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Old 05-27-2018, 08:08 AM   #1
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Fan in fuse box?

When we turn on some lights a fan noise starts in the fuse box, and stops when we turn the light off. Not all lights though. Anyone know what this could be? 2006 ROO 23SS
Thanks!
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Old 05-27-2018, 08:19 AM   #2
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cooling fan for converter / charger. when you turn the lights on you are using 12 volt dc power. the converter / charger converts 110 volt ac power to 12 volt dc power. your batteries can also supply 12 volt dc power. but in either case the converter / charger fires up to supply 12 volt dc power to run the lights and/or recharge the batteries. the fan turns on to cool it as it is supplying this power.
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Old 05-27-2018, 02:16 PM   #3
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As was said, converter fan.
Most common cause is weak/low/bad battery.
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Old 05-27-2018, 02:20 PM   #4
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X2 what bikendan said
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Old 05-27-2018, 02:22 PM   #5
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Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
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Old 05-27-2018, 02:24 PM   #6
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Quote:
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Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
I had a 2007 23SS and I never plugged my Roo into shore power without the battery.
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Old 05-27-2018, 02:29 PM   #7
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Thanks for the help!
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Old 05-27-2018, 02:31 PM   #8
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Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
Yes, the battery should always be connected in order to extend the life of the voltage converter.

Rapid surges in 12 volt demand (like opening a slide or turning on the furnace) are first supplied by the battery as the converter ramps up to provide that demand.

Without a battery in the circuit, the converter is the sole supplier of DC voltage and current for your devices. Rapid changes in demand can be supplied by the converter, but voltage will vary until the converter catches up with the load.

The cooling fan will run anytime the bridge recifiers (that do the conversion from AC to DC) get hot. Without a battery that pretty much happens immediately.

With a battery to initially supply heavy loads and moderate voltage transients, the life of the converter (and your DC motors) is extended.
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Old 05-27-2018, 02:48 PM   #9
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Yes, the battery should always be connected in order to extend the life of the voltage converter.

Rapid surges in 12 volt demand (like opening a slide or turning on the furnace) are first supplied by the battery as the converter ramps up to provide that demand.

Without a battery in the circuit, the converter is the sole supplier of DC voltage and current for your devices. Rapid changes in demand can be supplied by the converter, but voltage will vary until the converter catches up with the load.

The cooling fan will run anytime the bridge recifiers (that do the conversion from AC to DC) get hot. Without a battery that pretty much happens immediately.

With a battery to initially supply heavy loads and moderate voltage transients, the life of the converter (and your DC motors) is extended.
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Old 05-27-2018, 02:52 PM   #10
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i had a query into a converter manufacturer asking why all the different models of the converters with different amperage capacities and how it was determined which capacity converter to put into the different rvs. their reply was that there is a RVIA standard that the converter must supply 1/2 of the amperage that the rv could require. the expectation was that the battery would supply power for high amperage devices and the converter would recharge the battery though time at a lower but steadier amperage.
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