Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Captain
Posts: 53
Registered: ‎07-02-2018

Re: Starting battery drianed in 3 hrs.

Everthing in the boat is unchanged for over a year, what would be the correct charging voltage from the engine to Battery?  Thank you

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Captain
Posts: 152
Registered: ‎10-21-2015

Re: Starting battery drianed in 3 hrs.

Max charge voltage should be approximately 14.5 - 14.7 volt range.  A deeply discharged battery will hold that voltage level down until battery is sufficiently charged.

ElderSparky



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Captain
Posts: 807
Registered: ‎08-20-2017

Re: Starting battery drianed in 3 hrs.

Charging time to reach 14 volts on an analog dash gauge could take several at idle/trolling speeds but at cruising speeds it should reach 14 volts within about 20 minutes.
It is best to test charging output with the diagnostic software, a digital volt meter, or NMEA voltage data.
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Captain
Posts: 53
Registered: ‎07-02-2018

Re: Starting battery drianed in 3 hrs.

Thank you Sparky and Rick, checked battery 12.76 V, started motor at idle ran approx. 5 min and it went up to 13.80, how does that sound?. For the 3 hrs i was running the trolling motor(separate system 36 V) the only thing running was the 2 graphs and livewell.  I appreciate all your help.

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Captain
Posts: 152
Registered: ‎10-21-2015

Re: Starting battery drianed in 3 hrs.

12.76 V would indicate 100% state of charge for a lead acid battery at rest.  As voltage increased with running, it is obvious that at least some level of charging current is being supplied from engine.

 

To fully characterize the charging system, you need a means to measure charge current as well as the voltage.

ElderSparky



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