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post #1 of 7 Old 05-07-2011 Thread Starter
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battery charging with the outboard

Has anyone used a Flexcharge mod. NC 25A / 12 , or something similar, to control the charging voltage from a Yamaha 9.9, or similar type engine.
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post #2 of 7 Old 05-07-2011
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Don't think a solar/wind charge controller will work well for an engine-run alternator - different mode of regulation.

"Seek to understand before you seek to be understood."
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post #3 of 7 Old 05-07-2011
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If the outboard has an alternator it will not need anything else nor benefit from adding anything.

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post #4 of 7 Old 05-07-2011 Thread Starter
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I have gel cells, and I'm afraid of using un-regulated voltage
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post #5 of 7 Old 05-07-2011
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It is not unregulated, as well as being very low in output. The Yamaha 9.9 only has a 6 amp output with a built in regulator.

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post #6 of 7 Old 05-07-2011
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There was a guy who posted a schematic diagram for a circuit you could build yourself for just that purpose. When I have more time I'll try to find it and post a link.
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post #7 of 7 Old 05-07-2011
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tim, an LM317 adjustable regulator (the 78xx or 79xx fixed regulators would do but I don't recall if they'd match a gel voltage) would be an easy DIY. All the manufacturers have spec sheets for this and the only addition would be using a power transistor to handle the output of the engine. The regulators typically handle 1.5A max by themselves, one power transistor could boost that to handle a 10A load. Again, the mods are in the spec sheets from all the manufacturers.

Marc, you really need to confirm whether you've got an alternator or a generator, whether it is regulated, and what the output is (volts and max amps) to know what your options will be. Generators and alternators are regulated very differently.
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