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Battery Charger on my Outboard

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javadano
Deckhand

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USA
15 Posts

Initially Posted - 09/06/2004 : 18:49:42

Hey All,
I am looking to rig my 8 hp 2 cycle Mariner with a battery charger?!? Any ideas. Or am I just making thing harder than it needs to be? Lugging my battery in-n-out the boat just isn't fun...

dano

Edited by - on

Dave Laux
Captain

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318 Posts

Response Posted - 09/06/2004 : 19:15:10

I'm assuming you have no charge capability built in that is not hooked up. Most outbnoards have the charge coil under the flywheel. What they do nor have is the rectifier. You need a wiring diagram, a rectifier, and a wire to connect to your battery. Most outboards have very small charging capability though so you might want to check out the specs. and see if the system will support your power consumption . Dave

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aeckhart
Master Marine Consultant

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USA
1709 Posts

Response Posted - 09/06/2004 : 20:45:26

My 89 Eveinrude 9.9 has a 4 amp alternator which was barely adequate to keep my batteries charged, considering that I have to have an anchor light on every night. I now have a Siemans 10 amp solar panel which keeps my house battery "in the green". I understand that many manufacturers are now installing 8 and 10 amp alternators. Much better!

You should check with your motor manufacturer to see if there is a alternator add-on kit available. I'm sure a local dealer can help you out. The only time I lug a battery is in the spring to install them on the boat, and in the fall to lay up for the winter.

Al
GALLIVANT #5801

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lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts

Response Posted - 09/06/2004 : 21:24:22

Your outboard, if it has a charging coil at all, is probably no more than 4 or 5 amps at max RPM's. At cruising RPM's it might put out only an amp or two - not enough to give any significant charge to a typical 80-amp-hour deep cycle battery. A much better power solution is a 30 to 50 watt solar panel. These can be found for as little as $200, they have no moving parts to fail, and they charge your battery whenever the sun is shing whether you are on the boat or not. If you are like most of us who are not yet retired, you are probably using the boat only on weekeds, and it just sits in a slip or dry storage during the week while you are at work. With a solar panel, those 5 days of charging will top off the battery and it will be full when you arrive at the boat for the weekend. I do not yet have my panel mounted, it sits in the cockpit during the week and I put it away in the V-berth when I arrive at the boat for a weekend sail. Then when I go home at the end of the weekend, the last thing done as I lock up is to put out the solar panel.

Edited by - lcharlot on 09/06/2004 21:26:37

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.