<div dir="auto">Arcing would only happen when disconnecting pump during sunny periods, why not disconnect at dusk? Connecting pump will not arc due to soft start. Not sure about that particular charge controller,  but some controllers can use Aux relay logic to do this upon full SOC. The Midnite Classic comes to mind. Swithcing can be done with contactor.<div dir="auto">Just a thought. <br><br><div data-smartmail="gmail_signature" dir="auto"><br>Roy Rakobitsch<br>NABCEP Certified Small Wind Installer®<br>Certified Advanced Tower Climbing, Safety & Rescue<br>Wind/PV Design Engineer<br>Windsine LLC<br>631-514-4166<br><a href="http://www.windsine.org">www.windsine.org</a></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Feb 16, 2017 4:24 PM, "Starlight Solar Power Systems" <<a href="mailto:larry@starlightsolar.com">larry@starlightsolar.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hello Wrenches,<div><br></div><div>A customer has 3250 Watt PV array @ 139Voc. The PV controller is Magnum PT100. He wants to install a Grundfos SQFlex pump and be able to switch the DC from the PV controller to run the pump directly. He would like to switch midday after the battery (48V) is at a high SoC.<div><br></div><div>I’m looking for a switching arrangement to do this without arcing since it will be used a few times each week. Any have a recommendation? <br><div>
<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><span><br class="m_9074264266585012395Apple-interchange-newline">Thank you,</span><br><br><span>Larry Crutcher</span><br><span>Starlight Solar Power Systems</span><br><br></div><br class="m_9074264266585012395Apple-interchange-newline"></div><br class="m_9074264266585012395Apple-interchange-newline"></div><br class="m_9074264266585012395Apple-interchange-newline" style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br class="m_9074264266585012395Apple-interchange-newline">
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