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<div class="moz-cite-prefix">I've had the contacts arc and not
disconnect at 144 vdc. I used a modified relay from an electric
vehicle company: KTA services.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 4/4/2014 7:06 AM, Michael Morningstar wrote:<br>
</div>
<blockquote
cite="mid:36514148-B37A-4914-B0C4-1204413C4D4D@gmail.com"
type="cite">I've done just that with DC rated 24VDC relays
intended for marine and heavy equipment applications. No arcing
while disconnecting SQFlexes under load.
<div><br>
<div>
<div>On Apr 3, 2014, at 11:06 PM, Allan Sindelar wrote:</div>
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<div style="background-color: rgb(255, 255, 255); color:
rgb(0, 0, 0);" bgcolor="#FFFFFF" text="#000000"> Wrenches,<br>
For my own off grid home, I would like to add four 60-cell
modules as a supplemental array, using a Midnite Classic
charge controller. I would like to set up a relay between
this array and the controller to allow me to direct the
output to an SQFlex submersible well pump, using a float
switch to send the coil signal. The float switch in my
storage tank would send a call for water to the relay,
which would then allow array current to flow to the pump
during daylight hours. Once the tank is full, the relay
switches, allowing array current to flow to the Classic to
charge my batteries. I have 24V battery DC available in
the well location as well.<br>
<br>
Would a standard open contact DPDT power relay with a 24V
DC coil work here? The contact terminals are rated for AC,
not 125V DC. If I connect the two sets of contacts in
series, that would reduce but not eliminate arcing. Has
anyone tried this?<br>
<br>
This seems like the simplest solution, but I'm open to
other suggestions as well.<br>
Thanks, Allan<br>
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<p class="MsoNormal"><b>Allan <span
class="SpellE">Sindelar</span></b><br>
<span style="font-size:10.0pt"><a
moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><u><span
style="color:#000099">Allan@positiveenergysolar.com</span></u></a></span><br>
<span style="font-size:10.0pt">NABCEP
Certified PV Installation Professional<br>
NABCEP Certified Technical Sales
Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <b>Positive Energy,
Inc.<o:p></o:p></b></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt">A Certified B <span
class="SpellE">Corporation<sup><span
style="font-size:7.5pt">TM</span></sup></span><st1:address
w:st="on"><br>
<st1:city w:st="on">Santa Fe</st1:city>,
<st1:state w:st="on">New Mexico</st1:state><st1:postalcode
w:st="on"></st1:postalcode></st1:address><br>
<b>505 780-2738 cell</b><br>
<o:p></o:p></span></p>
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