[RE-wrenches] TL inverter with long DC Feeder

[Isaac Opalinsky]

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.
[cid:image001.png at 01CFE248.3F9A1920]

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-bounces at 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 <cometenergysystems at gmail.com<mailto: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<mailto: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<mailto: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


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Chris Mason
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