I have experienced the same thing with Outback and PVPowered. DT --- On Tue, 7/28/09, Mark Dickson <m...@oasismontana.com> wrote:
> From: Mark Dickson <m...@oasismontana.com> > Subject: Re: [RE-wrenches] AC coupled with grid and backup generator > To: jry...@netscape.com, "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org> > Date: Tuesday, July 28, 2009, 12:40 PM > > > > > > > > > > > > > > > > > Jeff, > > > I had this > same hesitation when we first > fired up our AC coupled system. When speaking with > Steve at outback and he was > pretty sure that the generator would put out dirty enough > power that the > Fronius inverter would not like it and shut down. He > was correct—it goes into > an error mode as soon as the geni kicks on. Once the > generator shuts down the > Fronius senses the frequency is back within range and > resets itself. Turned > out to be a simple solution and has been operating > flawlessly for almost a year > now. > > > > > Good > luck! > > > > > > > Mark > Dickson > > Oasis Montana > Inc. > > > > > > > > > > > > From: > re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] > On Behalf Of > Jeff Yago > > Sent: > Tuesday, July 28, 2009 6:55 > AM > > To: > RE-wrenches > > Subject: Re: > [RE-wrenches] AC > coupled with grid and backup generator > > > > > > > > > > > > We are completing a residential 4 kW solar system that is > on the grid, but has > backup battery-powered Xantrex 6 kW inverter, AC coupled > Sunny-Boy inverter, > and a 17 kW Kohler generator. The larger generator is > to allow operation > of a ground-source heat pump during winter which is not > supplied from > the inverter fed panel. We have added a relay > cut-out for the Sunny > Boy AC output to prevent over-charging the batteries during > utility outage, but > have some concerns about back-feeding the generator through > the 100 amp 240 VAC > transfer switch when the Sunny Boy thinks the grid is still > up. > > > > > > > > > > > > > Will the Sunny > Boy try to couple to the generator like it > will the inverter which will be feeding other house loads > during an outage and > if so, any risk? We have wired an aux. > switch contact on the > transfer switch to also lock out the Sunny Boy output using > the same relay > control as being used for high battery voltage cutout, but > this is adding other > issues related to needing multiple relays due to different > relay coil voltages. > > > > > > > > > > > > > > Anyone smoked a > large generator by back-feeding from > inverter when the loads are reduced or shut > off? > > > > > > > > > > > > > Thanks, > > > > > > > > > > > > > > Jeff > yago > > > > > > > > > > > > > > Netscape. > Just the Net You Need. > > > > > > > > > > > -----Inline Attachment Follows----- > > _______________________________________________ > 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
