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Old 18 May 2008, 13:04   #1
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Country: Ireland
Town: Donegal
Boat name: Grey Seal
Make: Narwhal
Length: 4m +
Engine: 254HP
Join Date: May 2008
Posts: 14
Bit of a newbie Electronics Q

Hi people.
First post.
I've been pretend ribing in a yam 3.3, 15hp for past 3 years.(20knt so can't complain).
Anyway I'm about to take delivery of Narwhal 4m 25hp 4 stroke EFI Electric Start, 2 seat sofa & console & I'm wetting myself with excitment.

However I'm a complete gadget freak.
Iv'e already got a Garmin map/sounder on the way.
And I'm thinking of adding a waterproof stereo, kettle,searchlight etc, you get the idea.
Unfortunetly, having never had a battery onboard before, I'm clueless about whether this is possible.

Q. Will I be able to wire up any 12v thingy to the battery.?

Q. Can I add some of those cigeate lighter thingy's.?

Q. Can I take for granted the battery will charge from the running motor or do I need to tell the dealer I want some specific kind of battery/alternator etc.?

Q. How long will say a GSMAP run from battery if engine if off. Or rather will it run for say 2 hours with no negitave consequences.?

Q. Does the battery charge even in netural idol.?


Cheers for any help.

Gary
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Old 18 May 2008, 13:44   #2
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Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,639
Welcome To RIB.net. I was new to RIBs a coupl of years ago and I have found this fourum a great help.

Quote:
Originally Posted by Gaelmart View Post
.
Q. Will I be able to wire up any 12v thingy to the battery.?

Yes, you can wire up directly to the battery.

Q. Can I add some of those cigeate lighter thingy's.?

Yes, but you might not use it as much as you think.

Q. Can I take for granted the battery will charge from the running motor or do I need to tell the dealer I want some specific kind of battery/alternator etc.?

Yes, it will charge the battery.

Q. How long will say a GSMAP run from battery if engine if off. Or rather will it run for say 2 hours with no negitave consequences.?

It should be okay for 2 hours, no problem.

Q. Does the battery charge even in netural idol.?

It should do, but its a non-issue in practice.
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Old 19 May 2008, 12:04   #3
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Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by Gaelmart View Post
Hi people.
Q. Will I be able to wire up any 12v thingy to the battery.?
Yes, assuming we're not talking about something that draws hundreds of amps (well, actually, you could wire it up; probably wouldn't work, though.)


Quote:
Q. Can I add some of those cigeate lighter thingy's.?
Yes. Get good quality ones. The cheapies don't last too long near salt water.


Quote:
Q. Can I take for granted the battery will charge from the running motor or do I need to tell the dealer I want some specific kind of battery/alternator etc.?
It will be rigged to charge from the motor.


Quote:
Q. How long will say a GSMAP run from battery if engine if off. Or rather will it run for say 2 hours with no negitave consequences.?
Just chartplotter? Quite a while. I'd figure on something like 24 hours without too much trouble. You can get the operational draw from the manufacturer, and the amp/hour rating for the battery. Then do the math.


Quote:
Q. Does the battery charge even in netural idol.?
The battery will *probably* charge at idle speeds. Some motors don't put out enough voltage at idle, though. A voltmeter across the terminals should give you a hint as to what yours is doing.
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Old 19 May 2008, 12:44   #4
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Country: Ireland
Town: Donegal
Boat name: Grey Seal
Make: Narwhal
Length: 4m +
Engine: 254HP
Join Date: May 2008
Posts: 14
Cheers jyasaki.
Perfect answer.
Get's rid of some niggles fo me.

Gary
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