[RE-wrenches] Using same PV array for water pump, battery charging

[Roy Rakobitsch]

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" <
larry at starlightsolar.com> 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
>
>
>
>
>
>
>
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