<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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; 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; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><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; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 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; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 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; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 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; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 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; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><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; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 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">
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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 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 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>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a 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 href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font><p class="MsoNormal" style="margin-right: 722.25pt;"><span style="font-size: 10pt;"><font face="Times New Roman, Times,
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