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:[email protected]] *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 <[email protected]> wrote: I presumed SMA TL series. On Mon, Oct 6, 2014 at 10:02 PM, Jerry Shafer <[email protected]> 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" <[email protected]> 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 _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- 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 _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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