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12-09-2008, 10:05 AM
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#1
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3 Rivet Member
1959 18' "Footer"
1964 26' Overlander
birmingham
, Alabama
Join Date: Jun 2004
Posts: 128
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battery life/length of stay
I currently don't have my 64 overlander wired to use a battery. so far we've only used it at sites with electric/water hookups but am prepping it now to visit a national park which boasts no water or electric....
just curious as to what kind of duration I could expect from a fully charged battery and average use of lights, heater blower, water pump, etc.
I know the short answer is 'it depends' but I have really nothing to gage this on since I have yet to use the batt.
__________________
Doug
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12-09-2008, 10:28 AM
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#2
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Our first A/S, 63 Safari, air compressor h2o pump, w/single 27series r/v battery, about 3 days boon-dock'n with VERY limited use.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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12-09-2008, 10:35 AM
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#3
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Doug,
The heater fan uses lots of power, and so if you use furnace at all, it will really cut your battery's charge....probably discharge it in one night. The water pump also uses a lot, but it normally does not run as long as the heater blower. Next are the incandesent lights. Use them sparingly, or use florescents, or the ones that take the least amount of current are the LED lights. But, the LED replacements are expensive.
__________________
Regards,
Steve
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12-09-2008, 10:46 AM
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#4
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Rivet Master
2006 25' Safari FB SE
St. Cloud
, Minnesota
Join Date: Aug 2003
Posts: 13,280
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A definite case of your mileage may vary. Only one battery? You may be limited to one night at a time with minimal furnace use. I bring warm bedding and set the thermostat in the upper 50s to keep it from running constantly if it's real cold out.
You'll last longer if you don't use lights. We use a couple small LED lanterns when we boondock. I principally want to keep the fridge, water heater & water pump running. Your endurance would be in multiple days running just those.
You want to avoid drawing your battery below 50%. Drawing down completely wil shorten its lifetime significantly and impact capacity immediately if you discharge it completely. The easiest way to monitor is to get a compact volt-ohm meter (VOM). I got mine at Home Depot but there are many possible sources. Then use the chart Nick Crowhurst put up here in the last week - http://www.airforums.com/forums/f449...tml#post643843.
Hooking up to your running tow vehicle daily for 15-30 minutes will accomplish almost nothing for a number of reasons. We use a Honda eu2000i for dinner hour if we want more lights or use the microwave when boondocking.
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12-09-2008, 11:30 AM
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#5
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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Quote:
Originally Posted by 59er
... to visit a national park which boasts no water or electric....
just curious as to what kind of duration I could expect from a fully charged battery and average use of lights, heater blower, water pump, etc...
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This past May/June we spent a few day in the Tetons and Yellowstone with no hookups (there's a thread here somewhere...). We added a second battery to the trailer harness (again, there's a thread here somewhere of how I did it...) and used a Honda 2000 genset. We didn't skimp on usage, the heater ran a bunch and we watched Sat TV for an hour or two after quiet time. The Honda didn't charge very good using the old univolt and by the end of the week it had toasted one of the batteries. We pretty much had to recharge every day. Based on all of my calculations, I believe with my new 3 stage charger we have enough capacity to do the same thing, but recharge every other day.
The heater is my big pull...but momma had to be warm and happy
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12-09-2008, 11:36 AM
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#6
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Rivet Master
1978 31' Sovereign
Texas Airstream Harbor
, Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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Quote:
Originally Posted by SteveH
... Next are the incandesent lights. Use them sparingly, or use florescents, or the ones that take the least amount of current are the LED lights. But, the LED replacements are expensive.
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Surprisingly, most LED's DO NOT live up to the hype - as per tests and Dept. of Energy articles - reference here:
LEDs are efficient for some applications and here:
Don's Lighting Info Center!
have determined that in MOST INSTANCES Fluorescents still produce more lumens per watt.
I purchased several (relatively) high dollar LED arrays when I redid the '78 Sovereign's lighting system, and am sorely disappointed with the outcome.
Many LED's are burned out on one array, and two others do not put out nearly the lumens I had hoped for.
Best to see an actual demonstration of a light fixture before putting your money out.
They're getting better, but quality is still not consistent.
__________________
Dennis
"Suck it up, spend the bucks, do it right the first time."
WBCCI # 1113
AirForums #1737
Trailer '78 31' Sovereign
Living Large at an Airstream Park on the Largest Lake Totally Contained in Texas
Texas Airstream Harbor, Inc.
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12-09-2008, 11:37 AM
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#7
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Just my opinion, but I think if I wanted to do much boondocking in cold weather, I would get one of the propane catalitic (sp?) heaters.
If it was much below freezing, I wouldn't be there, boondocking or otherwise.
__________________
Regards,
Steve
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12-09-2008, 12:15 PM
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#8
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Rivet Master
1959 26' Overlander
Putnam
, Connecticut
Join Date: Sep 2003
Posts: 3,064
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There is also the issue of how long your water last. It's all in the end users expectations of comfort.
