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Old 28 May 2013, 12:25   #1
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Dual Battery - 50 HP Yammie

Hi All,

I am thinking installing second battery - i am thinking of using

http://assets.bluesea.com/files/reso...heets/6833.pdf

any commets or better method.

Aim: to run bilge pump when i am away and get charged during running..

S.
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Old 28 May 2013, 14:34   #2
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What 50hp Yam is it? If it's an old tech one, you might be better off using a 20w solar panel to charge it.
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Old 28 May 2013, 14:37   #3
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What 50hp Yam is it? If it's an old tech one, you might be better off using a 20w solar panel to charge it.
nope - generation 1 four stroke - 2000
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Old 28 May 2013, 15:02   #4
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Scott I'm a bit old school!! I use two 120ah squadron marine batteries with a regulator. When I'm running I switch to both and when I leave on 1 or 2 leaving me a bat for starting fully charged when I come back to boat.
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Old 28 May 2013, 15:10   #5
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yes - but am I right saying that the switch needs to be special if switching when running or alternator can blow up?
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Old 28 May 2013, 15:39   #6
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Yes thats why its marked as above so as you can't do that very thing, you cant go directly from 1 to 2 you have to go thru 'both' as the safety
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Old 28 May 2013, 16:12   #7
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It might be a better idea to run a VSR relay if you're never going to use the 2nd battery to start the motor.
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Old 28 May 2013, 17:55   #8
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It might be a better idea to run a VSR relay if you're never going to use the 2nd battery to start the motor.
Looks like a cheaper option - apart going old school ....I want it idoit proof...

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Old 29 May 2013, 11:22   #9
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yes - but am I right saying that the switch needs to be special if switching when running or alternator can blow up?
It's a make-before-break switch. The connection you're moving to is made before the one you're moving from is disconnected. You should never have an open condition unless you select "none" or "off". I think most battery selector switches are made this way.

There is another type of switch that has a field disconnect signal built in, but your motor has to have the disconnect as well for it to be of any use.

jky
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Old 29 May 2013, 11:32   #10
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As it's a 50, what about the bit of string on the front of the engine when / if it goes flat?

How long you planning on leaving it? Based on the normal "MacWeather" you could end up coming back to a nice floating paddling pool anyway! (and then have to lug a flat battery round all day, which could become properly gubbed after a few of those kind of events).
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