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post #1 of 12 Old 06-17-2019 Thread Starter
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Add a battery?

We have two batteries on our 1999 352 Beneteau; a 70 amp group 24, and a 135 amp 4D. I also have a 12v/55 amp alternator and a 20 amp battery charger. I only have the analog battery monitor that is original to the boat. What alterations do I have to make to add an additional house battery?
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post #2 of 12 Old 06-17-2019
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Re: Add a battery?

I don't think you need any alterations to add a battery, but if the batteries are older than a year or so and have been used regularly, I wouldn't stick a new one in parallel with them. I have assumed the G24 was a start and the 4D the house.

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Re: Add a battery?

How much useable house battery do you think you want
What is age of the 4d
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post #4 of 12 Old 06-17-2019 Thread Starter
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Re: Add a battery?

Both batteries were new last season.
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Re: Add a battery?

In that case, I don't think there is any issue with adding another battery in parallel to increase your capacity. You don't need to make any alterations, although you may wish to upgrade your battery monitoring.

The G24 is a start battery, correct? And you plan on adding another 4D, correct?

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post #6 of 12 Old 06-17-2019
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Re: Add a battery?

Hey,

If you have space in the battery compartment all you need to do is buy another battery. Connect is in parallel (plus to plus and neg to neg) with the existing house battery, and you done.

Of course make sure it's securely mounted, fused, etc.

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post #7 of 12 Old 06-17-2019
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Re: Add a battery?

Quote:
Originally Posted by BarryL View Post
Hey,

If you have space in the battery compartment all you need to do is buy another battery. Connect is in parallel (plus to plus and neg to neg) with the existing house battery, and you done.

Of course make sure it's securely mounted, fused, etc.

Barry
Like he said but I would move the neg to the new battery and leave the pos to the original, or vice versa.

Cheers, Uncle Bob the 1st from Sydney Aust.
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Re: Add a battery?

Why?
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Re: Add a battery?

You are creating one large bank.

You 4 D ah seem light at 135 . Most are more powerful. If thatís true you only have 63 usable. For you boat, thatís kind of small, but I donít know how you use your boat, nor itís daily electrical diet. Refrigeration can eat up that 63 amps quickly.

I have heard the rule of thumb is that the alternator should be able to put out 25-40% of the battery bank. That keeps it from working to long and insures a quicker recharge.

4D are heavy at 80-90 lbs. hard for one person to maneuver. Maybe in the future youíd consider replacing them with 6 volt golf car batteries. At 45 lbs.

These are all general statements. Iíd suggest reading up on the electrical system in your boat , one of the more expensive systems. Itís good to match battery ,capacity, battery usage, battery recharging or you can waste money.


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post #10 of 12 Old 06-17-2019
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Re: Add a battery?

Quote:
Originally Posted by Gregrosine View Post
Why?
Hi, I believe that by wiring this way it ensures that both batteries are discharged/charged evenly, = longer life.

Cheers, Uncle Bob the 1st from Sydney Aust.

Last edited by Uncle Bob the 1st; 06-17-2019 at 09:52 PM.
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