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<p>I agree that an inverter is your most viable voltage converter.
There is no good reason to go DC to DC that I can see. The other
option would be to switch the array to operate the pump directly.
Use a Charge controller that operates the array at the same
voltage the pump needs to operate at, and have an array transfer
switch from CC to pump.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/21/18 12:24 PM, MDElectricSolar
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADhQMc3=3ysjn3+wHK5Qy7PYT9HsLwvp-6htnnonODR_a=89_A@mail.gmail.com">
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<div class="gmail_default" style="font-size:small">Is there an
inverter, you could power it with 120 or 240V AC?</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Tue, Aug 21, 2018 at 11:17 AM Gary Higbee <<a
href="mailto:gary@windstreamsolar.com"
moz-do-not-send="true">gary@windstreamsolar.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space">Hi
Wrenches,
<div><br>
</div>
<div>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).</div>
<div><br>
</div>
<div>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.</div>
<div>
<div><br
class="m_6086810396882845202webkit-block-placeholder">
</div>
<div>
<div
style="word-wrap:break-word;line-break:after-white-space">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. </div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">The
Grundfos Product Guide says:</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><b>Max.
ratings are as follows:</b></div>
<div
style="word-wrap:break-word;line-break:after-white-space">
<div
style="margin:0px;font-stretch:normal;line-height:normal"><b>\u2022
Maximum power input (P<span
style="font-stretch:normal;line-height:normal">1</span>)
of 1400 W</b></div>
<div
style="margin:0px;font-stretch:normal;line-height:normal"><b>\u2022
maximum current of 8.4 A</b></div>
<div
style="margin:0px;font-stretch:normal;line-height:normal"><b>\u2022
maximum speed of 3600 rpm </b>(think I read
somewhere it\u2019s 3000 rpm for this helical rotor
model)</div>
<div
style="margin:0px;font-stretch:normal;line-height:normal"><b><br>
</b></div>
<div
style="margin:0px;font-stretch:normal;line-height:normal"><b>The
pump delivers its maximum performance when </b><b>one
of the above parameters is reached.</b></div>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">Two
questions:</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">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?</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">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)?</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">Thank
you,</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">Gary</div>
<div
style="word-wrap:break-word;line-break:after-white-space"><br>
</div>
<div
style="word-wrap:break-word;line-break:after-white-space">Gary
Higbee<br>
Windstream Solar<br>
Oregon License 17LRT<br>
Renewable Energy Consulting<br>
<a href="mailto:gary@windstreamsolar.com"
target="_blank" moz-do-not-send="true">gary@windstreamsolar.com</a><br>
541-954-3881</div>
</div>
</div>
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