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<div class="moz-cite-prefix">I'd do the comparison against one of
the much cheaper energy star rated AC models. In my
comparisons,On the slight edge in efficiency isn't worth the
extra cost of the DC units. I've also had premature failures of
DC fridges due to low voltage. Finally using the inverter's built
in low voltage disco keeps the batteries from getting ruined if
the charge system is down, but loads stay on.<br>
I lived for years with a DC fridge, and my family has no desire to
go back.<br>
<br>
Ray Walters<br>
<br>
12/11/2012 12:54 PM, Jason Lerner wrote:<br>
</div>
<blockquote
cite="mid:88517F93-11AE-452B-A479-1EFA4AE7AEA6@rockisland.com"
type="cite">Hello Larry,
<div><br>
</div>
<div>I still install DC fridge/freezers in off grid systems for
efficiency, but also so that when the owners leave for the
weekend/week/month they can turn off the inverter and all the
associated phantom AC loads, but the DC freezer is still on.
When they come back, the meat in the freezer is still frozen.</div>
<div><br>
</div>
<div>Recently for a new off grid cabin we compared a Subzero 23
Cu. ft. fridge/freezer to a Sundanzer chest freezer and Sunfrost
all fridge which is 51 cu ft.combined. Using nameplate yearly
KWH's, retail price tags and putting the freezer in an
outbuilding we found the <span class="Apple-style-span"
style="font-size: 13px; ">sunfrost/sundanzer has 2.22 times
more cu ft at 60% of the subzero's energy consumption....at
66% of the cost of the Subzero. </span></div>
<div><span class="Apple-style-span" style="font-size: 13px; "><br>
</span></div>
<div><span class="Apple-style-span" style="font-size: 13px; ">Adding
additional PV/wiring/CC/racking to run the Subzero was going
to cost an additional $2500. The contractor building the
cabin brought up the point that the Sunfrost does stick out
farther into the kitchen then an "average" fridge and there
was going to be a cost associated with custom cabinets to
match that depth, possibly the same amount as adding extra
PV's...</span></div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Jason Lerner</div>
<div>Waldron Power and Light Co.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>On Dec 11, 2012, at 10:55 AM, Larry Crutcher, Starlight
Solar Power Systems wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">Why would one
specify DC voltage appliances or lighting for off grid
systems today when we have sub-buck-a-Watt PV solar power?
If you have space, you can make the added power that
conventional AC appliances draw for very low cost. It could
even be argued that the cost for DC items, wiring,
distribution gear and labor will cost much more than simply
adding more PV solar and staying all AC.
<div>
<div><br>
</div>
<div>I don't like wasting resources and I understand old
school thinking when PV modules were very expensive, but
with high efficiency AC appliances and low cost
inverters and PV modules, does it still make any sense?
Shine some light on my thinking.
<div>
<div>
<div>
<div>
<div>
<div><span class="Apple-style-span"
style="border-collapse: separate;
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medium; "><span class="Apple-style-span"
style="border-collapse: separate;
font-family: Helvetica; font-style:
normal; font-variant: normal;
font-weight: normal; letter-spacing:
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none; -webkit-text-size-adjust: auto;
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font-size: medium; ">
<div style="word-wrap: break-word;
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-webkit-line-break: after-white-space;
"><span class="Apple-style-span"
style="border-collapse: separate;
font-family: Helvetica; font-style:
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font-weight: normal; letter-spacing:
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orphans: 2; text-align:
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none; -webkit-text-size-adjust:
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<div style="word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space; "><span
class="Apple-style-span"
style="border-collapse:
separate; font-family:
Helvetica; font-style: normal;
font-variant: normal;
font-weight: normal;
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line-height: normal; orphans: 2;
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0px; font-size: medium; ">
<div style="word-wrap:
break-word; -webkit-nbsp-mode:
space; -webkit-line-break:
after-white-space; "><span
class="Apple-style-span"
style="border-collapse:
separate; font-family:
Helvetica; font-style:
normal; font-variant:
normal; font-weight: normal;
letter-spacing: normal;
line-height: normal;
orphans: 2; text-align:
-webkit-auto; text-indent:
0px; text-transform: none;
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2; word-spacing: 0px;
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0px;
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0px;
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none;
-webkit-text-size-adjust:
auto;
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0px; font-size: medium; ">
<div style="word-wrap:
break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space; "><span
class="Apple-style-span"
style="border-collapse:
separate; font-family:
Helvetica; font-style:
normal; font-variant:
normal; font-weight:
normal; letter-spacing:
normal; line-height:
normal; orphans: 2;
text-indent: 0px;
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widows: 2; word-spacing:
0px;
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none;
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"><span
class="Apple-style-span"
style="border-collapse:
separate; font-family:
Helvetica; font-style:
normal; font-variant:
normal; font-weight:
normal;
letter-spacing:
normal; line-height:
normal; orphans: 2;
text-indent: 0px;
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widows: 2;
word-spacing: 0px;
-webkit-border-horizontal-spacing:
0px;
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0px; font-size:
medium; ">
<div style="word-wrap:
break-word;
-webkit-nbsp-mode:
space;
-webkit-line-break:
after-white-space; ">
<div><br
class="Apple-interchange-newline">
Larry Crutcher</div>
<div>Starlight Solar
Power Systems</div>
</div>
</span></span>
<div><br>
</div>
</div>
</span></div>
</span></div>
</span><br
class="Apple-interchange-newline">
</div>
</span><br
class="Apple-interchange-newline">
</span><br class="Apple-interchange-newline">
</div>
<br>
<div>
<div>On Dec 10, 2012, at 9:12 PM, Allan
Sindelar wrote:</div>
<br class="Apple-interchange-newline">
<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
<div text="#000000" bgcolor="#FFFFFF">
Wrenches,<br>
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:<br>
<br>
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.<br>
<br>
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. <br>
<br>
The proposed system will most likely be
48Vnom, so a Sundanzer or similar DC
freezer is out.<br>
<br>
2) Same question for a ceiling fan, for
general slow circulation of winter heat.
The <a moz-do-not-send="true"
href="http://energystar.gov/">energystar.gov</a>
list gives relative cfm efficiency but not
wattages. Is 55W still a good figure to
use as a default?<br>
<br>
<br>
I have attached a condensed <a
moz-do-not-send="true"
href="http://energystar.gov/">energystar.gov</a>
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.<br>
<br>
Thank you,<br>
Allan<br>
<div class="moz-signature">-- <br>
<meta http-equiv="content-type"
content="text/html;
charset=ISO-8859-1">
<title></title>
<font face="Times New Roman, Times,
serif"><b>Allan Sindelar</b></font><br>
<small><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><font
face="Times New Roman, Times,
serif" color="#000099"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP
Certified Photovoltaic Installer<br>
NABCEP Certified Technical Sales
Professional<br>
New Mexico EE98J Journeyman
Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new
address)<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/"
target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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<span style="font-size: 10pt;"><br>
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