I think you can leave it DC coupled and enable grid tie in the Sunny Island inverters. It might not be quite as efficient but a lot more cost effective. If you don't already have it Midnite makes a comm box that makes the Classic look like an SMA device. That might be helpful to coordinate MPPT and grid tie.
Brad On Mon, Feb 18, 2019 at 5:19 AM Mac Lewis <maclew...@gmail.com> wrote: > Hello Wrenches,, > > We have been asked to take an SMA Sunny Island System that is off-grid, > and convert it to a backup system (Quad stack). Currently, this is a DC > coupled system using Midnite charge controllers. We would like to add SMA > grid-tied inverters to backfeed excess power. I have located this document: > https://files.sma.de/dl/7910/SB-OffGrid-TI-US-en-19.pdf > > According to this document, there really isn't Sunny Boy inverters > available that can function as a backup for a system like this. Is this > true? > Do you know of any distributors that may have stock of the SB XXXXTLUS-12 > line of inverters that would work for this. > > Thanks for your assistance > > -- > > > > Mac Lewis > > *"Yo solo sé que no sé nada." -Sócrates* > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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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