Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
how long to kill a battery with fridge fan and 3w led light
Forum Index -> Vanagon Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
bdcain
Samba Member


Joined: April 16, 2013
Posts: 306
Location: Canada
bdcain is offline 

PostPosted: Fri Jul 19, 2013 7:52 pm    Post subject: how long to kill a battery with fridge fan and 3w led light Reply with quote

hey now dont have a second batt(yet)
and when getting the fridge pre chilled on ac the fan comes on
its a muffin fan .25 amps
how much nrg will fan suck over a 24 hour period?
have a brand new 650 cold crank amp battery
also have 3watt led light bar
_________________
It looks just like a telefunken u-47
Back to top
View user's profile Send private message Gallery Classifieds Feedback
jackbombay
Samba Member


Joined: October 19, 2007
Posts: 2721
Location: Eastern Idaho
jackbombay is offline 

PostPosted: Fri Jul 19, 2013 8:15 pm    Post subject: Re: how long to kill a battery with fridge fan and 3w led li Reply with quote

bdcain wrote:
hey now dont have a second batt(yet)
and when getting the fridge pre chilled on ac the fan comes on
its a muffin fan .25 amps
how much nrg will fan suck over a 24 hour period?
have a brand new 650 cold crank amp battery
also have 3watt led light bar


Cold cranking amps are not important, you need to know the amp hour (AH) capacity of the battery, its likely around 80AH, you don't want to drop below %50 charge so you can use 40 AH IF it is a deep cycle battery, but it probably isn't so you shouldn't use more than 20 AH, if that, automotive batteries aren't really designed to get discharged any notable amount.

.25 amps for 24 hours is 6 AH, the dometic fridge pulls about 9 amps, so you really shouldn't use it on 12v because the amp draw is pretty excessive.
_________________

Gas struts to pop your top easily!

Pop Top strut kits now available for late Bay window Westies Smile


Samba ad here.


DIY artificial rain gutters (ARGs)
Back to top
View user's profile Send private message Classifieds Feedback
bdcain
Samba Member


Joined: April 16, 2013
Posts: 306
Location: Canada
bdcain is offline 

PostPosted: Fri Jul 19, 2013 8:34 pm    Post subject: Reply with quote

fridge will be on ac or propane
the fan comes on and draws 12v
i hope the fan would not run constantly
i have a second 12v fan back there that will run off of dc from ac transformer
which is ok for ac
but will only have propane with no ac while camping
thats why i asked
all's good as my wife now see's the need for a second battery system Very Happy
_________________
It looks just like a telefunken u-47
Back to top
View user's profile Send private message Gallery Classifieds Feedback
jackbombay
Samba Member


Joined: October 19, 2007
Posts: 2721
Location: Eastern Idaho
jackbombay is offline 

PostPosted: Sat Jul 20, 2013 7:41 am    Post subject: Reply with quote

bdcain wrote:

all's good as my wife now see's the need for a second battery system Very Happy


Sweet, it really is the way to go.

As for the 3 watt LED, it also pulls .25 amps.
_________________

Gas struts to pop your top easily!

Pop Top strut kits now available for late Bay window Westies Smile


Samba ad here.


DIY artificial rain gutters (ARGs)
Back to top
View user's profile Send private message Classifieds Feedback
nocreditnodebt
Samba Member


Joined: September 28, 2012
Posts: 314
Location: Socal
nocreditnodebt is offline 

PostPosted: Sat Jul 20, 2013 8:30 am    Post subject: Reply with quote

.25 amps is a lot for a muffin fan.

Here is one which uses 0.05 amps and moves 54 CFM very quietly:
http://www.noctua.at/main.php?show=productview&products_id=42&lng=en

I also had some fans claim higher consumption, like .25 amps, and found that was just the start up surge current and they settled back to .11 amps once at speed.

If you can access one of the fan's wires without too much effort and have a digital multimeter, you can check the true current draw easy enough.
Back to top
View user's profile Send private message Classifieds Feedback
MarkWard
Samba Member


Joined: February 09, 2005
Posts: 12958
Location: Palm Beach County, Florida
MarkWard is offline 

PostPosted: Mon Jul 22, 2013 7:36 am    Post subject: Reply with quote

Running the Dometic fridge on propane and an LED light should not be an issue over a 24 hour period on the cranking battery, if that is what you are asking. The Dometic Fan, probably won't even run at night and you don't use the light during the day. That said, it will end up driving you nuts. No one wants to kill their cranking battery reading a book in the evening and listening to some tunes. Best to save up for an auxilary battery and get it installed. It does not need to be a monster. Just something to run your minor camping loads and give you peice of mind.
_________________
1982 Vanagon Camper with ALH TDI.
1990 Vanagon Camper Syncro.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Royb
Samba Member


Joined: May 24, 2008
Posts: 212
Location: Sierra Foothills
Royb is offline 

PostPosted: Mon Jul 22, 2013 8:21 am    Post subject: Reply with quote

With some kind of solar, you can then recharge your battery during the day, including when the fridge fan will be running the most.
_________________
1991 Westy
Back to top
View user's profile Send private message Gallery Classifieds Feedback
PDXWesty
Samba Member


Joined: April 11, 2006
Posts: 5760
Location: Portland OR
PDXWesty is offline 

PostPosted: Mon Jul 22, 2013 8:31 am    Post subject: Reply with quote

Weekend trips shouldn't be a problem with one battery and the use you describe.

An easy way to go is get an inexpensive second car battery (walmart) and just take it with you in the van. Charge it at home with a battery charger before you go and connect it to the main battery while you are camping. I did this for a couple years before installing a full set up. You only need some 10 ga. wire with and some allagator clips to connect it when camping. That will give you the peace of mind not to worry. Set it under the van when you are at camp and run the wires in the passenger or slider door. You can actually use any 12 volt battery like a lawnmower or motorcycle battery. Every little bit helps. Just don't forget it before you go!
_________________
89 Westy 2.1 Auto
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Vanagon All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2020, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB