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Diode Battery Isolater

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Forum Name: Marine Electronics
Forum Discription: Boat Stereos, Security, Navigation, Lights, Switches, Gauges, etc.
Printed Date: August 05, 2021 at 10:28 PM

Topic: Diode Battery Isolater

Posted By: filth
Subject: Diode Battery Isolater
Date Posted: February 18, 2017 at 5:10 PM

If I wanted to keep reach full charge capabilities for each battery (3, all different wattages) would I need to have a diode isolater for each?



Posted By: davep.
Date Posted: February 25, 2017 at 4:25 PM
Battery Isolators are usually one or two inputs (alternators) and 2-4 outputs (battery banks). The model number usually indicates the maximum amperage of the alternator input. I.e. a "702" is a 70-amp, 2 bank. A "1203" is a 120-amp, 3 bank isolator. They make bigger capacity, but usually only 2 bank. There are also "specialty" isolators for use with certain alternators' excitation and regulator requirements. Basically, select an isolator that has higher capacity than your alternator's maximum output, and 3 bank outputs.

You must pay attention to alternator "sensing" to avoid voltage drop across the isolator that will result in chronic under-charging.

You must also pay attention to having large differences in battery capacity, particularly if the large bank is usually the one needing the most charging. The smaller batteries may be overcharged while the big bank is nearing "sense" voltage.

There is a lot to understand about using diode battery isolators to get optimum performance and battery life. Do your research.

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