Hard way, had system that was nearly equal size, it seemed when the DG Inverter exceed the battery by 50% the DG inverter would shut down and do the grid error thing. I THINK I had frequency shift, took a while to figure it out took many emails. If the DG inverter did not exceed half I was fine, If I connected full power input to DG it would kick out on clear days. I have only one experiance like this. But I have only one system that the DG was as big as the Battery inverter. Darryl
--- On Fri, 10/29/10, jay peltz <j...@asis.com> wrote: > From: jay peltz <j...@asis.com> > Subject: Re: [RE-wrenches] Charge Control in AC coupled system > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Friday, October 29, 2010, 12:11 PM > Hi Darryl, > > Interesting you mention is 50% rule. > Is this true for all bi-directional inverters? > And curious how you found out? hard way or via > engineer? > > thanks, > > jay > > > On Oct 29, 2010, at 9:18 AM, Darryl Thayer wrote: > > > The Morningstar relay driver can exercize an AC laod > to take the heaver loads from the inverter by controlling AC > loads as Jay mentions. > > > > BTW this works well but becareful to have the battery > system inverter larger than the direct grid inverter > otherwise the battery inverter will shut down the DG > inverter when you go much beyond 50% of the battery inverter > capacity. > > > > Darryl > > > > --- On Fri, 10/29/10, jay peltz <j...@asis.com> > wrote: > > > >> From: jay peltz <j...@asis.com> > >> Subject: Re: [RE-wrenches] Charge Control in AC > coupled system > >> To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > >> Date: Friday, October 29, 2010, 10:49 AM > >> Don't forget that you can use a AC > >> load as well for an AC coupled system. > >> > >> jay > >> peltz power > >> > >> > >> On Oct 28, 2010, at 8:25 PM, Kent Osterberg > wrote: > >> > >>> Howie, > >>> > >>> In an ac coupled system with Outback inverters > you > >> could use a diversion controller such as a > Morningstar > >> Tristar 60 on the dc side. That would allow > using an > >> ac coupled system and a nicely controlled finish > charge for > >> the batteries too. Since there is already a > MX60 to do > >> the finish charge in the system you are > considering, a > >> voltage controlled switch, like the Morningstar > relay > >> driver, could simply shut down the SB3000. > >>> > >>> Kent Osterberg > >>> Blue Mountain Solar > >>> > >>> > >>> Howie Michaelson wrote: > >>>> Hi All, > >>>> > >>>> I have done several AC coupled off-grid > systems > >> using Sunny Islands and > >>>> Sunny Boys, but I am now doing one with a > dual > >> stacked OB VFX3648 (with a > >>>> PSX240 on the Inverter out for load > balancing) and > >> a SB3000. There is > >>>> also an existing array that is running > through an > >> MX60. What I am > >>>> wondering about is how folks have set up > AC > >> coupled string inverters to > >>>> best utilize the solar gain while not > toasting the > >> batteries. I'm a big > >>>> fan of the tapering control offered by SMA > through > >> the frequency shift of > >>>> the SI's, but that's not available here. > >> What relay/contactor setup have > >>>> folks found most efficient and safe? > Thanks > >> in advance, > >>>> > >>>> Howie > >>>> > >>> > _______________________________________________ > >>> List sponsored by Home Power magazine > >>> > >>> List Address: RE-wrenches@lists.re-wrenches.org > >>> > >>> Options & settings: > >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >>> > >>> List-Archive: > >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > >>> > >>> List rules & etiquette: > >>> www.re-wrenches.org/etiquette.htm > >>> > >>> Check out participant bios: > >>> www.members.re-wrenches.org > >>> > >> > >> _______________________________________________ > >> List sponsored by Home Power magazine > >> > >> List Address: RE-wrenches@lists.re-wrenches.org > >> > >> Options & settings: > >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >> > >> List-Archive: > >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > >> > >> List rules & etiquette: > >> www.re-wrenches.org/etiquette.htm > >> > >> Check out participant bios: > >> www.members.re-wrenches.org > >> > >> > > > > > > > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > Options & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > List-Archive: > > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out participant bios: > > www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org