Home » Public Forums » GMCnet » Isolater vs Alternator (My experience)
| Re: [GMCnet] Isolater vs Alternator [message #326645 is a reply to message #326641] |
Sat, 02 December 2017 11:48   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Emery,
Wben installing the combiner, the chassis battery should be connected
directly to the sense wire. Since the combiner only closes when it senses
charge-capable voltage (~13.8 VDC), the sense line would not be connected
to the house battery if the alternator was too weak to achieve that
voltage. So, no, the combiner would not "hide" a weak chassis battery.
Can't necessarily say the same about a house battery though: There is a
condition in which the combiner could be detrimental: A defective house
battery could pull the alternator below charge voltage while the combiner
was closed, even with the sense line attempting to hold the voltage up.
The combiner would drop out after a preset delay (30 sec., IIRC). With the
excess load removed, the alternator would again achieve charge voltage,
closing the combiner, and again attempting to charge the weak battery. So,
the combiner could conceivable subject the alternator to cyclic full
loading and even over-stress.
Seems like there ain't nuthin' perfect!
Ken H.
On Sat, Dec 2, 2017 at 12:21 PM, Emery Stora wrote:
> But Ken —
>
> Even with an isolator "the chassis battery is always connected to the
> voltage sense line to the alternator”.
>
> I would think that if you have a combiner then the voltage sense line is
> connected to both the chassis battery and the house battery which would
> then “hide” a weak chassis battery from the alternator.
> Am I not correct on this?
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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