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Need help picking battery type (please)

Old 11-13-2002, 04:25 PM
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Default Need help picking battery type (please)

I have a 21 foot boat with which I do not run much in the way of electronics when the engine is off. Just a radio and maybe another 12 volt accessory of some type.

Currently I have two dual purpose batteries, one is for starting and the other is for the electronics mentioned above. One battery is dead and the other is getting there so I am gonna replace them.

Should I

1) Pick a starting battery to start with and a deep cycle for the radio.

OR

2) Pick two starting batteries.

OR

3) Sell the boat and say "The hell with all this!!" (lol, just kidding)

Thinking about buying optima batteries as my brother is a dealer and I can get them at cost.

WHAT DO YOU THINK?? THanks in advance

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Old 11-13-2002, 04:29 PM
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Default Need help picking battery type (please)

Two dual purpose batterys (starting/deep cycle) and connected so that one is redundant to the other, not one as a starting battery and one as a house battery.

Thom

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Old 11-13-2002, 04:45 PM
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Default Need help picking battery type (please)

How do you connect two batteries so they're redundant? Our boat will have dual batteries and I want to make sure they're redundant.

Also, if a boat has dual batteries but a switch with 1/2/OFF positions, are both batteries charged while running or is only the battery selected charging? Isn't it only the battery that is selected that charges?
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Old 11-13-2002, 06:43 PM
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Default Need help picking battery type (please)

Yes, that's why you alternate which battery you are using. The wireing is simple.

Thom

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Old 11-13-2002, 06:57 PM
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Default Need help picking battery type (please)

I already have a 2 battery switch and also have a battery combiner made by West Marine (better than an isolator).

Gel cell and AGM batteries do not come in dual purpose types.

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Old 11-13-2002, 06:58 PM
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Default Need help picking battery type (please)

Tides, I may be wrong but I think Yamahas are set up to charge both batteries (has dual output).

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Old 11-13-2002, 07:00 PM
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Default Need help picking battery type (please)

Error
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Old 11-13-2002, 08:17 PM
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Default Need help picking battery type (please)

Take a look in 'search' above...I think I read something about jell batteries that was not positive...can't remember what it was. Any help out there? [img]/infopop/emoticons/icon_frown.gif[/img] [img]/infopop/emoticons/icon_redface.gif[/img]
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Old 11-14-2002, 05:00 AM
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Default Need help picking battery type (please)

I don't know if I could justify the cost of Gell-Cell batterys. I spend very little time running my boat upside down, and I have room to mount my batterys without flipping them over to get them into their compartment, so why would I want Gell-Cells? To their credit they do outlast conventional batterys but not to an extent that justifies the expense, in my mind. Everyone to their own though and if someone wants them then they should have them.

Thom

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Old 11-14-2002, 08:33 AM
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Default Need help picking battery type (please)

A couple reasons about the gel cells.

1) My brother can get wholesale for about same cost as I can buy regular batteries retail.

2) AGM and Gel cell batteries can stand complete discharging better than regular batteries.

3) When unused regular batteries discharge at a rate of 1-3% daily. Gels and AGMs have about 1-3% drop monthly.

One downside to some of the fancier batteries is the charging voltage cannot be too high but this is not as much of a problem for the Optima.

My basic question is....will a start battery be sufficient to run my house loads since i do not have high demand.

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Old 11-14-2002, 10:19 AM
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Default Need help picking battery type (please)

That's it "the charging voltage can't be too high, etc..." I don't think you'll have a problem without the deep cycle. Years ago we didn't know the difference. Now if you we're using downriggers all the time with an electric troling motor, I'd have to think about it. [img]/infopop/emoticons/icon_wink.gif[/img]
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Old 11-14-2002, 12:22 PM
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Default Need help picking battery type (please)

Has anyone tried a product called " battery equaliser"? Aparently you add 1/2 ounce to each cell of a starting battery, or 1 oz to a deep cycle, and it cleans the plates.
They claim it will double or even triple the life of marine batteries.
Their on the net.

Cheers Tyee [img]/infopop/emoticons/icon_smile.gif[/img]
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Old 11-14-2002, 12:22 PM
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Default Need help picking battery type (please)

Get two Start batts. Done.

Yes, two start bats will be fine. With what your running, hell, you don't even need a battery, get a solar panel!! [img]/infopop/emoticons/icon_biggrin.gif[/img]

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Old 11-14-2002, 12:57 PM
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Default Need help picking battery type (please)

If you can get Optima batteries at a good price go for it. I've used them for years in my vehicles and I love em. In fact if you have to pay full price I'd go for it!
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Old 11-14-2002, 01:26 PM
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Default Need help picking battery type (please)

Back to the earlier questions:

1) Yes, newer V-6 Yamahas have two charging leads and an isolator built-in and can charge a starting and house battery simulataneously.

2) With your light electronics load, a simple 1/2 both switch and two Optima batteries would be fine with everything running off of the switch output, i.e., normally use one battery for all functions and try to alternate.
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Old 11-14-2002, 01:32 PM
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Default Need help picking battery type (please)

I run a starting battery, a deep cycle battery, three on/off switches and a battery combiner.

The starting battery powers the engine and is wired to one of/off switch.

The deep cycle battery powers all accessories and is wired to a second on/off switch.

The third on/off switch is set up to parallel the batteries when needed and the combiner allows both to be charged at the same time but separating them when a load is placed on one or the other. I can start off the deep cycle in the event the starting battery goes dead for some reason (has yet to happen though...knock on wood). [img]/infopop/emoticons/icon_biggrin.gif[/img]
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Old 11-14-2002, 01:45 PM
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Default Need help picking battery type (please)

Birdman is right on. Your load is zilch and plain old vanilla cranking bats are all you need.
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Old 11-15-2002, 09:31 AM
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Default Need help picking battery type (please)

Thank you for your advice. That confirms what I was thinking. Will go with two start bats. One advantage of the optimas is you can still drain their start bats down pretty good and they will handle it. The start bat just wont do as many deep discharge cycles as their deep cycle will.

Thanks again.

By the way, thanks for the backhanded compliment, Birdy. Maybe I will give the solar panels a try. Not certain how long it will take to turn a V8 starter though. [img]/infopop/emoticons/icon_wink.gif[/img]

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Old 11-15-2002, 02:52 PM
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Default Need help picking battery type (please)

Go with smaller (group 24) deep cycles. They last forever when they discharge during non-use (winter, etc).

Put a set in my boat (old I/O, with V-8), and never had a lick of trouble. Killed starting batteries every other year with my rig. Mostly from discharging and sitting over winter.
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Old 11-16-2002, 05:24 AM
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Default Need help picking battery type (please)

Thats the thing about the Optima's. Their start batteries can be heavily discharged then recharged with no damage. In addition, they only lose 1-3% per month of charge compared to regular batteries which lose 1-3% per day.

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