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09-29-2011, 05:40 PM
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#1
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Big G
2000 19' Bambi
Paso Robles
, California
Join Date: Sep 2011
Posts: 6
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What should be the DC current load when all DC components are turned off?
I have a 2000 Bambi. It was after-market modified by the previous owner. He installed a roof-top solar charging system and an inverter/charger but didn't do much in the way of documentation. The manufacturer's schematics are a bit cryptic and may not reflect the 'as built' state. I am working on documenting and fine tuning my electrical/charging system because I have found DC current loads that are severely shortening autonomous run time.
My current question is: what should be the DC current draw when nothing is turned on? I am finding that I have a 1.3 to 1.5 amp draw when everything that can be turned off is off as far as I can tell. Tank sensors, thermostats and status displays draw a tiny amount of current. After putting an ammeter in the fuse sockets I determined that this current is going to the interior loom via the purple and brown wires which is also linked to the ceiling loom. Basically hundreds of items--nearly everything DC inside the trailer except the radio which is on a separate circuit. The inverter is turned off. My solar system is putting out 3 amps at midday in the summer time but in the course of 24 hrs. that is not enough to break even.
I have a Perko switch and a voltage regulated cut off switch, so no dead batteries, but want to minimize DC draws when not needed. What should be the base load on the DC circuit when everything is shut down? What components drain current when theoretically everything is off and how much? Is this indicative of a failed component? Not sure how to track this down inside the chassis.
Any suggestions will be appreciated.
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09-29-2011, 05:58 PM
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#2
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3 Rivet Member 
1973 31' Excella 500
Marysville
, Washington
Join Date: Apr 2008
Posts: 219
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Our Dometic Fridge by design draws a small amount of DC when it is "Off".
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09-29-2011, 06:00 PM
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#3
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Rivet Master 
Airstream Dealer
Corona
, California
Join Date: Feb 2002
Posts: 16,499
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Quote:
Originally Posted by bgmills
I have a 2000 Bambi. It was after-market modified by the previous owner. He installed a roof-top solar charging system and an inverter/charger but didn't do much in the way of documentation. The manufacturer's schematics are a bit cryptic and may not reflect the 'as built' state. I am working on documenting and fine tuning my electrical/charging system because I have found DC current loads that are severely shortening autonomous run time.
My current question is: what should be the DC current draw when nothing is turned on? I am finding that I have a 1.3 to 1.5 amp draw when everything that can be turned off is off as far as I can tell. Tank sensors, thermostats and status displays draw a tiny amount of current. After putting an ammeter in the fuse sockets I determined that this current is going to the interior loom via the purple and brown wires which is also linked to the ceiling loom. Basically hundreds of items--nearly everything DC inside the trailer except the radio which is on a separate circuit. The inverter is turned off. My solar system is putting out 3 amps at midday in the summer time but in the course of 24 hrs. that is not enough to break even.
I have a Perko switch and a voltage regulated cut off switch, so no dead batteries, but want to minimize DC draws when not needed. What should be the base load on the DC circuit when everything is shut down? What components drain current when theoretically everything is off and how much? Is this indicative of a failed component? Not sure how to track this down inside the chassis.
Any suggestions will be appreciated.
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With everything off, technically there should be zero draw.
All you can do, is isolate and more isolate, until you find where that drain is at.
Andy
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09-29-2011, 06:09 PM
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#4
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Rivet Master 
Airstream Dealer
Corona
, California
Join Date: Feb 2002
Posts: 16,499
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Quote:
Originally Posted by Inland RV Center, In
With everything off, technically there should be zero draw.
All you can do, is isolate and more isolate, until you find where that drain is at.
Andy
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I should have added, that you can also disconnect some circuits, to help you further isolate.
Andy
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09-29-2011, 06:17 PM
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#5
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Rivet Master 
2014 25' Flying Cloud
Cuddebackville
, New York
Join Date: May 2007
Posts: 3,437
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The LP detector always draws something. It stays on even in "storage" mode.
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2014 25' Flying Cloud Rear Twin
2012 Dodge Durango Hemi/AWD
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09-29-2011, 06:17 PM
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#6
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 11,151
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Fridge, propane detector and tank monitor are always drawing some current. If you have a subwoofer, it does too. You could remove all the 12 v. fuses and try each one and see what circuit(s) is (are) drawing what.
Gene
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09-29-2011, 06:17 PM
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#7
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Rivet Master 
2005 30' Classic
Burlington
, Ontario
Join Date: Sep 2008
Posts: 2,743
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I believe that the radio - unless fuses (could be two) are pulled will still draw current to retain memory, although I would think it should be milliamps.
