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Old 08 May 2004, 11:35   #1
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Which size Battery

Hi can anyone advise me on battery size for my boat?
It has 100hp Johnson, fish finder, GPS & VHS!
It has at the moment 2 X 75 amp Marine/leisure batteries which I think may be a bit overkill!
The recommended cold crank start for the engine is 340 or 360 canít quite remember, but UK batteries all seam to be in amps!
Any thoughts anyone?
Nick
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Old 08 May 2004, 11:42   #2
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That is approximately the same size cranking power as you need for a small petrol family car. Why not just go for a couple of batteries from a motor factor, will be cheaper than buying a leisure battery, seeing as it's a rib and has no need to run cabin lights, tv's, dvd's, etc without the engine running.
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Old 08 May 2004, 12:11   #3
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1x 85 amp hour leisure battery should be sufficient for your RIB. The advantage of a leisure over car battery is its ability to be run completly flat and still recharged without damage to the cells or plates which will happen if car bettery is run completly flat.
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Old 08 May 2004, 12:34   #4
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Thank you Paul that sounds good to me!
Jizm as the boat can be left for long periods of time the leisure battery should be better bet as it can take longer periods with out being charged! Car batteries kneed to be used/ charged on a regular basis.
Nick
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Old 08 May 2004, 13:12   #5
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Nick

You can get 85AH leisure batteries for around £35, cheaper than normal car batteries.
Our local A1 motor parts outlet is doing them for this price.
Other wise try a caravan or camping outlet.

Don't forget to check which terminals you have.

John
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Old 08 May 2004, 13:21   #6
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Quote:
Originally Posted by Nick Hearne
Jizm as the boat can be left for long periods of time the leisure battery should be better bet as it can take longer periods with out being charged! Car batteries kneed to be used/ charged on a regular basis.
Nick
Not mine. My leisure batteries are pretty flimsy compared to my car batteries. They discharge equally fast and they're not designed to have large currents drained from them.
Go for a car battery. On it you will find, **CCA = Cold Cranking Amps. This is the starting current available from the battery. You'll find quite a small amp/hr battery will easily give you the current you require.
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Old 08 May 2004, 13:25   #7
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Nick

My recently departed Johnson 90 2 str had a 40AH battery which was fine.

John
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Old 08 May 2004, 14:35   #8
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marine/car battery

Remember car batteries arnt sealed, they gas and miniscule amounts of acid can come out, this is why we often top up with de ionised water, marine batteries however are sealed, bear this in mind with a boat going up and down waves etc etc
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Old 08 May 2004, 15:16   #9
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Go for a car battery!!

I of my other pastimes is Off Road driving & as I have a winch fitted this 'kills' batteries & so have gone though 7 batteries in 3 years due to the buckled plate syndrome.
This has cost me a grand total of £58.

Reason:
Buy it from Halfords with a 4 year garantee... & keep taking them back when they die.
Oh,
I STILL HAVE A 4 YEAR garantee on my newest battery...
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Old 08 May 2004, 16:09   #10
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So I go for a cheep battery from Halfords & just take it back when I kill it off for a new one!
Nick
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