Mark, The difference is that when AC coupled the power is coming backwards into the AC out. When it's charging from the grid or generator it is charging from the AC inputs. The inverter can control the charge from the inputs but not what is coming in reverse into the output.
Brad On Sun, Nov 3, 2019 at 6:10 PM Mark Frye <ma...@berkeleysolar.com> wrote: > OK Jay that makes sense. > > This must mean that there is a significant difference in the function of > the BB inverter when it is in off-grid mode vs when it is in grid > connected mode. > > On 11/3/2019 5:45 PM, jay wrote: > > No, older non frequency shift BB inverters don’t communicate that way. > > > > They have no communication with a Rule 21 GT inverter. > > > > The BB, it will just keep charging and charging with any extra energy > coming from the GT inverter. The BB has no regulation, there is no absorb > or float, just charge. > > > > jay > > > > peltz power > > > >> On Nov 3, 2019, at 4:31 PM, Mark Frye <ma...@berkeleysolar.com> wrote: > >> > >> OK, I am hearing this over and over and I just want to confirm that is > true even if the BB is older and does not have "NEW Frequency Shifting AC > Coupling". > >> > >> On 11/3/2019 4:26 PM, Dave Angelini Offgrid Solar wrote: > >>> The BB inverter will drive the grid inverter off frequency because it > is > >>> full/floating and the grid tie will stop producing power. This is how > AC > >>> coupling works but if something goes wrong, like programming gets > corrupted > >>> by surges or the battery hits an LBCO or HBCO AC power will stop. Or if > >>> this is being controlled by Soc and it gets wrong data or there is a > >>> network issue, or all of the other things that can happen that I have > not > >>> thought of. > >>> > >>> Why do you not want to build a normal DC couples system? I forget > >>> fast....Happy Hour! > >>> > >>> Dave Angelini Offgrid Solar > >>> "we go where powerlines don't" > >>> http://members.sti.net/offgridsolar/ > >>> e-mail offgridso...@sti.net > >>> text 209 813 0060 > >>> > >>> On Sun, 3 Nov 2019 16:17:39 -0800, Mark Frye <ma...@berkeleysolar.com> > >>> wrote: > >>>> Folks, > >>>> > >>>> Please allow me to ask another question: > >>>> > >>>> Suppose I have a bi-direction inverter/charge with no connection to > the > >>>> grid. > >>>> > >>>> I have GT inverter ac coupled and producing 2000w. The battery is in > >>>> float, and I have 2000w of load connected. All is well. > >>>> > >>>> Now suppose I remove the loads without disconnecting the GT inverters. > >>>> > >>>> The word is that something bad happens now. I would like to understand > >>>> what that bad thing is. > >>>> > >>>> I have one explanation that I think says that the GTs will continue to > >>>> produce the 2000w, and that energy will go into the batteries in an > >>>> unregulated fashion. When does this end, when the batteries blow up? > Is > >>>> that the consequence of not disconnecting the GT? > >>>> > >>>> With many thanks in advance for your help in understanding. > >>>> > >>>> 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 > > > _______________________________________________ > 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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