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Battery Setup Advice

Old 02-14-2011, 03:40 PM
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Default Battery Setup Advice

Hey all. I recently purchased the boat in my signature (2300DV).
The boat is setup like this --- 3 group 31 Odyssey batteries. One is the cranking battery, one is the house battery, and one is strictly for the kite/deep drop outlets. The starting and house batteries are hooked to a standard battery switch. They are both charged via the engine, the House battery getting its charge from the auxiliary charging circuit that is an option on the Yamaha F250. So, both batteries get a charge from the engine without actually being wired "together".
The kite battery is not connected to the other batteries, nor does it receive a charge from the engine. The boat has a 3 bank on board charger with an outlet for charging via extension cord from shore power. That is the only way that the third battery gets any charge.
I will never be able to utilize that shore power option because I keep the boat in dry storage at a marina. I plan on removing the battery charger altogether (and it will be for sale! ).
My original idea was to purchase a Yandina combiner that I would connect to the starting (or House) battery and the third battery. While running, both batteries will charge, with priority given to the lowest of the two and then floating the charge on both once everything is topped off. Once the engine is off, both batteries are separated and cannot draw down each other. I've used the Yandina combiner in the past with much success and love the simplicity of the install, the compact design, and the customer service. But this could all be accomplished with the Blue Seas system, as well.
Today, I began thinking that maybe I could wire both the house and kite battery together to create essentially one BIG house battery. They would then both receive a charge from the engine via the aux circuit, I would never have to worry about killing a battery from the stereo or bait pumps, and since I rarely will actually need the third battery dedicated strictly to kite/deep drop stuff it makes more sense to put it to everyday use for me.
What are your recommendations and if I can indeed connect both batteries to create one large battery, how do I wire it?

Thanks for any and all input.
Old 02-14-2011, 03:57 PM
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Just connect positive to positive and negative to negative on both batterys with short cables.
Old 02-14-2011, 09:51 PM
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This should not be happening. Is your alternator on the fritz? If its the stock unit, that might be the issue. I have a 900 watt stereo on a crappy corolla 70amp alterantor and small old battery, and this never happens.
Old 02-15-2011, 03:05 AM
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Originally Posted by beennasuna View Post
This should not be happening. Is your alternator on the fritz? If its the stock unit, that might be the issue. I have a 900 watt stereo on a crappy corolla 70amp alterantor and small old battery, and this never happens.
what shouldn't be happening?

nothing is wrong with the setup i have. everything works great. the killing the battery comment was a hypothetical situation. i just want to modify it to better suit my everyday uses.
Old 02-15-2011, 06:23 AM
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Do as Fisheron said. Pos to Pos and Neg to Neg between your house and spare batteries.
Old 02-15-2011, 06:46 AM
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Gotcha. So, by wiring them in parallel it effectively doubles the capacity while keeping it at 12 volts. If I wired in series I'd get a 24v system. Sounds good to me. And it prevents me from having to purchase a combiner for it all to charge correctly.

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