[RE-wrenches] Rooftop DC disconnects; Solenoids

[Starlight Solar Power Systems]

Hey Allan,

Gigavac has many models. http://gigavac.com/ <http://gigavac.com/> Made in USA. I’ve installed about 60 of of the GX14 so far, no problems.

For batteries, here’s some specs on the MX14, 400 amp version. It will surge for 60 seconds at 1200 amps, 2000 amps for 10 seconds! Coil pickup is 4.3 amps @ 12V for 75ms, then holding current is only 240 milliamp. Might need an intermediate relay. If you do, then you can use 12-48V coil voltage.

The 350 amp model shows a UL list: 
"Hermetically sealed – UL listed: UL1604 for Class I & II, Div 2 and Class III for use in hazardous
locations, IP67 for temporary water immersion for 30 min, IP69K for perssure washing, SAE J1171 - external ignition protection, and ISO8846 for protection against ignition around flammable gasses."








On Sep 27, 2015, at 11:53 AM, Allan Sindelar <allan at sindelarsolar.com> wrote:

Larry,
What relay have you found that can handle battery/inverter current levels and would have a DC coil that could run off of the Classic's Aux? Even MDI's mercury contactors only go up to 100A.
Thanks, Allan
 
Allan Sindelar
 <mailto:allan at sindelarsolar.com>allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
505 780-2738 cell

 
On 9/26/2015 4:49 PM, Starlight Solar Power Systems wrote:
> Hello Howie,
> 
> I attached it to my email on 9-24-2015. In brief, a HV relay disconnects the PV array and optional relay disconnects the battery. Midnite plans to add the arc fault Aux feature. Here it is again:
> 
> 
> I asked Midnite about using the Aux circuit for control for ground or arc faults. They said this will (should) be added on the next firmware update. This means if an arc fault is detected, the Classic will shut down AND conductors leaving the array would be de-energized by switching off the HV relay. All automatically. A second relay could be connected to the battery for total system shutdown. Should be easy to build a circuit to re-energize everything after a fault.
> 
> Wouldn't this automatic method be better than waiting for someone to throw a switch to shut things down? You would have to run the low voltage control wire and perhaps put the relays in an enclosure. A disconnect switch could be in series for manual shutdown. What am I missing?
> 
> <Mail Attachment.png>
> 
> 
> 
> On Sep 26, 2015, at 9:20 AM, Howie Michaelson <howie at suncatchervt.com <mailto:howie at suncatchervt.com>> wrote:
> 
> Larry,
> Could you possibly sketch out a rough schematic for what you are talking about here? It would help me understand your suggestion better.
> Thanks, Howie
> Howie Michaelson
> NABCEP Certified Solar PV Installer™
> 
> Catamount Solar
> Renewable Energy Systems Sales and Service
> VT Solar Electric Incentive Partner
> http://www.CatamountSolar.com <http://www.catamountsolar.com/>
> 802-272-0004
> 
> 
> 
> 
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