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Old 07-01-2011, 09:18 PM   #11
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I'm thinking some kind of electronic safety mechanism in the converter/charger. Maybe it sees a flat battery as a dead short?
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Old 07-01-2011, 09:49 PM   #12
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All I know is everything works on shore power using a WFCO power center with NO battery in it.

A dead battery (zero volts) won't take a charge without desulphation (thus the 4 stage charger) since there are no free ions in the electrolyte. It "should" act like its not there, not a dead short.
I did only get a C+ in Physics though...
Maybe someone here got an "A"?
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Old 07-01-2011, 10:15 PM   #13
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LOL, it wasn't me! That was just a wild guess.
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Old 07-05-2011, 02:23 AM   #14
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Thanks to all!

Thanks to all who replied. Just got back from our first trip with the unit. Boondocking in National Forest, Battery lasted all weekend ( 3 nights - 2 Days). Furnace was needed some all 3 nights. Really appreciate the advice about the battery as it meant getting out what I'm sure was at least one day sooner.
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Old 07-08-2011, 09:00 PM   #15
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I had the same issue in my 07 Flagstaff. Brought it home from storage with dead battery plugged into shore power and nada. I was pretty confused until I hooked it back up to my running truck and everything came on. Until the battery was showing a charge I had no 12V in the camper.
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Old 07-08-2011, 09:20 PM   #16
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Maybe a dead battery pulls so much amps initially out of the converter that it trips off line. That would explain the "no 12VDC" in the camper until the battery voltage rises to a point that the current demand from the converter is in its "safe range."
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Old 07-08-2011, 09:30 PM   #17
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So a dead battery is not the same as no battery to the converter. A dead battery and no battery both show no voltage, so it must be related to measured resistance. It would be interesting to know how it detects that condition and why it's designed to shut down when it does.
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Old 07-08-2011, 09:54 PM   #18
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Tomorrow I will log on to the WFCO site and ask by contact email.
I will let you know if and/or when I get a reply.
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Old 07-09-2011, 09:52 AM   #19
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ok, i can see the 12 volt being dragged down by a internally shorted battery; can't see it dragging down the 110.
Gens1, were u plugged into shore power at any time while u were camping?
after u charged ur battery and still plugged into shore power, did ur 110V start working? if not, u still may have a problem.
the adapter suggestion is a likely one (assuming no 110V).
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Old 07-09-2011, 11:42 AM   #20
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Once the battery had what had to be a very minimal charge(10-15 minutes on battery charger on my lunch hour), It was rehooked to system and the entire system, including 110 (ac, Microwave), came back to life and battery was then charged only through the converter. Battery lasted all weekend from only about 6hrs on shore power after unhooking and before we left for the weekend Fri. evening.

I also am puzzled as to why the battery needed to have any charge in order for the 110 to function, That is why my original question was "where I may look for a "Master Power Switch" that I thought I must have been overlooking.
Anyway, All is well now and I know for future if Battery is completely dischaged that I will use another chargiing source to "prime the system". Again Thanks to all for the help and discussion
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