[RE-wrenches] Two Load Questions

[Ray Walters]

Hi Allan;

I've used the energy star rated deep freezers with good results, and I 
use their annual kwh listing, and divide by 365 days.  I've found with 
actual measurements and not set to the coldest setting, that I can beat 
the E star ratings by up to 20% indoors.  Your outdoor in winter 
scenario will probably cut the run time down by 80%.  I've done that 
same trick, and the customers loved it, but they moved it in in the 
summer as it ran too much in the summer in 85 deg weather.


Ray Walters

On 12/10/2012 9:12 PM, Allan Sindelar wrote:
> Wrenches,
> We still try to encourage prospective off grid customers to do a full 
> load analysis as an initial step in the system design process. To the 
> point:
>
> 1) What is a good watt-hours/day figure to use for a typical, modern, 
> new, carefully chosen, fairly large conventional AC chest freezer, if 
> kept in a heated indoor location? Assume 65 degrees and seldom opened.
>
> I will encourage that the freezer be located in a shaded, protected 
> outdoor location, in order to greatly reduce winter energy 
> consumption, but I need a good base figure to work with.
>
> The proposed system will most likely be 48Vnom, so a Sundanzer or 
> similar DC freezer is out.
>
> 2) Same question for a ceiling fan, for general slow circulation of 
> winter heat. The energystar.gov list gives relative cfm efficiency but 
> not wattages. Is 55W still a good figure to use as a default?
>
>
> I have attached a condensed energystar.gov list for the freezers, but 
> wonder what other off grid Wrenches typically use. Also, I'm not sure 
> that Wrenches posts allow attachments, so this may not appear with my 
> message.
>
> Thank you,
> Allan
> -- 
> *Allan Sindelar*
> _Allan at positiveenergysolar.com_ <mailto:Allan at positiveenergysolar.com>
> NABCEP Certified Photovoltaic Installer
> NABCEP Certified Technical Sales Professional
> New Mexico EE98J Journeyman Electrician
> Founder and Chief Technology Officer
> *Positive Energy, Inc.*
> 3209 Richards Lane (note new address)
> Santa Fe, New Mexico 87507
> *505 424-1112*
> _www.positiveenergysolar.com_ <http://www.positiveenergysolar.com/>
>
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