I cant see this working well without some battery based inverter Jerry On Aug 17, 2015 10:10 AM, "Ray Walters" <[email protected]> wrote:
> HI Esteemed Wrenches: > > I am consulting on a system I have never seen, that consists of a 6.7Kw > Enphase roof mounted system, and 2 backup generators. Each generator has > an automatic 200 amp transfer switch to back up its own 200 amp panel. > Both 200 amp panels are fed by a 400 amp service from the grid. > The Enphase PV backfeeds a subpanel in another building which then is fed > by a 2 pole 60 amp breaker in one of the 200 amp panels. > Currently they are having issues with the generators kicking out because > of the Enphase inverters. That part I understand: you can't backfeed a > generator, or its voltage regulation freaks out. > > Now we get to the fun part: they want to create a third critical load > subpanel with loads selected from both 200 amp panels to be powered by > batteries and an inverter. > I am considering the Sunny Island since it makes the most sense with its > ability to signal the Enphase inverters to shut off when the batteries are > full. I also see this as a partial solution to the generator issue, since > normally the Enphase will be connected to the output side of the Sunny > Island. However, when the generator is used to charge, we will be back to > directly coupling the generator output to the Enphase. > > Here are some possible solutions I'm considering: > 1) Use a separate charger for the generator so that it will only feed DC > to the batteries, and not be AC coupled. > 2) convert the PV back to DC with charge controllers, but that would > involve ditching and adding another conduit run between buildings. > 3) Put the Enphase PV on a relay that would disconnect the PV when > charging with the generator. > 4) Something I haven't thought of that one of you clever folks can > suggest...... > > As always, thanks in advance for all you responses, > > -- > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > > _______________________________________________ > 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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