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@positiveenergysolar.com_ <mailto:al...@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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