[RE-wrenches] Well pump relay question

Ray Walters ray at solarray.com
Wed Apr 9 11:43:05 PDT 2014


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*
>> _Allan at positiveenergysolar.com_ <mailto:Allan at positiveenergysolar.com>
>> 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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