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Thread: Does an outboard charge the battery?

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    Member BRWNBR's Avatar
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    Default Does an outboard charge the battery?

    I知 on a 150 merc outboard. Curious if the outboard charged the battery or if I need to charge it on occasion?
    Also can I run a gps/fish finder off the battery as well or will that drain it to fast?
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    Member sayak's Avatar
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    All electric start outboards charge their starter batteries... or should anyway.

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    Member Daveinthebush's Avatar
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    Should not be a problem. My Honda 90 ran the lights, GPS and the radio and I never had to charge the battery. Even my 8 h.p. kicker will charge my main boat battery if I can get that running. It will pull start as well as elec. start. Once running I have power to the main.

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    Use a battery tender when your boat is parked.
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    Member Andy82Hoyt's Avatar
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    Should charge it no problem. Electric start outboards are designed that way. I installed a battery tender over the winter. Super happy with it so far. We will see how it does come winter.


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    Member 4merguide's Avatar
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    Quote Originally Posted by BRWNBR View Post
    I知 on a 150 merc outboard. Curious if the outboard charged the battery or if I need to charge it on occasion?
    Also can I run a gps/fish finder off the battery as well or will that drain it to fast?
    What charged the battery on an outboard used to be called a magneto. I don't know if that's what they still call it these days?
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    Member Tyin 1 On's Avatar
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    Outboards use a stator which will charge a battery when running.
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    Their website says the new models run a 60amp belt driven alternator. Should be plenty

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    Member akdeweyj's Avatar
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    Quote Originally Posted by BRWNBR View Post
    I知 on a 150 merc outboard. Curious if the outboard charged the battery or if I need to charge it on occasion?
    Also can I run a gps/fish finder off the battery as well or will that drain it to fast?
    You might want to put your plotter/gps/fishfinder on a switch that you can manually shutoff........ From personal experience, some Garmin units still draw power when they are shutoff on the unit itself & will run your battery dead...
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    Member Bullelkklr's Avatar
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    My yamaha f250 has a 50 amp alternator. Small outboards (2-25hp) typically do not provide much amperage but will have a magneto. I have an onboard 120vac charger that I plug in while at home. A battery tender will lengthen the lifespan if your batteries. Be careful if you only have 1 battery not to run it dead. The manual for my f250 says the motor needs to be turning 1500rpm for the alternator to create amperage.




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  11. #11

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    I have 2, 6 volt golf cart batteries tied together on my 20' Harvey with a 70 hp 4 stroke E'rude. When I'm pulling pots I always have the outboard at a high idle but beyond that I don't worry about it. Never had a bit of trouble. I hook up a battery tender for a few days 2 or 3 times during the off season.

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    Some outboards use a rectifier that uses power from the stator to charge the battery. Most modern larger outboards use an alternator just like an automobile. GPS and light loads are fine. Never a bad idea to use 2 batteries with a selector switch especially if you leave unattended with a bilge and float switch on one bank.

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    Member Sobie2's Avatar
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    I too run a 150 Mercury Fourstroke. It does charge the battery. But I run a separate battery for the fish finder/GPS because if you start and stop your motor directly off the battery you will most likely experience your plotter flickering on/off resetting due to the sudden draw of the motor. Blue Seas may offer a solution to this, like their add a batter ACR where you can run dual batteries and so they both get charged by the main motor but it isolates the chart plotter/electronics aka the "house batteries" from the power surge draw from starting the main. I don't have one but I should.

    Sobie2

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    Quote Originally Posted by Sobie2 View Post
    I too run a 150 Mercury Fourstroke. It does charge the battery. But I run a separate battery for the fish finder/GPS because if you start and stop your motor directly off the battery you will most likely experience your plotter flickering on/off resetting due to the sudden draw of the motor. Blue Seas may offer a solution to this, like their add a batter ACR where you can run dual batteries and so they both get charged by the main motor but it isolates the chart plotter/electronics aka the "house batteries" from the power surge draw from starting the main. I don't have one but I should.

    Sobie2
    I have exactly what Sobie2 is talking about and it is awesome. I have the one with the AC charger built in as well. nice unit
    Ryan
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