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
