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Diode battery isolators are crucial components in managing multi-battery systems, especially in vehicles and marine vessels where it's essential to separate the starter battery from auxiliary batteries. These devices ensure that multiple batteries can be charged simultaneously from a single alternator without the risk of them being electrically connected, which prevents the accessory battery from discharging the starter battery if it runs low.
The Argo Battery Isolators stand out in the market due to their efficient design incorporating Schottky diodes. These diodes are known for their low forward voltage drop, which is a significant advantage in battery isolator applications. The voltage drop across the isolator is approximately 0.3 V at low current levels and about 0.45 V at the rated output. This minimal voltage drop ensures that the charging process is efficient, with less energy lost as heat, thus maintaining closer to the alternator's output voltage.
To address the inherent voltage drop issue further, Argo Battery Isolators are equipped with a compensation diode. This feature allows for a slight increase in the alternator's output voltage to compensate for the voltage drop across the diodes in the isolator. This compensation is vital to ensure that the batteries can be charged as fully as possible, reducing the risk of undercharging which can lead to premature battery aging.
However, installing a diode isolator is not without its considerations. Inserting the isolator directly in the cabling between the alternator and the batteries can slightly reduce the charge voltage. This reduction may prevent the batteries from being charged to their full capacity, affecting their performance and lifespan. It is recommended to consult the book 'Energy Unlimited' or seek specialist advice when installing a diode isolator to ensure proper installation and operation.
Additionally, some alternators require a DC voltage on the B+ output to initiate charging. Traditional diode or FET splitters might block the return voltage/current from the batteries to the B+, preventing the alternator from starting. The newer 'AC' diode isolators address this issue by featuring a special current-limited energize input. This input activates the B+ when the engine's run/stop switch is closed, ensuring that the alternator starts charging as intended.
In summary, Argo Battery Isolators provide a sophisticated solution for managing multi-battery systems, ensuring efficient charging while preventing unwanted discharge cycles between batteries. Their innovative design, incorporating Schottky diodes and compensation techniques, offers an effective way to maintain battery health and extend service life, making them a valuable component in any dual or multiple battery setup.
