Home » Public Forums » GMCnet » Battery maintainer
| Battery maintainer [message #137583] |
Fri, 05 August 2011 10:49  |
Wander Inn
Messages: 100
Registered: January 2010
Location: Phoenix Az.
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If I hook my battery maintainter to the battery isolater,
will this maintain both battery systems?
Mike
Mike & Chris Hughes
1977 Kingsley
Phoenix, Az.
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| Re: Battery maintainer [message #137585 is a reply to message #137583] |
Fri, 05 August 2011 11:21  |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
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| Wander Inn wrote on Fri, 05 August 2011 08:49 |
If I hook my battery maintainter to the battery isolater,
will this maintain both battery systems?
Mike
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Probably not, the voltage of a maintainer is quite low, and the voltage drop of the isolator would not let it "maintain" the batteries. However, two of them (the HF ones are very cheap) would do the job, attached to the two outside posts of the isolator, but not the center, which goes to the alternator.
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] Battery maintainer [message #138225 is a reply to message #137978] |
Wed, 10 August 2011 05:10 |
PETEinLongBeach
Messages: 90
Registered: June 2007
Location: Long Beach, CA
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| Mr ERFisher wrote on Mon, 08 August 2011 02:31 |
yes that does work, but the voltage delivered will be about 1/2 volt low
because of the voltage drop of the isolator.
this drop does not happen with the alternator because the alternator has a
voltage sense line and corrects for the voltage drop.
a better way to connect this , maintainer, would be to install a combiner,
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Yes, that would be better if I needed significant re-charging. But, all I'm using this for is minimal charge maintenance, and the connection through the isolator appears to be doing that sufficiently so far...
If I needed a deeper & faster charge, I would just clip on a regular battery charger directly to the desired bank, but so far I haven't needed to do that.
Pete Smay
Long Beach, CA
1977 Kingsley
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| Re: [GMCnet] Battery maintainer [message #138227 is a reply to message #138225] |
Wed, 10 August 2011 06:14 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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I think you are missing Gene's point.
Normally a battery maintainer runs around 13.2 or 13.4 volts to maintain a battery. There is a .5 to .7 volt drop through the isolator. This mean the battery is only seeing 12.5 to 12.9 volts from the maintainer. That is not enough to keep the battery fully charged.
If you connect the maintainer to one of the other terminals of the isolator you will be bypassing the isolator and the associated drop.
Now if that item is really a battery charger then it's output is probably 13.8 to 14.0 volts. Then the .7 volt drop through the isolator is a good thing.
I would throw a volt meter on the battery side and see what voltage you are really getting to the battery.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Battery maintainer [message #138244 is a reply to message #138225] |
Wed, 10 August 2011 10:14 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Assuming that the combiner and isolator are operating
correctly (even if not) wouldn't it be a good idea to
hook up an indivicual "minder" or "tender" directly to
each of the battery "banks?" Since those operate on
"shore" power and could function when the coach was
idle, you should obtain well maintained battery banks.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~~ ~ ~ (TZE166V101966) ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> To: gmclist@temp.gmcnet.org
> From: peteinlb@aol.com
> Date: Wed, 10 Aug 2011 05:10:19 -0500
> Subject: Re: [GMCnet] Battery maintainer
>
>
>
> Mr ERFisher wrote on Mon, 08 August 2011 02:31
> > yes that does work, but the voltage delivered will be about 1/2 volt low
> > because of the voltage drop of the isolator.
> >
> > this drop does not happen with the alternator because the alternator has a
> > voltage sense line and corrects for the voltage drop.
> >
> > a better way to connect this , maintainer, would be to install a combiner,
>
>
> Yes, that would be better if I needed significant re-charging. But, all I'm using this for is minimal charge maintenance, and the connection through the isolator appears to be doing that sufficiently so far...
>
> If I needed a deeper & faster charge, I would just clip on a regular battery charger directly to the desired bank, but so far I haven't needed to do that.
> --
> Pete Smay
> Long Beach, CA
> 1977 Kingsley
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| Re: [GMCnet] Battery maintainer [message #138372 is a reply to message #138244] |
Wed, 10 August 2011 23:14 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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wouldn't it be a good idea to
> hook up an individual "minder" or "tender" directly to
> each of the battery "banks?"
not necessary, the combiner will connect all the banks together
gene
Since those operate on
> "shore" power and could function when the coach was
> idle, you should obtain well maintained battery banks.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~~ ~ ~ (TZE166V101966) ~ ~ ~~
> ~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>
>
>
>> To: gmclist@temp.gmcnet.org
>> From: peteinlb@aol.com
>> Date: Wed, 10 Aug 2011 05:10:19 -0500
>> Subject: Re: [GMCnet] Battery maintainer
>>
>>
>>
>> Mr ERFisher wrote on Mon, 08 August 2011 02:31
>> > yes that does work, but the voltage delivered will be about 1/2 volt low
>> > because of the voltage drop of the isolator.
>> >
>> > this drop does not happen with the alternator because the alternator has a
>> > voltage sense line and corrects for the voltage drop.
>> >
>> > a better way to connect this , maintainer, would be to install a combiner,
>>
>>
>> Yes, that would be better if I needed significant re-charging. But, all I'm using this for is minimal charge maintenance, and the connection through the isolator appears to be doing that sufficiently so far...
>>
>> If I needed a deeper & faster charge, I would just clip on a regular battery charger directly to the desired bank, but so far I haven't needed to do that.
>> --
>> Pete Smay
>> Long Beach, CA
>> 1977 Kingsley
>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and -------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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