Fan-Tastic Roof Fan - Parasitic Load

[Tom Lins]

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/

 

[Ken H.]

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 <

> 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
>

 

[Tom Lins]

> 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 <

>
> > 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:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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
GMC Dealer Training Tapes
http://www.bdub.net/tomlins/

 

[Ken H.]

Tom,

Thanks for the background -- but you shouldn't have to provide it -- that
was the reason for my inquiry. We recently identified this registration
problem and I hoped it had been resolved. Obviously it hasn't.

Ken H.

On Sun, Jun 28, 2020 at 6:21 PM Tom Lins via Gmclist <

> Send an email to the support people at Fantastic Vent, they are usually
> very helpful.
>
>

 

[john r. lebetski]

Forum working A OK here.
50 mA is considered acceptable parasitic draw
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[johnny]

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

 

[RF_Burns]

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

 

[Ken B]

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

 

[johnny]

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

 

[RF_Burns]

Just before Christmas in 2015, we came back from a 2 week holiday to find our 5 month old GMC pickup right dead in the airport parking garage at 2am.
There were no added accessories that could drain the battery, just the stock truck. Called CAA and they sent a guy in a sub-compact car with a couple
of large truck or equipment batteries in the rear hatch for boosting.

It was so dead I had to wait a minute before my truck would crank fast enough to start. Then we had to wait another 10 minutes or so to get enough
charge built up for the electronic power steering to work.

I took it to the Dealer who load tested the battery and said all was fine. Told me about the load shedding of the electrical system.

I never had an issue with that truck battery dying after that incident. I wonder if they did a firmware update that the Dealer didn't bother to
mention.

Further to my radio experiences. We sold a line of Motorola radios that used a "Soft Switch". They consumed near an amp just ON and would kill a
battery overnight. Had customers that sweared they turned them OFF, but the vehicle battery would still die over a weekend. We suspected that as the
battery voltage dropped, the circuitry would trigger back ON and the current would increase. Our time-out timer fixed issue that so we never pursued
the cause any further.
--
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

 

[john r. lebetski]

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

 

[Ken B]

My fantastic fan (without remote but automatic rain closing) already has an off switch. Just rotate the speed knob to 0.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana