| Fan-Tastic Roof Fan - Parasitic Load [message #356193] |
Sun, 28 June 2020 12:55  |
Clark76
Messages: 62
Registered: February 2010
Karma: -2
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The previous owner installed a Fan-Tastic Roof Fan. It is the automatic version that also has a remote control and will run at set temperatures. It will pull air in or exhaust and open/close the vent door.
It is located on the #1 12V DC 12 Amp. Fused Coach House Circuit. This circuit also includes the driver side ceiling pair of lights above the sofa and the Left Galley Lamp. http://www.bdub.net/wirediagrams/75-76-12vdc-living-area.pdf
I noticed that it has a parasitic load when all loads are off. It makes sense since it can be remote controlled with a wireless transmitter.
Question: The parasitic load I see is .05 Amps. This seems high for this type of service.
What parasitic load should I expect?
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| Re: [GMCnet] Fan-Tastic Roof Fan - Parasitic Load [message #356201 is a reply to message #356199] |
Sun, 28 June 2020 17:31  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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This is another one of those "what the heck are y'all talking about?"
topics. I never got an email with whatever posting stimulated that reply.
:-(
Ken H.
On Sun, Jun 28, 2020 at 6:21 PM Tom Lins via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Send an email to the support people at Fantastic Vent, they are usually
> very helpful.
>
>
> --
> Tom Lins
> St Augustine, FL
> 77 GM Rear Twin, Dry Bath, 455, Aluminum Radiator Quad-Bag Suspension
> Solar Panel
> Manuals on DVD
> GMC Dealer Training Tapes
> http://www.bdub.net/tomlins/
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Fan-Tastic Roof Fan - Parasitic Load [message #356202 is a reply to message #356201] |
Sun, 28 June 2020 18:22 |
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Tom Lins
Messages: 372
Registered: February 2004
Location: St Augustine, FL
Karma: 1
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Ken Henderson wrote on Sun, 28 June 2020 18:31This is another one of those "what the heck are y'all talking about?"
topics. I never got an email with whatever posting stimulated that reply.
Ken H.
On Sun, Jun 28, 2020 at 6:21 PM Tom Lins via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Send an email to the support people at Fantastic Vent, they are usually
> very helpful.
>
>
> --
> Tom Lins
> St Augustine, FL
> 77 GM Rear Twin, Dry Bath, 455, Aluminum Radiator Quad-Bag Suspension
> Solar Panel
> Manuals on DVD
> GMC Dealer Training Tapes
> http://www.bdub.net/tomlins/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Sorry Ken
I should have quoted the original post.
Evidently Clark76 only signed up for the Forum and not the mailing list.
When that happens the mailing list people don't see the post and come to think of it the messages from those people do not go in the google groups archive either.
Here is the original message:
"The previous owner installed a Fan-Tastic Roof Fan. It is the automatic version that also has a remote control and will run at set temperatures. It will pull air in or exhaust and open/close the vent door.
It is located on the #1 12V DC 12 Amp. Fused Coach House Circuit. This circuit also includes the driver side ceiling pair of lights above the sofa and the Left Galley Lamp. http://www.bdub.net/wirediagrams/75-76-12vdc-living-area.pdf
I noticed that it has a parasitic load when all loads are off. It makes sense since it can be remote controlled with a wireless transmitter.
Question: The parasitic load I see is .05 Amps. This seems high for this type of service.
What parasitic load should I expect? "
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, Aluminum Radiator Quad-Bag Suspension Solar Panel
Manuals on DVD
YOUTUBE Channel: GMC Dealer Training Tapes
http://www.bdub.net/tomlins/
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| Re: Fan-Tastic Roof Fan - Parasitic Load [message #356240 is a reply to message #356193] |
Mon, 29 June 2020 17:57 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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You are sure that the 50 mils is the fan alone, not a combination of other stuff on the line?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Fan-Tastic Roof Fan - Parasitic Load [message #356247 is a reply to message #356193] |
Mon, 29 June 2020 21:26 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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0.05Amp x 24hrs = 1.2AmpHr per day so it does add up.
I remember when digital tuned and display car radios came out in about 1976 or so, they drew about 200mA and would "kill" a car battery over the weekend. We only sold a few before the Boss pulled them from the shelf. Too many customer issues!
I was a commerical two-way radio (Police, Fire, taxi) Dealer for 40 years. When microprocessor base radios came out, they would draw over 1/2 Amp on standby and about 200mA when turned "OFF". So we designed a power-down timer that would leave the radio ON for a programmable time (default was 4 hours)after the engine was shut off, then kill the power to the battery. The time was long enough that it would stay on all day in a vehicle, but would shut off by 9pm. It also monitored the battery voltage and ambient temperature so the engine could always be started.
http://www.gmcmhphotos.com/photos/electrical/p28712-12-volt-accessory-power-down-timer.html
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: Fan-Tastic Roof Fan - Parasitic Load [message #356253 is a reply to message #356246] |
Tue, 30 June 2020 00:46 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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A few years back the GM corporate design point was all new vehicles must draw less the .020 (20ma.) after the body computer goes to sleep and the vehicle must start (battery size) after being parked for 28 or 30 days.
At the time I got this info I was killing batteries on my Colroado. My Colorado now draws .018 (18Ma.) after the computer goes to sleep.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Fan-Tastic Roof Fan - Parasitic Load [message #356257 is a reply to message #356193] |
Tue, 30 June 2020 07:23 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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You might reqire the fan switch to turn off the incoming power, and jump the contacts it now goes to. This would disable the remote when it was 'off' though.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Fan-Tastic Roof Fan - Parasitic Load [message #356260 is a reply to message #356193] |
Tue, 30 June 2020 08:15 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Can you just mount a switch on or at the fan or in the fuse area? True OFF. Should not be a problem when using the MH. Obviously the Fan radio RXR needs to be on to listen for the remote. I’m so old school I have no parasites. Problem is those L o n g slow drains to flat really put the hurt on flooded batteries. Best to bring them back slowly at like 2A or less IMHO.
John Lebetski
Woodstock, IL
77 Eleganza II
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