Hi Mark, Agreed that diversion is the way to go. As 4v above absorb volts is completely unworkable.
But I’m not sure that I agree about .5 hz will do anything. The new rule 21 inverters go off line at 64 hz. And there is a type of tapering based on hz shift, but it won’t shut off a new gt inverter at+ .5hz. Cheers Jay > On Jun 12, 2020, at 10:08 AM, Mark Frye <ma...@berkeleysolar.com> wrote: > > > Thanks Jay, > > I talked again with Magnum. > > I have the latest Rev 6.1 MS-PAE 4448 so the exact implementation has changed > from that described in AN002, 5/10. The current Rev. has changes designed to > improve interaction with the GT inverters. I didn't really get to the bottom > of that. But the critical aspect of this remains unchanged: > > - the Magnum will have shifted the frequency <down now> by 0.5 Hz <sufficient > to knock the GT inverters off-line> when the DC voltage rises to Absorb + 4V. > > This makes more sense than the 6V I had in my notes (which may have meant 6V > above Float.) > > With all this in mind, I think I will plan on using this feature as a backup > to an AC dump load controller set to maintain Float voltage. > > > >> On 6/12/2020 7:12 AM, Jay wrote: >> Hi Mark >> >> I found this which might be of help. >> >> https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf >> >> Jay >> Peltz power. >> >>> On Jun 12, 2020, at 6:59 AM, Mark Frye <ma...@berkeleysolar.com> wrote: >>> >>> Looking for confirmation from Wrenches who know Magnum inverters: >>> >>> - MS-PAE >>> >>> -ME-RC >>> >>> - Frequency shift enabled (battery type "Custom") >>> >>> - AC coupled PV inverters w/o frequency shift capability >>> >>> Function: >>> >>> At Absorb voltage frequency shift is zero, at Absorb voltage + 6 V, shift >>> is 0.5 Hz <grid ties pushed off-line> (in 0.3 volt increments) >>> >>> This is from my notes from a tech support call, but I am wondering if I >>> have it mixed up. Protecting at 6 volts above the Absorb seems a bit high. >>> >>> Thanks, >>> >>> Mark >>> >>> >>> _______________________________________________ >>> 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 >>> >> >> >> _______________________________________________ >> 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 >> > _______________________________________________ > 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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