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Old 22-03-2018, 12:58   #46
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Re: Different current from house bank batteries

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Originally Posted by ZULU40 View Post
Its definitely more complicated for fout batteries. I have three batteries too, and Im presently fitting a xantrex charger to the boat.

I had been considering either just connecting the centre battery (two) or the next positive and the next negative on batteries one and three, but now Im not so sure.
Why make something simple complicated. Three or four batteries. Once paralleled they become one larger battery. Tap off or charge any place you want.
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Old 22-03-2018, 13:14   #47
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Re: Different current from house bank batteries

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Thanks all, I have disconnected the middle battery. I still need testing but morning voltages are now higher. I only have one more month to survive which will be ok with the reduced Ah, before putting the boat on the hard for 6 months. Will replace all when I get back
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Old 22-03-2018, 13:15   #48
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Re: Different current from house bank batteries

You can also take a IR pyrometer and measure the temp on each of the terminals of the Batteries both under load and under charge (at a large enough amperage of course).

The idea is that any resistance in the connectors, posts etc will show up as a temp difference (before and after measurement).

Even simple mistakes like using a stainless washer and stacking it close to the battery will introduce a significant resistance and localized heating.

I once has a perfectly good looking lug crimped to some 2/0 which under 100 amps charge became too hot to touch. Bad crimp.

Just another tool for your quiver.


You can get a cheap IR pyrometer for $20 or so.
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Old 22-03-2018, 13:18   #49
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Re: Different current from house bank batteries

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Why make something simple complicated. Three or four batteries. Once paralleled they become one larger battery. Tap off or charge any place you want.

my views are not extraordinary but differ
batteries in themselves have resistance

my best advice, find a fight someplace else
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Old 22-03-2018, 13:42   #50
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Re: Different current from house bank batteries

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Originally Posted by ZULU40 View Post
my views are not extraordinary but differ
batteries in themselves have resistance

my best advice, find a fight someplace else
Fight? You said not to sure. Batteries are just big capacitors. Resistance?
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Old 22-03-2018, 18:32   #51
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Re: Different current from house bank batteries

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Originally Posted by jlcnuke View Post
Updated link to make it an image.
That is a correct installation drawing. Positive connection on one end of the bank, negative on the other end. That configuration assures each battery in the bank is charged and discharged equally.
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Old 23-03-2018, 03:36   #52
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Re: Different current from house bank batteries

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Originally Posted by Cpt Pat View Post
That is a correct installation drawing. Positive connection on one end of the bank, negative on the other end. That configuration assures each battery in the bank is charged and discharged equally.
Nope ...

Let's take the example of 4 batteries. With this classical setup batt 1 & 4 are connected to the loads/charges with 3 cables carrying 1/4, 1/2, 3/4 of total current (in theory), while batt 2 & 3 are connected to the loads with 1 cable carrying 1/2 and 2 cables carrying 3/4 of total current. So 3 cables per battery, right, but with different characteristics.

If you care to have a look at the Smartguage link posted here you will see you can have all 4 batteries connected to the loads with only 2 cables: 1 carrying 1/4 and 1 carrying 1/2 of total current. Much better isn't it ?
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Old 23-03-2018, 05:54   #53
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Re: Different current from house bank batteries

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Originally Posted by rom View Post
Nope ...

Let's take the example of 4 batteries. With this classical setup batt 1 & 4 are connected to the loads/charges with 3 cables carrying 1/4, 1/2, 3/4 of total current (in theory), while batt 2 & 3 are connected to the loads with 1 cable carrying 1/2 and 2 cables carrying 3/4 of total current. So 3 cables per battery, right, but with different characteristics.

If you care to have a look at the Smartguage link posted here you will see you can have all 4 batteries connected to the loads with only 2 cables: 1 carrying 1/4 and 1 carrying 1/2 of total current. Much better isn't it ?
If you are referencing post #5 in this thread, that is a correct way to connect 4 batteries. All 4 batteries are the same 'wire distance' from the load and/or charging source.
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Old 23-03-2018, 12:14   #54
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Re: Different current from house bank batteries

That's from MaineSail.

But Gibbo's a pretty smart cookie bout this stuff too 8-)
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Old 24-03-2018, 02:19   #55
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Re: Different current from house bank batteries

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Originally Posted by DotDun View Post
If you are referencing post #5 in this thread, that is a correct way to connect 4 batteries. All 4 batteries are the same 'wire distance' from the load and/or charging source.
Yes but this is not the only parameter to be considered for proper balance. Of course it would help the discussion if you had a look at SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank
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