On 09/20/2011 03:01 PM, Mike S wrote:
> At 04:49 PM 9/20/2011, Rocket J Squirrel wrote...
>> So where did I get the idea that the VF draws about the same as the
>> Norcold (which I measured at around 2.5 to 2.8 A?)
>>
>> MULLENDORE!
>>
>> From <http://www.westyventures.com/parts.html> : "...the fridge
>> operates on 12 or 24 volts ... Current draw on 12 volt is 2.5 amps
>> (average) with an average daily usage of 22 amp-hours."
>
> Don't compare apples and oranges (running current vs. average current).
>  From the same datasheet I linked, the Vitrifrigo is spec'd at 470 Watts
> average daily consumption. Now, Watts are power, not energy, so they're
> clearly confused about units. But I'd guess they're really talking about
> Watt-hours, which would equate to about a 1.6 Amp average draw (~54%
> duty cycle, which over 24 hours would be ~38 Amp-hours).
>
> No idea what westyventures is talking about, a 2.5 A average draw over
> 24 hours would be 60 Amp-hours??? Maybe they mean 2.5 A _nominal_, i.e.
> the typical draw when the compressor is running? If it really uses only
> 22 Amp-hours typical per day, then perhaps it has much better
> insulation/more efficient compressor and a much lower duty cycle? ...or
> maybe it's all marketing BS. I doubt a Norcold is twice as efficient as
> a Vitrifrigo (or 50% worse?), as the numbers imply.

It's all very confusing.

Someone on the list needs to put a Norcold and a Vitrofrigo in an oven,
say, 80 degrees F, and let them run for 24 hours after adjusting their
respective thermostats to achieve the same cabinet temp.

I need a grant. With that I can buy the reefers, the white lab coat, the
clip board, the test equipment, the big oven, and a blonde lab assistant.

-- RJS