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Confused about what batteries I need?

Old 03-07-2011, 12:42 PM
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DN
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Question Confused about what batteries I need?

Bluewater 25 with twin Yam 200 HPDI's.

Two batteries. (Size 27)

I am not trying to "go cheap" I just want to know what type of battery I really need. (Meaning, I'll get whatever ones I should but don't want to go way overboard)

Besides starting the mtrs I have a gps and a stereo to power. Occasionally run the bait well pump.

Regular "starting battery", "Dual Purpose", "Deep Cycle", "AGM"?

Most recent batteries were the Deka Dual Purpose batteries...I kept up with them and they are almost 5 yrs old...no problems. As of right now I am thinking of getting the West Marine Starting batteries...Maintenance free ones?

Last edited by DN; 03-07-2011 at 12:55 PM.
Old 03-07-2011, 08:05 PM
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Those motors require a good "starting" battery. Check your owners manual some mfgs are requiring more powerful cranking batteries than you may think. The motors have good alternators so unless you are spending many hours drifting with electronics on and engines off "starting" batteries should be fine.
Old 03-08-2011, 01:01 AM
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Originally Posted by Shif View Post
Those motors require a good "starting" battery. Check your owners manual some mfgs are requiring more powerful cranking batteries than you may think. The motors have good alternators so unless you are spending many hours drifting with electronics on and engines off "starting" batteries should be fine.
Thanks.
I have a feeling I may just replace with what I have now (dual purpose) since they have served me well...they aren't "maintenance free" like the starter batteries. The battteries are a bit tough to get to but not impossible to check/add fluid.
Old 03-08-2011, 05:16 AM
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The West Marine Dual Purpose batteries are made by Penn-Deka. Same ones that you have now.

WM generally has a spring outfitting sale. With the coupons and the sale price, they wind up being pretty competitive.
Old 03-08-2011, 05:28 AM
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If you don't mind going the "deluxe" route, Sears DieHard Platinum marine batteries are the cat's meow.
Old 03-08-2011, 06:03 AM
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There is no reason each engine requires its own starting battery. You never start both simultaneously which would require twice the CCA.

So the ideal setup if you are going to replace the batteries anyhow is to put both engines on one good quality starting battery (High CCA) and dedicate the other battery to house loads (Deep Cycle battery). That way your house loads which are currently running off starting battery(ies) can never run the starting battery down. A Combiner100 between the two will keep both charged.

A good engine starting battery has a large number of very thin plates so it can put out lots of power for a short time. A deep cycle battery has a lower number of thicker plates so it may not hav enough amps to start an engine but it can run small loads all day.
Old 03-08-2011, 06:50 AM
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AGM's of your choice. I had the 200 HPDI's for 10 years, and about 5 to 7 of those years used the Cabela's Group 27 AGM batteries with them. They are great batteries and treated me GREAT. I sold the boat and they were still going strong. No maintenance.
Old 03-08-2011, 07:59 AM
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OK...now I am going to sound like even more of an idiot:

I don't know if the engines start with one of the batteries and the other battery serves as the "house" battery?

There are two (2) battery switches near the batteries and one you put on "1" and the other to "2" (as per Bluewater)

I don't know how I would find out what my system is set up for...maybe I'll call Bluewater?
Old 03-08-2011, 08:13 AM
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Just spoke to Bluewater...they have it set up so the starboard batter starts the Starboard engine and the port battery the port engine...only one battery however is used for the house...which in my case is the starboard battery (he said a 8 or 10 guage red wire will run between the house battery and its switch).
Old 03-08-2011, 08:53 AM
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Originally Posted by DN View Post
Just spoke to Bluewater...they have it set up so the starboard batter starts the Starboard engine and the port battery the port engine...only one battery however is used for the house...which in my case is the starboard battery (he said a 8 or 10 guage red wire will run between the house battery and its switch).
The setup Yandina describes is a far better setup, but I don't think you ought to try to do this yourself. Consider hiring a pro who knows boat electrical systems.
Old 03-08-2011, 09:23 AM
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maybe doing wrong??? have one engine 5.0 I/O not much equipment ie 2 fish/chart,wash down pump and bilge pump----- Run on # 1 (odd days) and 2 (even days) have 2 dual purpose batteries
Old 03-08-2011, 09:52 AM
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Originally Posted by rwidman View Post
The setup Yandina describes is a far better setup, but I don't think you ought to try to do this yourself. Consider hiring a pro who knows boat electrical systems.
I agree 100% and plan on having that setup done.

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