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. Just a thought.
Roy Rakobitsch NABCEP Certified Small Wind Installer® Certified Advanced Tower Climbing, Safety & Rescue Wind/PV Design Engineer Windsine LLC 631-514-4166 www.windsine.org On Feb 16, 2017 4:24 PM, "Starlight Solar Power Systems" < [email protected]> wrote: > Hello Wrenches, > > 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. > > 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? > > Thank you, > > Larry Crutcher > Starlight Solar Power Systems > > > > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/[email protected]. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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