fixed-threshold isolators, the adjustable voltage and live readout are the main draw; the trade-off is a busier install with more wiring and settings to get right.
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This is a 12V, 300 amp dual battery isolator kit built for dual battery systems. It charges two batteries at the same time without interrupting power to your devices. It works in off-road vehicles, RVs and boats.
The voltage sensitive relay adjusts charging voltage automatically for different battery types, including 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.
If the starter battery is out of power, you can switch the isolator to manual mode. It then uses a fully charged secondary battery for emergency reverse charging, so you can 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.
