When hooked to shore power, the fan in the fuse/breaker box immediately comes on and remains on. Is this normal?

Yes..how much it runs depends on which brand and model converter/charger is installed, and the condition of your batteriesThe converter, located behind the fuses, makes the DC power used to charge your batteries and supply ALL your 12v needs (lights, water pump, control power for fridge etc..) while you are plugged into shore power at the campground

Not typical.But if the battery is really low voltage, then it could be happening.I normally do not have the fan on my inverter/charger run at all, because I charge from the solar panels, and the shore charger does not run very often. Do you keep the RV plugged in all the time? Or is it stored someplace where the battery can get low. If the battery is say 11.5 volts or less, then the charger will work at full capacity for a couple of hours, heat up and turn on the fan.Also check the battery water level. If the level is really low on one of the cells, then it might be shorted, and you might have a not charged reading of say 10.2 volts. This will also cause the charger to run at 100% for a time, and turn on the fan.If it is low on water, only add distilled water to the battery, and might as well unplug the RV to stop the battery from overheating before it is fixed. Fred.

Mine runs all the time and the more lights I turn on the louder it gets.

Thanks guys. The TT is brand new and I've plugged it in here and there at home for the past week. Today its had the opportunity to be plugged in the longest its ever been (at least since I've had it). I just went out and unplugged it after 6-7 hours and the fan was not running. Does that mean the inverter finished charging the battery? I've been meaning to disconnect the battery and put a trickle charge on it. Its brand new, but that doesn't mean anything.

Tacswa3 wrote:Thanks guys. The TT is brand new and I've plugged it in here and there at home for the past week. Today its had the opportunity to be plugged in the longest its ever been (at least since I've had it). I just went out and unplugged it after 6-7 hours and the fan was not running. Does that mean the inverter finished charging the battery? I've been meaning to disconnect the battery and put a trickle charge on it. Its brand new, but that doesn't mean anything.When plugged into shore power the 'converter' will supply the 12V DC and charge the battery.The fan runs to cool off converter due to heat produced....especially when charging batteryOnly need to 'trickle charge battery if you are going to be unplugged for extended period.........several weeks.Check the battery voltage and check water levels in battery.

Fan in fuse panel constantly running... | Good Sam Community

Tachdriver
Explorer
May 13, 2014
It will be on my de-winterization checklist next time!
Clay_L
Explorer
May 12, 2014
Tachdriver wrote:
Weird phenomenon.

My converter fan last fall started running louder with lower loads. Made me scratch my head.

I took the panel off and there is a screen with millions of holes, I cleaned it up really well and reinstalled.

Now the fan runs slower and less.

True and weird.

Don't know what converter I have....yet.

Give yours a good cleaning.

I found that I had to clean the input and output screen every few years. Pet hair, lint and dust really clogged them up.
Tachdriver
Explorer
May 11, 2014
Weird phenomenon.

My converter fan last fall started running louder with lower loads. Made me scratch my head.

I took the panel off and there is a screen with millions of holes, I cleaned it up really well and reinstalled.

Now the fan runs slower and less.

True and weird.

Don't know what converter I have....yet.

Give yours a good cleaning.
westend
Explorer
May 10, 2014
Tacswa3 wrote:
2112 wrote:
Tacswa3 wrote:
Thanks guys... I just went out and unplugged it after 6-7 hours and the fan was not running...
It was not running before or after you unplugged it?

No, the fan stopped running before I unplugged. No telling when it stopped. I went to unplug shore power after several hours and noticed it stopped.
OK. and now you're at the question booth again, "Is my battery fully charged?" or "Is my converter working properly?". Get a meter so you know the state of your 12V system. If you've never used one and are terrified with new things, buy an inexpensive 12V panel mount meter and attach to your battery terminals or get a meter that will plug into the standard 12V cigar lighter outlet.

Without being able to measure voltage, you will be constantly buying tickets for the question booth.
2112
Explorer II
May 10, 2014
Tacswa3 wrote:
2112 wrote:
Tacswa3 wrote:
Thanks guys... I just went out and unplugged it after 6-7 hours and the fan was not running...
It was not running before or after you unplugged it?

No, the fan stopped running before I unplugged. No telling when it stopped. I went to unplug shore power after several hours and noticed it stopped.
Your battery was low.
It's all good.

Preventing from wiping out a battery in 12 months is half the fun of RV ownership :)
Enjoy
Tacswa3
Explorer
May 10, 2014
2112 wrote:
Tacswa3 wrote:
Thanks guys... I just went out and unplugged it after 6-7 hours and the fan was not running...
It was not running before or after you unplugged it?

No, the fan stopped running before I unplugged. No telling when it stopped. I went to unplug shore power after several hours and noticed it stopped.
dodge_guy
Explorer II
May 10, 2014
A fully charged battery should not have the fan run 100% of the time. mine runs on low when I have more than 4 (2 bulb housings) on, my light switch at the door turns on 4 housings. as soon as I switch on the 5th the converter fan runs on low and builds up speed with each additional load. with a new battery it should not run with a small load on it.

As 2112 stated, I have a small solar trickle charger I use for when the trailer is in storage.
2112
Explorer II
May 10, 2014
Tacswa3 wrote:
Thanks guys... I just went out and unplugged it after 6-7 hours and the fan was not running...
It was not running before or after you unplugged it?

If not running while plugged it >> All good, battery finally took a full charge.
If not running after unplugged >> It wouldn't run when unplugged.

If it's plugged in for day's and the fan is still running on high there may be a temperature sensor failure.

FWIW, mine is load dependent. Light DC load, no fan. The fan speed increases when load increases and decreases when load decreases.

TIP: When storing unplugged for more than a day either turn off the battery connection or remove it and place on maintenance charge. The parasitic loads of the camper (CO detector, radio clock, etc) will kill a battery.

Enjoy and Happy Camping
Shadow_Catcher
Explorer
May 10, 2014
WFCO and other China made converters fans I have heard seem to run continuously, the fan on my Progressive Dynamics only very occasionally. I think this is a sign they are malfunctioning, or installed with not enough ventilation.
I have seen discussions that many/most WFCO converters never worked correctly i.e. not going into boost or coming out of it.
Shadow_Catcher
Explorer
May 10, 2014
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