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  #21  
Old 04-30-2012
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Re: Please critique my charging schematic

While eyes are focused here, I've got a couple questions. I noticed that there is a switch position that connects the two batteries in parallel. If one battery is discharged while the other is fully charged and the switch is put into both, would the current flow be dangerous? Why not just diode isolate the two batteries for charging purposes? Diodes are a few dollars each, the echo device is ~$100.00.
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Old 04-30-2012
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Re: Please critique my charging schematic

I'll toss another schematic at you. Everything here works;
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Re: Please critique my charging schematic

Here - in living color - are the ABYC Color Code recommendations;

You CAN vary from this, as long as it is documented, and still be ABYC compliant.

Also, yellow is the preferred color for DC negative, so that you don't mix it up with AC hot.
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Re: Please critique my charging schematic

The fuse types on the batteries in the above schematics are these;

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Re: Please critique my charging schematic

"There is the same fault indicator that a Blue Seas breaker has - it shuts off. "
Well, yes, but we expect a breaker to be a breaker. These look like the common lighted 12-volt switches made, sold, used, by many sources. There's no way (from the picture) to tell that these are breakers, instead of the common lighted switches, is there?

meme-
An echocharger isolates the batteries while consuming very little power. A diode isolator consumes about 1/2 volt all the time, so you are wasting power. They're cheap but they're inefficient.
And yes, paralleling one good battery with one bad one will pull down the good one until they equalize. Not necessarily dangerous but a good way to kill your good battery.
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Old 05-01-2012
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Re: Please critique my charging schematic

Quote:
Originally Posted by Captainmeme View Post
While eyes are focused here, I've got a couple questions. I noticed that there is a switch position that connects the two batteries in parallel. If one battery is discharged while the other is fully charged and the switch is put into both, would the current flow be dangerous? Why not just diode isolate the two batteries for charging purposes? Diodes are a few dollars each, the echo device is ~$100.00.
The Echo Charge is a good choice as it will not allow overcharging of the start battery.

The parallel switch, as you say, should not be used to combine a discharged with a charged battery. A neighbor of mine did exactly this yesterday and his charged start battery combined with his pretty discharged house bank (8 golf carts in series/parallel) left him dead in the water.

The parallel switch allows you to charge both banks in the unlikely event of an Echo Charge (or ACR) failure.
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Re: Please critique my charging schematic

Quote:
Originally Posted by hellosailor View Post
"There is the same fault indicator that a Blue Seas breaker has - it shuts off. "
Well, yes, but we expect a breaker to be a breaker. These look like the common lighted 12-volt switches made, sold, used, by many sources. There's no way (from the picture) to tell that these are breakers, instead of the common lighted switches, is there?
They definitely are low budget breaker panels, but serviceable as far as I can tell. The description in the West Marine catalog describes them as Carling breakers. I was skeptical when my customer showed it to me last week.
The 6 breaker panel is only $49.

I really prefer Blue Seas panels. But their 6 breaker DC panel is around $200
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Re: Please critique my charging schematic

Quote:
Originally Posted by eherlihy View Post
Here - in living color - are the ABYC Color Code recommendations;

You CAN vary from this, as long as it is documented, and still be ABYC compliant.

Also, yellow is the preferred color for DC negative, so that you don't mix it up with AC hot.
I don't think many follow this though - I've never been on a boat with it as far as I can remember.

I'm just happy when they have used red for positive and black for negative - it seems many don't go that far.
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Old 05-01-2012
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Re: Please critique my charging schematic

or, it allows me to start off the house bank by switching the ON/OFF to OFF and the 1/2/BOTH/OFF switch to BOTH!
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Re: Please critique my charging schematic

Quote:
Originally Posted by sfbaysailing View Post
or, it allows me to start off the house bank by switching the ON/OFF to OFF and the 1/2/BOTH/OFF switch to BOTH!
Yes it does.

I have 2 separate switches - one for start and one for house - without a crossover option. Maine's solution allows for that.
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