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Old 07-26-2010, 11:08 AM   #1
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Question Converter/Inverter Question

Just curious about something I noticed last week on our trip. We were plugged into shore power for the week, so we weren't dry camping.

If we had 2 of the interior lights on, there was no "whirring" noise (a fan I assume) coming from the location of the power centre. If we turned a 3rd light on or ran the water pump, the noise would begin (very low).

Is there a reason why the fan (again I'm assuming) would only come on when the load was increased? Wouldn't the converter be running when the 1st 2 lights were initially turned on?
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Old 07-26-2010, 12:34 PM   #2
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Sounds like you already answered your own question. Just two lights isn't enough of a load to create heat within the converter to activate the fan but once you added to it the fan came on. I don't believe they are on any type of timer so it would have to be from the load put on it. It may also be that the batteries were not charging originally but started once the third light was turned on.
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Old 07-26-2010, 03:28 PM   #3
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The fan is probably on a thermal switch that senses the increase in heat and turns the fan on as the load on the converter increases and thus the heat it is creating is increased. Nothing to worry about.

And just for reference:

A converter Converts 110V AC into 12VDC and charges your batteries.
An inverter converts 12VDC from batteries into 110VAC to power appliances and such.

All rigs come with a Converter. Most do not have an Inverter unless it is added as an option (when available) otherwise they are a user installed item.
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Old 07-26-2010, 03:48 PM   #4
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Thanks for the replies. I just figured that as soon as the converter was in operation, I'd hear the fan.
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