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12-10-2016, 01:44 PM
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#1
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Battery Disconnect: Please check my work?
Gang,
I attached two battery disconnects today but I'm a newb and I have no idea if I did it right. Can you take a look at this photo and tell me what you think?
Thanks!
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12-10-2016, 02:39 PM
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#2
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Rivet Master  Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by thiel
Gang,
I attached two battery disconnects today but I'm a newb and I have no idea if I did it right. Can you take a look at this photo and tell me what you think?
Attachment 276535
Thanks! |
Both negative leads (inverter and coach DC supply) on the disconnects......looks OK to me. 
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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12-10-2016, 02:53 PM
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#3
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by lewster
Both negative leads (inverter and coach DC supply) on the disconnects......looks OK to me. |
Thanks Lewster... so when I disconnect where do I test with a voltage meter to make sure I'm good?
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12-10-2016, 03:07 PM
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#4
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,673
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I don't know that it makes any difference but the positive paralleling jumper is on the battery terminals and the negative jumper is on the disconnects. I would think you would want parallel batteries to always be connected in parallel.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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12-10-2016, 04:48 PM
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#5
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by Al and Missy
I don't know that it makes any difference but the positive paralleling jumper is on the battery terminals and the negative jumper is on the disconnects. I would think you would want parallel batteries to always be connected in parallel.
Al
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Ha! I don't know what any of that means! :-)
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12-10-2016, 06:00 PM
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#6
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Rivet Master
1969 31' Sovereign
Broken Arrow
, Oklahoma
Join Date: Jan 2003
Posts: 1,455
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Your batteries are connected in parallel so the batteries are still connected together but disconnected from the everything else. This is a good disconnect from the 12v stuff inside however, should one battery be bad it could drag the good battery down with it. To prevent this you could just disconnect the smaller black wire on the negative side on either battery and connect it back when you want to use it again..
As it is you did good no need to measure just go inside and turn on any 12v light or water pump they should not work.
__________________
Garry
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12-10-2016, 06:07 PM
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#7
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by garry
Your batteries are connected in parallel so the batteries are still connected together but disconnected from the everything else. This is a good disconnect from the 12v stuff inside however, should one battery be bad it could drag the good battery down with it. To prevent this you could just disconnect the smaller black wire on the negative side on either battery and connect it back when you want to use it again..
As it is you did good no need to measure just go inside and turn on any 12v light or water pump they should not work. |
Thanks!
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12-11-2016, 07:19 AM
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#8
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Rivet Master Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by Al and Missy
I don't know that it makes any difference but the positive paralleling jumper is on the battery terminals and the negative jumper is on the disconnects. I would think you would want parallel batteries to always be connected in parallel.
Al
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Actually, his negative parallel cable seems to be placed on the negative disconnect terminal, so when he activates the disconnects, the batteries will also be isolated from each other.
As a result, if you want to test battery voltage when disconnected, measure each battery individually (which is the only way to see the condition of each battery).
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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12-11-2016, 11:24 AM
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#9
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2 Rivet Member 
2016 23' Flying Cloud
Hillsborito
, Oregon
Join Date: Aug 2016
Posts: 68
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On a side note, what brand are those? I'm curious to know what others use ��
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12-11-2016, 12:19 PM
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#10
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by i2oadRunnei2
On a side note, what brand are those? I'm curious to know what others use ��
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Bought them on Amazon. Lowest bidder!
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12-11-2016, 12:37 PM
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#11
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,673
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Quote:
Originally Posted by lewster
Actually, his negative parallel cable seems to be placed on the negative disconnect terminal, so when he activates the disconnects, the batteries will also be isolated from each other.
As a result, if you want to test battery voltage when disconnected, measure each battery individually (which is the only way to see the condition of each battery). |
That's what I was trying to say, Lew, but I was wondering if that was desirable. Shouldn't parallel batteries always be connected in parallel to maximize the chances that their characteristics would't drift apart due to aging? I don't know which is preferred and I was hoping you would weigh in.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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12-11-2016, 12:49 PM
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#12
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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I put the trailer away today and checked the batteries after they were disconnected. One said 12.22 and the other said 12.21.
First: is that good ...or did I get batteries with lot rot? (They have been charging for days..).
Second: I'm going to check them in a week or so and let you know my real world experience with Idroba's advice.
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12-11-2016, 12:56 PM
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#13
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4 Rivet Member 
2016 27' Flying Cloud
Hartsburg
, Missouri
Join Date: Dec 2015
Posts: 465
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So if you are using a battery disconnect to get rid of parasitic loads so your batteries don't discharge, do you need a disconnect on the negative lead for the inverter or just the dc supply?
__________________
Frank & Fran
2016 27' FC FB with 600 W solar
2016 Ford F150 EcoBoost
Equalizer Hitch
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12-11-2016, 12:57 PM
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#14
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Rivet Master Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by Al and Missy
That's what I was trying to say, Lew, but I was wondering if that was desirable. Shouldn't parallel batteries always be connected in parallel to maximize the chances that their characteristics would't drift apart due to aging? I don't know which is preferred and I was hoping you would weigh in.
Al
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Not really. When I store batteries, I always isolate each electrically so that 'if' one gets a bad cell it won't pull down the other.
Lew Farber
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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12-11-2016, 01:10 PM
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#15
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Rivet Master
2016 25' Flying Cloud
Jupiter
, Florida
Join Date: Nov 2015
Posts: 1,140
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Quote:
Originally Posted by thiel
I put the trailer away today and checked the batteries after they were disconnected. One said 12.22 and the other said 12.21.
First: is that good ...or did I get batteries with lot rot? (They have been charging for days..).
Second: I'm going to check them in a week or so and let you know my real world experience with Idroba's advice.
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12.2 volts is ~60% charge. You don't want to let them discharge much more than that.
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12-11-2016, 01:55 PM
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#16
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by SeaLevel
12.2 volts is ~60% charge. You don't want to let them discharge much more than that.
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So...if they have been charging for days and are only at 12.2 ...sounds like they are just not in good shape...?
Before I used the tongue jack they were at 12.59. Not much better.
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12-11-2016, 04:18 PM
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#17
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Rivet Master Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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What are you using as s charging source???
Lew Farber
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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12-11-2016, 05:17 PM
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#18
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by lewster
What are you using as s charging source???
Lew Farber
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Just the airstream itself.
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12-11-2016, 05:49 PM
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#19
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Rivet Master Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by thiel
Just the airstream itself.
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Bad....bad....BAD!!!!
Your batteries get a continual 13.6VDC whether they need it or not, this leads to severe undercharging (many liquid cell batteries require a bulk/absorb charge of up to 14.8VDC to get FULLY CHARGED) and in some miracle IF they are fully charged, that same 13.6VDC will not allow the batteries to float, meaning that they then get OVERCHARGED! 
You need a better charger, especially if you intend to ever upgrade your batteries!!!
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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12-11-2016, 07:16 PM
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#20
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Journeyman
2016 25' International
Amherst
, Massachusetts
Join Date: Apr 2016
Posts: 956
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Quote:
Originally Posted by lewster
Bad....bad....BAD!!!!
Your batteries get a continual 13.6VDC whether they need it or not, this leads to severe undercharging (many liquid cell batteries require a bulk/absorb charge of up to 14.8VDC to get FULLY CHARGED) and in some miracle IF they are fully charged, that same 13.6VDC will not allow the batteries to float, meaning that they then get OVERCHARGED!
You need a better charger, especially if you intend to ever upgrade your batteries!!! |
Haven't gotten to it yet. Only just got the trailer in mid-November...
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