[RE-wrenches] TL inverter with long DC Feeder

Mark Westbrock westbrock at positiveenergysolar.com
Mon Oct 6 13:41:11 PDT 2014


If you don't want to combine strings at the array, then I would use a
Square D HU361 for each string.  It is a lot of hardware, but not too
expensive and very straightforward for a lay person to shut off without
risk.

Cheers,

Mark

----
*Mark Westbrock*
Field Manager & Employee-Owner
NM EE98J Journeyman Electrician
NABCEP Certified PV Installation Professional
NABCEP Certified PV Technical Sales


<http://positiveenergysolar.com/>

Positive Energy, Inc.
510 S. Main St.
Las Cruces, NM 88001
office: 575-524-2030
cell: 575-640-2432
mw at positiveenergysolar.com <westbrock at positiveenergysolar.com>
www.positiveenergysolar.com



  <http://www.nabcep.org/installer-locator?state=NM>
<http://www.nabcep.org/installer-locator?state=NM>
<http://www.solarreviews.com/installers/positive-energy-solar/>
<http://www.bcorporation.net/>

On Mon, Oct 6, 2014 at 1:13 PM, All Solar, Inc. <allsolar at scswifi.net>
wrote:

> How about the Midnite Solar four pole disconnect?
> Can't remember the model number but recently installed one on a two string
> TL input circuit. They are made for disconnecting both positive and
> negative.
>
> Jeremy Rodriguez,
> President
>
> All Solar, Inc.
> 1463 M
> Penrose Colorado 81240
> 719-372-3808 office
> 719-372-3804 fax
> www.asolarelectric.com
>
> Sent by Jeremy's iPhone. Sorry for typos and shorthand!
>
> On Oct 6, 2014, at 12:40 PM, "William Miller" <william at millersolar.com>
> wrote:
>
> Wrenches:
>
>
>
> We are getting up to speed on using transformer-less inverters.  I have
> advocated long for the additional safety offered by these inverters but I
> am realizing the trade-offs with the new technology:  The implementation
> gets more complicated with the requirement for PV wire, OCPD and
> disconnecting means for plus and minus and plus providing  Arc Flash rated
> equipment.
>
>
>
> I am currently designing a system that will locate the PV about 400 feet
> from the residence.  The system will utilize 2 Solectria 5200 watt
> inverters at the residence.  I would like to provide disconnecting means
> for the 4 strings at the array, in case of any needed service or
> excavating.  Preferably I’d like the disconnecting means to be deployable
> by a lay person (i.e. the gardener).
>
>
>
> Finding an 8 pole, arc flash, 600 VDC rated disconnect is not easy.  I
> could install an Outback 8 circuit combiner with 8 touch-safe fuse
> holders.  The new combiners have had dead-fronts for a while now.  The
> gardener needs only to have a Philips screw driver to open this cover.  Any
> better ideas out there?
>
>
>
> Thanks,
>
>
>
> William
>
>
>
>
>
> <image002.jpg>
> Lic 773985
> millersolar.com <http://www.millersolar.com/>
> 805-438-5600
>
>
>
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