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Author Topic:   Optimax 115 Charging system
rock5219 posted 08-11-2007 02:14 PM ET (US)   Profile for rock5219   Send Email to rock5219  
I have a Ranger boat. Does the [Mercury 115-HP OptiMax outboard motor] charge the cranking battery, and maintain charge on its own?
jimh posted 08-11-2007 02:18 PM ET (US)     Profile for jimh  Send Email to jimh     
A Mercury OptiMax motor uses an automotive style alternator to provide battery charging current. The alternator has a voltage regulator associated with it. The output of the charging system is a constant voltage, and any battery attached to it receives charging current as long as its terminal voltage is less than the output voltage of the charging system. The fixed output voltage is probably about 14.2-volts. The charging current tapers as the battery terminal voltage rises. This type of battery charging system is just about universal among outboard motors. Dedicated battery chargers powered from 120-VAC may have more sophisticated charging techniques and will vary the charging voltage in response to the battery terminal voltage in order to provide a better chemical reaction in the battery.

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