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Electrical design....

Old 10-09-2008, 07:32 AM
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Default Electrical design....

I doing my electrical install. from scratch, and when I mean scratch , I mean totally new. I was wondering if there was anybody here that could look over my design to make sure I'm doing everything right, that I'm not forgetting anything or to give advice on things that could be improved...

I will start with the engines side.
Twin E-tecs 250HP on the back. I do not know what battery cable size these comes with, probably 2AWG or 4AWG, but I will routed them thru the rigging tube, in to the boat and splice them to 1/0 cable to make it to the console.
I liked somebody's idea of using a small piece of copper pipe at home depot to splice the 2 cables.

On the console I'll have a Sears grp 34 880cca for each engine and 1 grp 31 1150cca for the house.

I will use the blue seas system 7610 ACR and 5511e battery switches to control the batteries.

I'm planing to equalize grounds thru a copper ground bar at the console.

That's my main backbone... I hope not to bore anybody, soil I will stop here...
I will appreciate any comment or suggestion.
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Old 10-09-2008, 10:04 AM
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Default Re: Electrical design....

There will be a voltage loss due to the distance between the batteries and the engines. Your starting batteries and charger should ideally be as close to the engines as possible, due to the magnitude of the starting loads. It would also be good to use a deep cycle battery for your house system, with a good voltage meter visible. I think you should have a 1-2-both switch near the starting batteries. A central, switched and fused buss bar that is easily accessible should go in the console, well protected from being splashed, even when the cover is open, incase you have to do some trouble-shooting or repairs on the water.
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Old 10-09-2008, 10:34 AM
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Default RE: Electrical design....

emudryj - 10/9/2008 10:32 AM


I liked somebody's idea of using a small piece of copper pipe at home depot to splice the 2 cables.
Huh?
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Old 10-09-2008, 10:41 AM
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Default Re: Electrical design....

sandyda - 10/9/2008 1:04 PM

There will be a voltage loss due to the distance between the batteries and the engines. Your starting batteries and charger should ideally be as close to the engines as possible, due to the magnitude of the starting loads. .
Well, the charger doesn't really matter, but for the engines, you have far too long a run of cable without circuit protection. That and the voltage drop.

You ask for suggestions, I suggest you get one or two good books on 12 volt boat wiring and study them until you understand everything. Make sure you follow USCG and ABYC codes and make sure you fully understand the concept of circuit protection.

BTW: The battery charger needs circuit protection at both ends of the wire because it is fed from both ends. The charger is supplying power and so are the batteries.
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Old 10-10-2008, 10:04 AM
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Here's how you do it. Blue Seas Power Posts. Also notice the Buss Bar up high. This is a place to make connections for all your pumps. It serves as a test point when trouble shooting and makes it simple to swap in a new pump without having to do connections down in the bottom of the bilge.

The stock cables that come with the Outboards are 4ga. These connect to the Power Posts. Then the heavier gage cable connects to the power posts and goes forward to the console. I'd need a measurement of the run to recommend the gage size.






Your motors have a 2nd charge wire on them.


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Old 10-10-2008, 04:44 PM
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Default Re: Electrical design....

warthog5 - 10/10/2008 1:04 PM

Here's how you do it. Blue Seas Power Posts. Also notice the Buss Bar up high. This is a place to make connections for all your pumps. It serves as a test point when trouble shooting and makes it simple to swap in a new pump without having to do connections down in the bottom of the bilge.

The stock cables that come with the Outboards are 4ga. These connect to the Power Posts. Then the heavier gage cable connects to the power posts and goes forward to the console. I'd need a measurement of the run to recommend the gage size.






Your motors have a 2nd charge wire on them.

Man thats very nice!!!!
I really like it, shame those stupid post are 22 bucks each.... but I wil probably go that route...

I got already the Busbars and a common ground bar(actually 2 one for the back and one for the console)...

Would you mind showing the inside of your console???
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Old 10-10-2008, 08:51 PM
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Default Re: Electrical design....

warthog5 - 10/10/2008 10:04 AM

Here's how you do it. Blue Seas Power Posts. Also notice the Buss Bar up high. This is a place to make connections for all your pumps. It serves as a test point when trouble shooting and makes it simple to swap in a new pump without having to do connections down in the bottom of the bilge.

The stock cables that come with the Outboards are 4ga. These connect to the Power Posts. Then the heavier gage cable connects to the power posts and goes forward to the console. I'd need a measurement of the run to recommend the gage size.






Your motors have a 2nd charge wire on them.

That is a very clean wiring job! I also noticed the shutoff valve on the fuel filter. Thats a great idea! Not sure if the newer boats come that way standard but neither of my boats have that. I think I smell fuel in my future.
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Old 10-10-2008, 10:21 PM
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Default Re: Electrical design....

Would you mind showing the inside of your console???
You would not be able to tell anything if I showed you that.

This boat has 2 small consoles. The STB side is full of stuff and it is crammed. For this size boat there are a LOT of systems on it.

To give you a idea here are some shots still in the transom looking up under it. Fly By Wire controls.





This is inside the Port console.





Just one of my drawings for the Bilge pumps.

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