[RE-wrenches] TL inverter with long DC Feeder
August Goers
august at luminalt.com
Tue Oct 7 08:03:08 PDT 2014
William,
We have bumped into similar dilemmas when needing remote DC disconnects
with TL inverters. I believe the Solectria you are using has two MPPTs?
Ideally, you would keep each string separate to benefit from the dual
trackers – this would mean four DC disconnects if you went with a standard
product like a Square D HU361RB. If you combine each of the two strings out
at the array(s) then you could get away with two disconnects, one for each
inverter. Neither option is ideal.
Best,
August
Luminalt
*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *William Miller
*Sent:* Monday, October 06, 2014 9:01 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] TL inverter with long DC Feeder
Friends:
If only an SMA would work here. But DC volts too low. We are using
Solectria PVI5200TLS.
We do not use PV wire. We transition to THWN-2 in conduit immediately.
William
Miller Solar
On Oct 6, 2014, at 8:30 PM, Chris Mason <cometenergysystems at gmail.com>
wrote:
I presumed SMA TL series.
On Mon, Oct 6, 2014 at 10:02 PM, Jerry Shafer <jerrysgarage01 at gmail.com>
wrote:
As i read the thread you say TL which TL SMA, AE ect. They have defferent
dc input designs
On Oct 6, 2014 12:21 PM, "jay peltz" <jay at asis.com> wrote:
I do believe the outback and midnite combiners have a lock hole to prevent
exactly your concern.
unauthorized access.
jay
peltz power
On Oct 6, 2014, at 11:40 AM, William Miller 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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--
Chris Mason
NABCEP Certified Solar PV Installer™
Solar Design Engineer
Generac Generators Industrial technician
www.cometsolar.com <http://www.cometenergysystems.com>
264.235.5670
869.662.5670
Skype: netconcepts
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