Fridge quit cooling in the deep cold

[timvasqz]

Pete, thanks, I guess all the math is dependent on too many
factors. I think I will do an actual world test. when I pick up a
refer/fridge for my shop, I'll plug it into the inverter and check
the amp spent over a 24 hour period. The other advantage of a
compressor refer is capturing the heat from the spent compressor
energy in the winter.
Back to our constant shade tree addons and garage engineering for
the sake of cold Pepsi. I think bluebird got things wrong from the
start. in my outside refer compartment the refer coil is over a foot
from the wall on one side (refer is angled). boiler heat is intended
to be used to process the ammonia as the gas rises in the coil and
the heat passivly disapates up a natural convection of venting air.
gradual cooling is intended. here is some more info on the dynamic
http://www.rvmobile.com/Tech/Trouble/vent.htm

GregoryO'Connor of Tim&Greg
94ptca

--- In WanderlodgeForum@yahoogroups.com, Pete Masterson
wrote:
>
> Watts divided by volts = amps so 1000 watts (1 kW)/120 volts =
8.33
> amps.
>
> Since that is used over a period of 1 day (24 hours), that's an
> average of about .35 amps per hour.
>
> Figure in some loss due to the inverter, so about .5 amps per hour
is
> the use at 120 VAC.
>
> Then converting the 120 v amps to 12 v amps, you get an average
of
> about 5 amps per hour from the battery. Actual consumption at a
point
> in time may be higher -- so you also need to check the peak draw.
> What is the refrigerator's nominal power rating (amps or watts)
when
> it is running? The battery will 'feel' the actual draw, so it may
> draw down more quickly than it would if the average draw was the
> actual draw due to the physics of batteries.
>
> Check Consumer's Reports -- the energy calculation on _some_
> refrigerators is bogus (you use much more than they claim) but on
> others it is OK. So, check the energy use as calculated by CR
before
> you commit to buying a particular unit.
>
> Having an all-electric coach with a standard 22 cu ft side-by-
side
> door home-style refrigerator, I can assure you that's it's
practical
> to not have an LP gas refrigerator. I would suggest using a true
sine
> wave inverter (if possible) to get better efficiency from the
> refrigerator motor. The modified sine wave inverters cause the
motor
> to run hotter, using more electricity (than spec) and probably
> diminishing the eventual life span of the refrigerator compressor
motor.
>
> Pete Masterson
> '95 Blue Bird Wanderlodge WBDA 42 (For Sale)
> <http://www.aeonix.biz/BBforsale.html>
> El Sobrante CA
> aeonix1@...
>
>
>
>
> On Dec 24, 2008, at 8:27 AM, timvasqz wrote:
>
> > Glenn if it is possible to do the trade with minimal effort, I
think
> > I would revisit the inverter use of a modern green midsize refer
to
> > replace the amonia setup in my bus. I was looking at putting a
mid
> > size compressor style refer/refridge in the area I park our bus
to
> > transfer refer goods when docked because electric to run the
boiler
> > on the ammonia system seems high. Our rate for 200% of allotment
is
> > around $0.35 per kilowatt hour in Romoland.
> > the mid size combos have tags that claim they cost only $43 per
the
> > year to run at$0.16 per kilowatt. The math????
> > 4300 / 16 = 269 Kilowatts per year. 269 KW / 365 days = .7363
> > Kilowatts per the day to run.
> > Does anyone know of conversion math necessry to calc the battery
> > needed to invert 1 kw per the day??GregoryO'Connor ofTim&Greg
> > 94ptCa
> >
>