Likewise, you most likely have a gas leak detector installed and probably wired in such a way that it cannot easily be disconnected - that too will have a small draw, I don't know how much.
Seems to me that I have read that the fridge has a small draw even when turned of, but I'm not sure if that is correct.
I'll be interested to see what other replies you get to see what else might be drawinhg current.
I have cut out knobs on the terminals of my batteries. I too find the AS wiring diagram a bit hard to follow. I was finding that even when the battery isolation switch in the trailer was turned to "off" that when I touched the battery cable to a battery, I was still getting a spark - indicating current flow - I didn't measure the current.
I don't really understand why that should be.
The main reason that I put cutout knobs on my batteries though is that I have the original parallax converter / charger which I don't think is very sophisticated. I was afraid it might overcharge my coach batteries during a long stay at am RV park when on full hookups.
So if I am at such an RV park, I disconnect my batteries after a day or two at teh park and then re-connect when we depart.
Brian
Brian.
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09-29-2011, 06:19 PM
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#8
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CLOUDSPLITTER "Tahawus"

2003 25' Classic
Zanadude Nebula
, Milky Way
Join Date: Jun 2007
Posts: 12,828
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"nearly everything DC inside the trailer except the radio which is on a separate circuit."
 Remove the radio face..... I kept forgetting to hold the off button 'til the the drn thing shut down completely. Now whenever not being used the face comes off.
Bob
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Instead of going to ’Starbucks…I make my own Coffee at home, yell out my name rong, then light a five dollar bill on🔥
"The hardest thing about Airstreaming, clearing your head and accepting how others feel it’s supposed to be done"…..
Amanamus
"Tahawus"
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09-29-2011, 06:32 PM
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#9
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Big G
2000 19' Bambi
Paso Robles
, California
Join Date: Sep 2011
Posts: 6
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How much is small?
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09-29-2011, 06:36 PM
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#10
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Big G
2000 19' Bambi
Paso Robles
, California
Join Date: Sep 2011
Posts: 6
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I'm just trying to get a sense as to whether or not this is normal before I start pulling things out of their sockets and sticking an ammeter in there. I have an induction meter but you have to get it around the wire, otherwise its cut and splice. Trying to avoid that. If 1.3-1.5 amps was normal, so be it. I don't think it can be zero because of the tank sensors, thermostats and status panel. Perhaps the LP detector and the refer. Those will be first on my list.
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09-29-2011, 06:51 PM
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#11
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Moderator

1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,614
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Here are my notes from checkin my '91 a few months back
.9 fridge normal; .4 w/o defrost,
water heater in startup .5, .25 in fault and running
Heater 6.5 fan only, 7.8 running
Radio, below measure
fantastic fan 1.82 amps runnin on low, 2.5 med, 3.4 high
2.4 kitchen sink floruesent
1.9 stove fan,
1 typical small light
1.1 bath floruesent, 7 with mirror bulbs
11 living lights on high
Your Milage may vary....
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09-30-2011, 11:48 AM
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#12
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WBCCI 8562
1975 31' Sovereign
Pelzer
, South Carolina
Join Date: Nov 2007
Posts: 225
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It is amazing how many little things contribute to the power draw, most mentioned above. One solution is to put a swtich right on the main power feed, sure you want it where the solar still charges. I changed many of my lights to
LEDs, not thrilled with them, but get light at almost no current!!!
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 Jim in Pima Az, enjoying our 1975 31 ft Airstream Sovereign
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09-30-2011, 12:37 PM
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#13
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Wise Elder
2010 30' Classic
Vintage Kin Owner
South of the river
, Minnesota
Join Date: Dec 2009
Posts: 4,133
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The parasitic drain -- due to current flow through switch contacts that are open, dirt between terminals, and that kind of thing -- shouldn't be more than around 0.1 A. If there's more than that, either something's wrong or you have some loads that are still operating. These might include the LP gas detector -- typically around 0.2 A -- the fridge, or the electronics.
Things like the CMOS memory in the radio shouldn't draw more than 0.05A or so.
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10-02-2011, 02:38 PM
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#14
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Islander
2005 28' International CCD
Deer Harbor
, ORCAS ISLAND WA
Join Date: Feb 2009
Posts: 968
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with my current mystery...i am going from say at mid day 13.0 volts to next morning 12.2....hooked to shore power and nothing being used that i possibly know of.....
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Kingfisher24
and the Four P's(Paula, Phoenix and Peabody II and Pearl)…Peabody is here…..
2013 GMC sierra denali
WBCCI 2541
4CU
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