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The True Dual Lithium Battery Smart Isolator is a solid-state relay that automatically connects two batteries for charging when either receives a charge, then isolates them when charging stops. It works with dual lithium setups or a lithium plus AGM/lead-acid mix, and only links the second battery after the first reaches 13.5V. Its dual-sensing design means a charger on either battery engages the relay to charge both. Small and rugged, it suits DIYers who want automatic battery management without manual switching.
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This is a 12V smart battery isolator that automatically controls charging between two batteries with a common ground. It keeps the batteries isolated when no charging source is present. It is compact, with no large heat sink, and uses a 3-wire connection at the battery, so existing alternator wiring does not need to be bypassed.
The isolator is dual sensing and senses the charge of both batteries. If either battery is receiving a charge, such as a battery charger connected to the auxiliary battery, the relay engages and charges both. It works with dual lithium batteries or with a lithium battery combined with an AGM or lead acid battery. It makes sure the first battery reaches 13.5V before connecting the second, which helps when the charging source is too low in amps to charge all batteries at once.
When the start battery reaches 13.5V, the relay engages and charges the start and accessory banks together. When the voltage drops below 13.2V, for example when the engine is stopped, the relay disengages and separates the batteries. This prevents draining the start battery and protects sensitive electronics powered from the house battery. Isolators placed in sequence between batteries can charge several batteries, such as two or more house batteries on a larger boat. Unlike conventional diode isolators, which lose at least 0.6V, it has no voltage drop.
