Home » Public Forums » GMCnet » Isolater vs Alternator (My experience)
| Re: [GMCnet] Isolater vs Alternator [message #326648 is a reply to message #326645] |
Sat, 02 December 2017 12:14   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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K.I.S.S. is a principle that guides a philosophical mindset. Mine in
particular. While combiners may the best thing since sliced bread, they
still complicate an otherwise anvil simple system. Not much to an
alternator, a trio of conductors, and an diode isolator. Darn thing either
works, or not. Combiners, with their combinations of wires that MUST NEVER
be shortened, along with led lights that sometimes are steady, sometimes
blinking like Rudolph's nose, sometimes not at all, are a bit like
redundant components that only create more questions of their own. I will
stick with what I know.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Dec 2, 2017 9:50 AM, "Ken Henderson" wrote:
> 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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