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Topic: Refrigerator install on my 1997 U270 36' Finished(updated) (Read 1750 times) previous topic - next topic

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #25 –
Here are the simple formulae for various electrical calculations.

Keith


For Watts

Volts x Amps = Watts

For Amperes

Watts / Volts = Amps

For Volts

Watts / Amps = Volts

For Resistance Ohms

Volts / Amps = R Resistance in Ohms
Keith, Joyce & Smokey the Australian Cattle Dog
1995 U320 SE Extreme 40' WTBI Build # 4780, with a Honda CR-V hopefully still following behind.
Motorcade # 17030
FMCA # F422159

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #26 –
I trust that when a unit like a refrigerator is rated at a certain # of amps, that this number is is a 50% Duty Cycle.  That means when it runs, it draws 5 amps, but only runs for 'half an hour' so then the rated draw is 2.5 amps per hour.  I see this particular unit shows this rating at 2.5 A.H. assume it is for 'governmental ratings',  trying to state that it draws 2.5 amps per hour( based on some annual temperature mid level base line or ?) that it could and then should-- be considered for running for 24 hours at this rate.

Engineers, am I off on this?

My old brain/info would then tell me that a unit's decal stating 2.5 A.H. would translate to 25 hours for 10 hours and 60 amp hours for a full day of service...(again, )under laboratory conditions to meet the 'label'/the best they could come up with.)

Not bad at all but nothing is perfect and all these numbers in our 'real' world should be some.... to a quite a bit higher, depending upon insulation, outside temps, air flow etc.etc. (non-laboratory conditions) I love efficiency so trying to learn here from any misconceptions, what I might be off on.....
Engineers?
Coach Build # 5862/40'/2001/U320/Motorcader 17136

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #27 –
It would be really useful to get some long-term test results with various refrigerator/battery bank combinations. Details such as ambient temperature and any refrigerator mods to turn off defrost cycles (for example) would also be helpful.

I would like to go the compressor-refrigerator route, but I also place a high value on the ability to boondock, and so I'm hesitant to make the switch without long-term, real-world results.
David and Carolyn Osborn
1995 U320C SE 40' Build 4726 Feb 1995
FMCA 147762
Motorcade 17186

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #28 –
I was just pointing out the math. It is very confusing converting from AC Watts to DC AMPS. I know several folks who have residential fridges that even two 8D's power sufficiently.
The selected media item is not currently available.Kent Speers
Locust Grove, OK
1993 U300 SSE 40' (Restored at FOT 2009) Build 4323
720 watts Solar
6V92TA DDEC Silver Engine
2014 Subaru Outback

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #29 –
Quote from: D.J. Osborn –
It would be really useful to get some long-term test results with various refrigerator/battery bank combinations. Details such as ambient temperature and any refrigerator mods to turn off defrost cycles (for example) would also be helpful.

I would like to go the compressor-refrigerator route, but I also place a high value on the ability to boondock, and so I'm hesitant to make the switch without long-term, real-world results.
David,
The power usage of these modern highly efficient refrigerators is only going to improve.  With the use of LVDC motors and LED's for lighting, etc., these units will use very little power.  If you boondock for extended periods and do not want to burn diesel for charging batteries, solar supplemental charging is the way to go.  All it take is money.  But it all makes more sense if you need to replace an expired absorption refrigerator.
Peter & Beth Martin
No Forrest? What have you done?
MC# 15890 until Dec 2016; FMCA #F329677
Cincinnati, OH

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #30 –
Quote from: D.J. Osborn –
It would be really useful to get some long-term test results with various refrigerator/battery bank combinations. Details such as ambient temperature and any refrigerator mods to turn off defrost cycles (for example) would also be helpful.

I would like to go the compressor-refrigerator route, but I also place a high value on the ability to boondock, and so I'm hesitant to make the switch without long-term, real-world results.

Over 119 days (2,852 hours) it used 74.68 KwH which is 26 watts average/hour using 2.1 average amps/hour of 12.6 volt battery.
Our Whirlpool refrigerator electric usage
The selected media item is not currently available.Barry BEAM #16014
2003 U320 40' AGDS
Beamalarm, Foretravel technical help and specifications
"Whatever the mind can conceive and believe, it can achieve"

Re: Refrigerator install on my 1997 U270 36' Finished(updated)

Reply #31 –
Quote from: Dave M –



My view of ruffing it requires a two man pup tent, K-Rats and lots of sand, mud & misery.
Why I no longer feel the need for ruffing it.
Been there
Dave M


Dave, you forgot your E Tool.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094