Known Amp Ratings to Calculate Power needs

Discussion in 'Power - Site Power/Batteries/Generators/Solar' started by Agfadoc, Mar 20, 2012.

  1. Agfadoc

    Agfadoc Member

    364
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    May 4, 2009
    Green Bay, WI
    As I have been getting into solar much more than previous years, I have noticed that I have been searching all over for different amp ratings for products in our PUP's.

    I just wanted to start a thread to see what others have been finding so we can have a place to go to reference and save ourselves 15-20 minutes of our lives that could otherwise be spent camping. [:D]

    Unless someone can find a link where it all is, (I know I've seen Unstable Tripod post many times over the years, and I took some of his reference info )

    I'll start with a few items like my LED's that I have replaced in my PUP and measured through my Watts up device:

    Battery monitor devices:

    LED Battery level Display from Ebay: .004A
    http://amzn.com/B005UWD2J4
    Equus 3721 Battery and Charging System Monitor: .003A
    http://amzn.com/B000EVWDU0

    LED Lights

    Superbright LED''s:
    http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2Fspecs%2Fpcblamp.htm
    1142-PCB-CWHP9 -9 LED Cool White (Portable fans and lights). .19A
    1156-PCB-A36 - Amber Porch light .14A
    WLED-CWHP6-DAC - Roof mounted light fixtures: .156A
    http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&category=CAR&Page2Disp=%2Fspecs%2FWLED-WHP6-D.htm#photos

    Fans:

    Fantastic Fan:

    Low: 15 Watts or 1.25 amps
    Medium: 27 Watts or 2.25 amps
    High: 35 Watts or close to 3 amps
    http://amzn.com/B0000AY2Z6

    Furnace Fan: 4 amps per hour of flame time with the furnace

    Atwood Hydro-Flame Furnace 4.2 amp hours
    Suburban Furnace 4.6


    Misc Items

    On-Demand Water Pump 4.75
    Shurflo classic 2.8 4 - 7 amps
    LP and CO detectors .05 each
     
  2. Travelhoveler

    Travelhoveler New Member

    2,388
    2
    Mar 8, 2011
    Those are probably somewhat useful guides to know, though we find, in actual use, less power is used. For instance, if we tried to run a furnace for a whole hour, we'd be roasted out of the camper. We use our LED lights when doing something in the camper, but turn them off when we go outside. We pretty much just run the fan when sleeping (and turn it off after a while when it gets cooler) or cooking something.

    In real life use, we don't even worry anymore about power use. We use the furnace or fan, LED lights when needed, and charge our devices and still get at least four days of use off our Group 31 battery before it's drawn down to 65%, at which point we recharge it in a day with a small solar panel. We've discovered the AGM battery charges pretty fast compared to our previous sealed battery.
     
  3. Agfadoc

    Agfadoc Member

    364
    0
    May 4, 2009
    Green Bay, WI
    Yeah, I seem to use a bit less than I calculate, but being the type of "Paralysis of Analysis" kind of guy that I am, it is a good base to determine the power you would need when creating a solar system to meet your needs or determining if you really need a dual battery setup. With my Group 31, I debated needing more and maybe a dual battery setup, but after looking at the data, it just doesn't seem necessary for my usage.
     
  4. Travelhoveler

    Travelhoveler New Member

    2,388
    2
    Mar 8, 2011
    We also find we use lights, fan, etc. less in summer as days are longer, so we are outside longer. I'd factor that into any calculations as well.
     
  5. Unstable_Tripod

    Unstable_Tripod Well, there's your problem!

    14,372
    11
    May 20, 2008
    Seattle, Washington
    I have a list of amp draw for various common camping items but it is in the trailer (at the storage yard) right now. I will be bringing the trailer home for trip preparation toward the end of the week and I'll try to copy some of that stuff here before I leave. Travelhoveler's comments about combining the hourly amp draw figures with actual real time operation are important in estimating the real world results. I think it is also valuable to look at "peak demand" periods where you are operating several items at once.
     
  6. dschlosser

    dschlosser Active Member

    1,013
    1
    Jan 29, 2008
    East Patchogue, NY
    I just set this as a sticky for easier reference.
     