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12-09-2008, 01:56 PM
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#9
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3 Rivet Member
1959 18' "Footer"
1964 26' Overlander
birmingham
, Alabama
Join Date: Jun 2004
Posts: 128
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all good points.
would it do any good to use a small generator if for no other reason than to recharge the battery during the day (since there are usually quiet times at night...)?
like a small 900 to 1000 watt, 8 or 9 amp type?
__________________
Doug
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12-09-2008, 02:16 PM
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#10
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Using a generator?
We used a Yamaha 1000 with our "63", a very good "small" unit.
A two hour run usually got us through another day. When we got the Classic it was replaced with a Honda 2000 that now has a Lpg/gasoline conversion.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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12-09-2008, 02:23 PM
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#11
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3 Rivet Member
1959 18' "Footer"
1964 26' Overlander
birmingham
, Alabama
Join Date: Jun 2004
Posts: 128
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wouldn't still have the 1000 for sale by any chance?
__________________
Doug
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12-09-2008, 02:25 PM
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#12
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by 59er
wouldn't still have the 1000 for sale by any chance?
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Sorry.. we sold it with the trailer.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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12-09-2008, 04:03 PM
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#13
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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The heater is the BIG draw. One fairly cold night will kill two good batteries. We find the other loads are manageable for 2 to 4 days of careful use. Lights on only when you need them, careful water use, etc. doesn't use a lot of power. I have made it 5 days, in mild weather (no heat).
One big trick an old timer showed me was to turn off the "moisture" control on the refer. This is a heater that is intended to function something like a defrost unit in a home refer. It is very power hungry too.
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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01-17-2010, 03:47 PM
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#14
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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This is a really old thread but I'm going to post this info here.
I measured the amp draw of various items on my '91 trailer-
Here's what we have;
.9 amps for the fridge
.5 amps for the water heater
6.5A Heater fan, 7.8A heater running
1.82A for the fantastic fan running on low, 2.5 med 3.4 high
2.4A kitchen sink fluorescent
1.9A stove fan, 1A for the hood light
1.1A bath lamp on low, 7A on high
11A living area lights on high
2A outside step lights
1.5A for the small square over head reading lights (each)
Direct TV receiver 18 watts, 61watts with 13"tube type tv (6.5A on the inverter)
I'm using these values in a spreadsheet to model my usage on a simulated hourly basis and see how solar/gen/bigger batteries work before I spend the bucks.
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01-17-2010, 04:34 PM
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#15
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Rivet Master
1961 24' Tradewind
1969 29' Ambassador
1970 21' Globetrotter
Jamestown
, Tennessee
Join Date: Jul 2008
Posts: 1,783
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Quote:
Originally Posted by 87MH
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We replaced 6 of our incadescent lights with LED's this spring. Bought arrays with adapters to replace the old 1157 (or is that 1156) bulbs that are normally used.
1 Bulb draws about 1.5 amps or 18 watts.
All six of the LED lights together draw under an amp. The light is a bit whiter than I would like but the brightness is ok for reading or anything else.
Out flourescent light draw about 2 amps,
We are quite happy with everything about the LED lights except cost.
It ran about $ 30. per light.
We have found these reduce our daily useage by about 10 amp hours.
I bought mine at a hamfest but the same product is available from Visit Our QuickShop Store To Buy LED Lighting for RVs and Boats
__________________
Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
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01-17-2010, 08:18 PM
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#16
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4 Rivet Member
Currently Looking...
tallahassee
, Florida
Join Date: Sep 2008
Posts: 343
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Quote:
Originally Posted by HiHoAgRV
.9 amps for the fridge
I'm using these values in a spreadsheet to model my usage on a simulated hourly basis and see how solar/gen/bigger batteries work before I spend the bucks.
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Does this mean the fridge draws .9 amps per hour?
Thanks,
Carol
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01-17-2010, 09:09 PM
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#17
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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Quote:
Originally Posted by tallytwo1994
Does this mean the fridge draws .9 amps per hour?
Thanks,
Carol
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Yup. Mine does. 24 hours a day, 7 days a week, as long as it's on....
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01-18-2010, 04:43 AM
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#18
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Rivet Master
1961 24' Tradewind
1969 29' Ambassador
1970 21' Globetrotter
Jamestown
, Tennessee
Join Date: Jul 2008
Posts: 1,783
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Quote:
Originally Posted by HiHoAgRV
Yup. Mine does. 24 hours a day, 7 days a week, as long as it's on....
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Since I have never had a modern fridge, Have you actually measured the current? I had assumed it was smaller than that except when igniting the burner??
.9 amps continuous equals 21 amp hours per day which is a serious draw.
We typically use 30 to 40 amp hours a day without refrigerator electric load
It's the small constant load that get you.
If the actual current draw is always this high a battery would be dead in 3-4 days if you left the fridge on while parked.
__________________
Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
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01-18-2010, 06:03 AM
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#19
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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POI...there is a hi-humidity condensation switch(?) that if on, will keep the interior light illuminated 24-7. , never picked up on when reading the manuals, my bad.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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01-18-2010, 08:48 AM
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#20
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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Yes that was a measured reading. I had a digital ampmeter in the power feed line. By turning on one system at a time i could record the draw.
I'll remeasure this afternoon, the moisture switch was ON but the interior light wasn't on. The Door switch sticks and I seem to recall the light was off when I opened it.
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