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One (large ) cranking battery/2 motors - bad idea?

Old 03-27-2003, 06:50 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Space limits me to 3 batteries and I want to dedicate as much to the house bank as possible - i.e., two good deep cycles. The motors are 2 new 200 hpdis. Am I wrong to think that the single large cranking battery will do the job given the supposed quick start of the motors and the subsequent charging? I would even change the cranking battery every year just to avoid hassles.. bad idea?
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Old 03-27-2003, 07:53 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Sounds good to me. As long as the other batteries are there as backup. I have only two, both are the combination deepcycle/starting battery. Quality of hookup and/or use are more important than quanity.

Boston Whaler, "MUMBLER", 24' Outrage (1996), twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 03-28-2003, 05:53 AM
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Default One (large ) cranking battery/2 motors - bad idea?

Why not use three large deep cycle batterys if its power storage you are looking for? Keep this in mind - there is no application where a "starting" battery would be used that a properly sized deep cycle battery would not serve just as well.

Thom

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Old 03-28-2003, 08:39 AM
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Default One (large ) cranking battery/2 motors - bad idea?

Thom, thanks. What I thought was that the new Yammy 200 hpdis with their computers etc. required a larger dose of cranking amps that a deep cycle was not designed to do. With my space limit of 2/3 batteries and my desire to run 12v stuff and some other things off of an inverter, I assumed I would have to have at least one cranking battery isolated for the motor. If not, then your suggestion would be perfect.
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Old 03-28-2003, 10:30 AM
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Default One (large ) cranking battery/2 motors - bad idea?

Rayos,

I'm not sure that its really a matter of them needing more craning amps. I suspect that what they really require is that the voltage not drop while the engine is cranking. If that is the case then its quite possible that typical deep cycle (and I use that term interchangably with dual purpose - Deep Cycle/Starting) batterys may in fact be better suited than standard 'starting' batterys would for those engines. This is all just speculation on my part though so you should get other opnions and then decide for yourself.

Thom

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Old 03-28-2003, 01:31 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Thanks Thom .. will do.
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Old 03-28-2003, 05:13 PM
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Default One (large ) cranking battery/2 motors - bad idea?

rayos,

Before purchasing those deep cycle batteries, check with your local Yamaha dealer because there is a minimum CCA rating necessary to crank those HPDI's. You shouldn't have a problem finding a deep cycle with the needed CCA's, but it might be a slightly larger Group 27 or 31. I went through the same situation when I repowered my 23 Grady with 2-150 HPDI's.

Good Luck,
Chris
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Old 03-28-2003, 10:52 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Thanks Chris, will check with the dealer..
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Old 03-30-2003, 04:07 AM
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Default One (large ) cranking battery/2 motors - bad idea?

I do not know about your MCA or CCA requirements for your engines, but consider this:

1. You only start one engine at a time, right? So it is logical that one battery, in charged condition should be able to handle two engines.

2. A deep cycle battery should be able to provide sufficient cranking amps, but double check your engine requirements.

3. I run dual group 24 deep cycles in my boat, as I do not have space for the larger group 27 batteries unless I went with only a single battery. One of those batteries can crank my Ford 302 without problems.

4. Deep cycle batteries tend to last longer, as the plates are thicker and can take more discharges than starting or dual purpose batteries.

5. Having multiple and identical batteries has another advantage - you have spares in place.

6. You can always add switches to bundle the batteries in parallel if/when more amperage delivery is needed.

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Old 03-30-2003, 04:49 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Tidester.. thanks. will call Monday to find out what the cranking amp needs of the motors are. The more deep cycles the better - as long as they get the job done...( and I plan on putting them in parallel )
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Old 03-31-2003, 12:57 PM
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Default One (large ) cranking battery/2 motors - bad idea?

You may want to touch base with onsclr. In another post he said he fit four batteries in his Islander. Using two big 225AH batteries in one bank for the house service would give you a lot of capacity. Especially if you plan on putting in an inverter to give you AC power underway.
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Old 03-31-2003, 05:20 PM
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Default One (large ) cranking battery/2 motors - bad idea?

Yeap Sail.. he was very helpful when I was gathering info on the boat. Will email him for more info...Did a search and found a thread in which he discusses a/c (!) on the boat..Thanks

[This message was edited by rayos on 03-31-03 at 07:46 PM.]
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