William,
Just to pile on here, if you're running 4 pairs of low-voltage dc for
400' you may be better off just sticking the inverters right there at
the array and making the long run as 240Vac. #2s on each inverter output
(22A?) would work, keeping voltage drop to 1.3%. If you choose to
combine inverter outputs right there at the array (you'd need ac
disconnects there anyway) you'd have to run #3/0 for a 1.3% drop. Not
sure whether that's more feasible for you.
DKC
On 2014/10/7 16:06, Isaac Opalinsky wrote:
William,
What is your string configuration? The SMA TL inverters have a very
low operating voltage window, going down to 125 Vdc, but you still
have the issue of the disconnect.
Have you looked at ABB’s (PowerOne) TL inverters:
http://www.abb.us/product/us/9AAC179447.aspx?country=US? They can be
programmed to operate down to 90 Vdc, and they give you the ability to
combine upstream and have the 2 MPPT’s operate as one, allowing you to
combine outside of the inverter and bring a single set of PV output
conductors to the inverter’s DC disconnect:
*Isaac Opalinsky *| Technical Trainer | *SunPower Corporation*
Desk 443-569-3476 | Cell 443-277-6286
*From:*RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org]
*On Behalf Of *William Miller
*Sent:* Tuesday, October 07, 2014 12:01 AM
*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 <cometenergysyst...@gmail.com
<mailto:cometenergysyst...@gmail.com>> wrote:
I presumed SMA TL series.
On Mon, Oct 6, 2014 at 10:02 PM, Jerry Shafer
<jerrysgarag...@gmail.com <mailto:jerrysgarag...@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" <j...@asis.com
<mailto:j...@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 <tel:805-438-5600>
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