I've had the contacts arc and not disconnect at 144 vdc. I used a
modified relay from an electric vehicle company: KTA services.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/4/2014 7:06 AM, Michael Morningstar wrote:
I've done just that with DC rated 24VDC relays intended for marine and
heavy equipment applications. No arcing while disconnecting SQFlexes
under load.
On Apr 3, 2014, at 11:06 PM, Allan Sindelar wrote:
Wrenches,
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.
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?
This seems like the simplest solution, but I'm open to other
suggestions as well.
Thanks, Allan
--
*Allan Sindelar*
[email protected]_ <mailto:[email protected]>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), *Positive Energy, Inc.*
A Certified B Corporation^TM
Santa Fe, New Mexico
*505 780-2738 cell*
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