[quote author=Simon3xUD link=board=1;threadid=2105;start=msg14737#msg14737 date=1089585357]
If that's the case, why do we have the option of AC as a power source on our fridge controls?[/quote]
Ac power is much more efficient as a power source for the frig. The frig will get colder faster and stay colder when on AC power.
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Is it because not all RV manufacturers have the same kind of electrical configuration (with a relay)?
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Most RV manufacturers use the same type of converter. Most of these converters isolate the battery from the 12vdc circuits when on AC power.
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Does this mean I don't have to worry about remembering to change the fridge from battery (for travel) to AC once we're hooked up to shore power?
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If you leave the frig on 112vdc power you will work the converter harder. The energy expended to convert the 110vac to 12vdc will be released as heat. The converter cooling fan will come on more often sending this heat into the TM via the vents on the front of the power center in the hallway. At some point the 12vdc circuits (lights, fans, 12vdc TV, etc.) will start loading the converter down and your frig will get even more inefficient (warmer).
MJL
