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Old 06-06-2012
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2nd Battery or Battery Booster

Hey everyone,

This is my first of probably many posts! I recently purchased my first vessel and have a boatload of questions. I am wondering if I should have a 2nd battery with a switch as a dedicated starting battery...just in case I drain my primary battery while overnighting on the lake? Or could I buy one of those battery booster pack/jumper boxes to keep on the boat? I am plugged into shore power at the dock for most of the week...so I could keep the booster charged up. I appreciate any and all ideas.

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Bangbang
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Old 06-06-2012
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Re: 2nd Battery or Battery Booster

What type of boat and how do you envision you'll be using it?
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Old 06-06-2012
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Re: 2nd Battery or Battery Booster

What kind of boat, diesel or gas inboard ?
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Old 06-07-2012
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Re: 2nd Battery or Battery Booster

It is a Hunter 27 with a 1 cylinder Yanmar inboard diesel. I primarily spend 1-2 nights on it a week. I daysail and spend the night at the dock. I am anxious to spend the night out on the lake, but not before I solve my battery query.
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Old 06-07-2012
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Re: 2nd Battery or Battery Booster

I would install a second battery and keep it in reserve for engine starting/emergency.

Do you have a 1/2/both/off switch?
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Re: 2nd Battery or Battery Booster

No I do not have a switch yet. This is why I was considering the booster box for cost effectiveness. I can buy one for about $100 bucks. If I go the 2nd battery route...then I am looking at the price of the battery, battery box, perko switch, etc....I am not afraid to spend the money, I just don't know if it is necessary? I am hoping the results of this post will sway me one way or another!
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Old 06-07-2012
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Re: 2nd Battery or Battery Booster

My $.02.

I've got a 27' Tartan and we use 2 group 31 batteries (upgraded from group 27) for our house and starting bank. We don't overnight enough so our old batteries lasted nearly 7 years, which is decent for battery life expectancy.
The more batteries with the more amp hours (AH) on it the better. Deep cycle lead acid batteries can be found at places other then West Marine, if you have time to shop around.
You won't regret adding another battery to your bank if you plan on doing significant overnightings.
Bring the battery booster along too. It might save your ass one day.
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Re: 2nd Battery or Battery Booster

What kind of switch do you currently have?

Even with one battery the ability to isolate the battery is needed - as well as proper fusing near the battery.

A 1/2/both/off switch can be purchased for around $30 or less.

A group 24 starting battery shouldn't be more than $50 or so.

A plastic battery box is under $10

A few cables and you're finished for about the same price as the booster box.
This gives you a second battery that will charge from the alternator or shore power charger that is always ready when needed. I would use the main battery for both house loads and engine starting, keeping the second battery for emergencies.
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Old 06-08-2012
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Re: 2nd Battery or Battery Booster

Yanmars usually have a compression release which will make it easier to start if you have a weak battery. Or if you have a hand crank. Thanks.
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Re: 2nd Battery or Battery Booster

Thanks to all for your replies. I think that I will be getting an extra battery in the near future.
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