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  #21  
Old 11-19-2018, 05:43 PM
MLA MLA is offline
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Quote:
Originally Posted by lj_mastercraft View Post
I don't understand how they are in parallel when 1 or 2 is selected? Only time they would be in parallel would be when in "ALL" right?

Moot point as the switch would be in OFF, but i'm still curious. If they were in any way parallel in 1 or 2, then that would defeat the switch's purpose
You have a live 12 volt B+ path between the two batteries, through the charge Y splice you created. They are absolutely in parallel, and bypassing the switch with. Not a moot point, because its when the switch is OFF, is when that parallel comes into the play.

Prove it to yourself by disconnecting one end of the splice and testing for POS voltage. You will be measuring the other battery on a terminal that you just took off of this battery.
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  #22  
Old 11-19-2018, 06:50 PM
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This is way too confusing lol. Just hook up a 2 bank to each battery and you’re set.
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  #23  
Old 11-19-2018, 07:26 PM
LDA6339 LDA6339 is offline
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Originally Posted by MC25 View Post
This is way too confusing lol. Just hook up a 2 bank to each battery and you’re set.
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  #24  
Old 11-20-2018, 01:15 AM
lj_mastercraft lj_mastercraft is offline
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Quote:
Originally Posted by LDA6339 View Post
KISS
Keep it simple, stupid
Did you read the original post?

One of the questions I had was both banks sharing the same negative. And then the ACR for the alternator charging circuit. I don't want the banks to ever be connected to each other. Thinking about it now, one way to get around that might be to hook a single bank charger to the ACR input (the lead that runs to the alternator), and the other to the shared negative.


Quote:
Originally Posted by MLA
OFF, yes. But in 1 or 2, your batteries are technically in parallel through a wire thats 14ga at best. So drawing down one, bank, the other will want to equalize into it through your charger Y splice. Hopefully you have a fuse on each B+ charge lead right at the battery
I see what you're referring to. Yes they would be connected in parallel if using the method in picture#1 in my first post. Not in #2 though, as they would be on separate banks
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  #25  
Old 11-20-2018, 09:04 AM
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Quote:
I don't want the banks to ever be connected to each other.
Yet they are, through your charger B+ Y splice you created. Im not sure how else to explain this. Multiple people in this thread see it, yet you do not.

Unless a tech person from the charger manufacturer stated it was ok to connect the charge leads ANYWHERE else then direct to the battery posts, I would not connect it to the ACR.
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  #26  
Old 11-21-2018, 09:34 AM
88 PS190 88 PS190 is offline
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Quote:
Originally Posted by lj_mastercraft View Post
I see what you're referring to. Yes they would be connected in parallel if using the method in picture#1 in my first post. Not in #2 though, as they would be on separate banks
Fixed it.

Two options for your single bank charger that puts the batteries in isolation from each other regardless of switch position (other than both)

Option A - Diodes in the individual legs to create a backwards flow isolation on the positive terminals

Option B- two separate single bank chargers sharing a common ground and with separate positive charging leads upstream of the battery.
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  #27  
Old 11-21-2018, 10:23 AM
MLA MLA is offline
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Although on paper, a pair of diodes will address the issue, its an issue that should be undone, rather then "fixed", IMO.

As suggested on page 1, a dual bank charger or 1 charger per bank.
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  #28  
Old 11-21-2018, 10:47 AM
88 PS190 88 PS190 is offline
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Ya obviously. Im just being a dork.
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  #29  
Old 11-21-2018, 10:50 AM
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I guess I’m not getting the issue here. I have had two bank chargers on my last three boats with no issues. Both having their own neg/positive, all three having basically the same size stereos and batteries. What am I missing?
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  #30  
Old 11-25-2018, 07:38 PM
lj_mastercraft lj_mastercraft is offline
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Quote:
Originally Posted by MLA View Post
Yet they are, through your charger B+ Y splice you created. Im not sure how else to explain this. Multiple people in this thread see it, yet you do not.
You said "But in 1 or 2, your batteries are technically in parallel through a wire thats 14ga at best"

That's not true. In the #2 image I posted in the OP, of course they are. But in the #1 image, they're not. Note that the image says "DUAL BANK MAINTAINER". Meaning the charger is designed for two separate banks. There's no "splicing" taking place. Sure, it's a poorly drawn image, but that charger comes from the manufacturer with TWO sets of + and - cables. One for each bank. So that should never connect the two batteries together, as by design, they are independent.
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