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Old 15 November 2014, 05:49   #1
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Adding a battery to a SIB

I've been thinking about adding a battery to my SIB, it would only be powering a small amplifier and Nav Lights at the most. I have several small 12V Sealed Lead acid batteries (I believe about 7aH) but are these suitable? My outboard has a charging circuit but would I need a rectifier between this and the battery? (It's a Yam 30DMO 1991) If so can anyone recommend something suitable? I would be using a proper waterproof battery box, proper cabling etc
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Old 15 November 2014, 06:34   #2
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Some folks put their batteries into sandwich type containers. I would recommend charging it at home and on the boat. Use LED running lights to cut power demand. Use a motorcycle type regulator not a rectifier. The rectifier will let it go over voltage and smoke your sealed battery.

where to mount a fishfinder transducer

Battery type on a Sib for engine start.

I need a battery for my Fish Finder???

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Old 16 November 2014, 09:42   #3
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Would you be able to recommend a regulator? I can only find DC DC ones online and I'm assuming a need a AC DC regulator
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Old 16 November 2014, 13:57   #4
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First you need to know how many wires are needed? I believe most are three wire, but could easily be wrong. Most motorcycles, snowmobiles, and PWC's will use the same type and can probably be utilized. I used one from a Kawasaki motorcycle bought off of Ebay for a killer deal. If I remember correctly it was under $20. Search Ebay for a motorcycle regulator. Typically you can buy a universal regulator for around $75 US. I just had to cut the wiring ends off and find a place to bolt it on. They get very warm/hot depending on how much energy it is producing. It will also need to clear the motor cover.

Either way go and look at your motor to see what it needs, then report back. Some motors even come with the regulator installed.
Technical Article: How a Motorcycle Charging System Works - ElectroSport

You can see my regulator on the left with the cooling fins. the yellow wires are from the stator. (Picture was actually taken to show my awesome on water repair of the broken link that changes timing )

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Old 16 November 2014, 14:43   #5
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I will go and check the motor out tomorrow, and then let you know!
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Old 16 November 2014, 14:53   #6
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My motor does have a charging circuit in place bit I haven't found anything online to suggest that it is a DC power source, I will investigate further! I have attached two pictures just showing where the charging socket is, if anyone has the same model (30DMO 6J8) and knows please share!
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Old 22 November 2014, 12:40   #7
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Had a look at the engine today, and it appears that it has a 2 phase alternator fitted (two leads from the stator) that go into what looks like a regulator rectifier (from what yours looks like) I had the engine idling today and I took a multimeter to the connections inside the black box output thingy (pictured above circled in yellow) which is connected to the regulator rectifier. The reading was about 0.5V... is this normal? Or will it go to 14V when a battery is connected?
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Old 22 November 2014, 15:11   #8
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It should produce something but may require a battery to energize the circuit first. There is one way to tell. Hook up a battery and measure voltage with it off and running. If it goes up towards 14 volts it is charging.

Does your boat motor have a starter motor?
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Old 22 November 2014, 15:19   #9
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The engine is pull start, hence no need for a huge deep cycle battery I will perhaps dig a battery out tomorrow and test it :-)
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Old 29 November 2014, 08:21   #10
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Or get a regulator / rectifier off another outboard.

My Merc has a Honda one as I was toasting batteries with monotonous regularity as the Merc one just rectified....
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