  7. Agfadoc

    Agfadoc Member

    364
    0
    May 4, 2009
    Green Bay, WI
  8. BuxCamper

    BuxCamper Member

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    Mar 29, 2003
    Bucks County, PA
    Re: Re: Known Amp Ratings to Calculate Power needs

    How small of a solar panel?
     
  9. roughin-it

    roughin-it New Member

    145
    0
    Oct 20, 2010
    Another useful tool:


    Volts = watts/amps
    Watts/Volts = amps

    There are more formulas but most people can do their own equipment with these.

    Great thread!

    Dom
     
  10. jim123

    jim123 New Member

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    Aug 23, 2011
    here ya all go , the tool for every thing.

    [​IMG]
     
  11. Agfadoc

    Agfadoc Member

    364
    0
    May 4, 2009
    Green Bay, WI
    Re: Re: Known Amp Ratings to Calculate Power needs

    Man, I've seen it an hundred different ways but never in a compact image like that, pretty cool, thanks.

    Sent from my Supercharged Asus Transformer
     
  12. jim123

    jim123 New Member

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    Aug 23, 2011
    here is some info on a LED white strip light i got off ebay the other day.
    payed $20.99 for 5 meters of lights.


    [​IMG]

    here is a link to the ebay store where i got the led strip light from
    http://stores.ebay.com/eherebuy/Other-/_i.html?_fsub=1&_sid=985707809&_trksid=p4634.c0.m322


    I hooked this up in the pup last night and blocked off all but 4 feet of the spool.
    It lit up the pup great, with just 4 feet of lights held up on the roof, you could play cards or read a book
    with no problem.

    check out the current draw of the whole 5 meters and it was 2.7 amps from my test power supply
     
  13. Unstable_Tripod

    Unstable_Tripod Well, there's your problem!

    14,372
    11
    May 20, 2008
    Seattle, Washington
    Here is a list I got from the dealer when I bought my Yuma. All number are amps drawn per hour.

    Hydroflame furnace fan 4.2
    Suburban furnace fan 4.6
    Norcold fridge 11.15
    Dometic fridge 15.5
    D.S.I Water Heater .66
    Stove or bathroom fan 1.6
    Fantastic Fan 1.9
    Power tongue jack 13
    Single fixture light 1.5
    Double fixture light 2.9
    Florescent light 2
    On demand water pump 4.75
    Stereo/CD player .05
    LP Gas detector .05
    CO detector .05
     
  14. BrianRosenthal

    BrianRosenthal Member

    55
    3
    Feb 23, 2011
    Single data point for furnace

    To help others estimate furnace use, here's a single data point.

    Jayco 10X with no mods for cold weather, in full shade (early morning)
    40F outside
    Furnace set a 60F (checked with thermometer)
    Furnace ran 13 minutes and was off for 30 minutes

    This is about a 30% duty cycle, so in similar conditions, a full 8 hour night of heating would consume:

    8 hours * 4 amps * 30% = 9.6AHr

    Obviously, your mileage may vary.

    -Brian
     
  15. rabird

    rabird Howdy!

    6,128
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    Mar 3, 2006
    TX
  16. darrenandmelissa

    darrenandmelissa Member

    292
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    Jan 16, 2009
    Winnipeg, Manitoba
  17. Wrenchgear

    Wrenchgear Near Elmira, Southern Ontario

    2,574
    112
    Aug 5, 2010
    5 Star Eagle Camper
    Jim123
    Thats awesome, I've never seen that before.

    darrenandmelissa...
    Although I don't need it in watch form at this time, my birthday is coming up in 10 short months, and if you can't think of anything to get me.....
     
  18. ChocoChock01

    ChocoChock01 On the road aagaain See Rallies below;

    4,048
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    Mar 7, 2012

    Nice!!
     
  19. ChocoChock01

    ChocoChock01 On the road aagaain See Rallies below;

    4,048
    10
    Mar 7, 2012
  20. rajphoto

    rajphoto New Member

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    Jun 5, 2014
    Does anyone know what draw, if any, a small dometic fridge might draw while running on propane? I have a 2000 Fleetwood Cheyenne, just curious. We're going to the maine coast for 6 nights, so I'm trying to decide if I should get a small solar panel. We'll be off grid, no generators, can't run the car etc.

    We have these led's and don't need a furnace - just trying to plan ahead...

    http://www.amazon.com/gp/product/B00BTL6FRG/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

    Raj
     

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