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05-27-2018, 08:08 AM
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#1
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Junior Member
Join Date: Mar 2018
Posts: 21
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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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05-27-2018, 08:19 AM
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#2
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
Posts: 3,871
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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.
__________________
2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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05-27-2018, 02:16 PM
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#3
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,780
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As was said, converter fan.
Most common cause is weak/low/bad battery.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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05-27-2018, 02:20 PM
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#4
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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X2 what bikendan said
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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05-27-2018, 02:22 PM
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#5
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Junior Member
Join Date: Mar 2018
Posts: 21
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Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
__________________
Sue
2006 Rockwood Roo 23SS
2014 Ford Expedition
High School Spanish teacher
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05-27-2018, 02:24 PM
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#6
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,780
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Quote:
Originally Posted by smalt
Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
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I had a 2007 23SS and I never plugged my Roo into shore power without the battery.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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05-27-2018, 02:29 PM
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#7
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Junior Member
Join Date: Mar 2018
Posts: 21
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Thanks for the help!
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Sue
2006 Rockwood Roo 23SS
2014 Ford Expedition
High School Spanish teacher
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05-27-2018, 02:31 PM
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#8
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by smalt
Thanks. Our battery is not connected because we are plugged in to 30 amp service, should we connect the battery?
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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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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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05-27-2018, 02:48 PM
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#9
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Senior Member
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
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Quote:
Originally Posted by Herk7769
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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yep ( I stole this)
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05-27-2018, 02:52 PM
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#10
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
Posts: 3,871
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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.
__________________
2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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05-27-2018, 03:23 PM
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#11
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by CHICKDOE
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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Yep; my understanding as well.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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05-27-2018, 04:14 PM
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#12
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Senior Member
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 17,331
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Quote:
Originally Posted by CHICKDOE
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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There's nothing wrong with installing a larger converter than what came with your unit if you have the room. Larger ones usually last longer as they don't work as hard and strain the electrical structure.
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"A wise man can change his mind. A fool never will." (Japanese Proverb)
"You only grow old when you run out of new things to do"
2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change )
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05-28-2018, 04:18 PM
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#13
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Former Navy
Join Date: Mar 2017
Location: In the U.S.A.
Posts: 39
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Leaving Batteries Connected All The Time
If you do leave your batteries connected all the time, and are connected to shore power all the time...just make sure to check the battery water level periodically. Especially in Hot Climates.
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05-29-2018, 06:09 AM
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#14
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Senior Member
Join Date: Oct 2015
Location: SW ONTARIO
Posts: 354
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Convertor cooling fan
We just acquired a gently used TT and the light over the dinette table had two automotive incandescent bulbs installed. Changed to LED- no more cooling fan, and much more efficiency.
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