Also keep in mind that when AC coupling with legacy PV inverters without frequency-Watt capability, the battery based inverter will have reduced ability to regulate the battery charge.
A modern GT inverter will give you faster and more accurate charging. The older GT's, may not be good enough for me, and certainly not my clients. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail [email protected] [2] text 209 813 0060 On Fri, 12 Jun 2020 10:08:28 -0700, Mark Frye 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 by 0.5 Hz 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 [3] Jay Peltz power. On Jun 12, 2020, at 6:59 AM, Mark Frye [4] 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 (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: [email protected] [5] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [6] List-Archive: http://www.mail-archive.com/[email protected]/maillist.html [7] List rules & etiquette: www.re-wrenches.org/etiquette.htm [8] Check out or update participant bios: www.members.re-wrenches.org [9] _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] [10] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [11] List-Archive: http://www.mail-archive.com/[email protected]/maillist.html [12] List rules & etiquette: www.re-wrenches.org/etiquette.htm [13] Check out or update participant bios: www.members.re-wrenches.org [14] Links: ------ [1] http://members.sti.net/offgridsolar/ [2] mailto:[email protected] [3] https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf [4] mailto:[email protected] [5] mailto:[email protected] [6] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [7] http://www.mail-archive.com/[email protected]/maillist.html [8] http://www.re-wrenches.org/etiquette.htm [9] http://www.members.re-wrenches.org [10] mailto:[email protected] [11] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [12] http://www.mail-archive.com/[email protected]/maillist.html [13] http://www.re-wrenches.org/etiquette.htm [14] http://www.members.re-wrenches.org
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