<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Arial",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Why don\u2019t you go solar direct no batteries? and use AC for your back up as the pump will do both. My experience says at least 60VDC to run the pump so 24 volt battery won\u2019t do
it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Arial",sans-serif">Tom Duffy<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><i><span style="font-family:"Arial",sans-serif;color:#006600">Senior Solar Design Engineer<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><img width="224" height="81" style="width:2.3333in;height:.8402in" id="Picture_x0020_1" src="cid:image001.jpg@01D54BDD.8299F0C0" alt="TSBLOGODPIx500x200"><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><a href="mailto:tom@solar-biz.com"><span style="color:#0563C1">tom@solar-biz.com</span></a><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">MAIN TOLL FREE:</span></b><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> 888-826-0939<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#006600">DIRECT:</span></b><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> 888-503-6772<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:maroon">International:</span></b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">
<b>001-575-539-2111</b><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#006600">PANAMA:</span></b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">
<b>507-836-5588 X 122<o:p></o:p></b></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">FAX: 520-844-8442</span></b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:maroon">www.thesolarbiz.com<o:p></o:p></span></i></b></p>
</div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org>
<b>On Behalf Of </b>Gary Higbee<br>
<b>Sent:</b> Tuesday, August 21, 2018 12:18 PM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> [RE-wrenches] DC-DC converter for SQFlex<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Wrenches,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I\u2019m assisting a customer and well person in replacing a failed Lorentz ETApump (after 15 years of intermittent use). We\u2019re looking for a quality DC-DC converter to power a not-yet- ordered Grundfos SQFlex 6 SQF-3 from a 24 V Surrette battery
bank (wish it was 48!). The pump draws a max of 8.4A and the curves say we\u2019ll need about 600 watts so I figure we\u2019d want at least 70 volts out. Ideal would be a higher DC output, say 200V (save a couple hundred feet of larger copper, greater efficiency) and
at least 3A (see questions).<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The primary power source will be 240V AC but my customer wants a fallback for battery operation. We plan to use the Grundfos IO 101 SQFlex switch box, which will switch to DC if the AC fails. Also the CU 200 SQFlex control unit, so we can
accommodate the existing float switch up the hill, etc.<o:p></o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<div>
<p class="MsoNormal">The Grundfos tech person I spoke with today said the DC system should be able to supply 8.4A, regardless of the DC voltage.The pump curve says we need 600W for maximum performance at the lift we\u2019ve got. It seems to me that if we\u2019ve got
200V and need 600W we\u2019d be drawing 3A. Yet if the Grundfos factory line is there should be 8.4A available that\u2019s 1680W. The tech guy said he didn\u2019t have specific information why we\u2019d need 8.4A regardless of pump input voltage. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The Grundfos Product Guide says:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><b>Max. ratings are as follows:</b><o:p></o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"><b>\u2022 Maximum power input (P1) of 1400 W</b><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><b>\u2022 maximum current of 8.4 A</b><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><b>\u2022 maximum speed of 3600 rpm </b>(think I read somewhere it\u2019s 3000 rpm for this helical rotor model)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><b>The pump delivers its maximum performance when one of the above parameters is reached.</b><o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Two questions:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">1) Do any of you have experience running the SQFlex on DC, and what to make of the 8.4A at any input voltage factory recommendation? Maybe basic amps/volts/power calculations aren\u2019t applicable given the pump electronics?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">2) Are you aware of any DC-DC converters that will get us from a nominal 24V battery bank to 200V, or somewhere between 70 and 200V, with an appropriate current limiting amp rating to get us at least 600W (depending on thoughts regarding
the above question)?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Gary<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Gary Higbee<br>
Windstream Solar<br>
Oregon License 17LRT<br>
Renewable Energy Consulting<br>
<a href="mailto:gary@windstreamsolar.com">gary@windstreamsolar.com</a><br>
541-954-3881<o:p></o:p></p>
</div>
</div>
</div>
</div>
</body>
</html>