We have installed relays that distinguish between generator and grid power. They simply go in-between the solar and the service. They disconnect when the gen runs and reconnect when the grid comes back. They have worked so far as I know.
On Sun, Feb 28, 2021 at 12:32 PM Benn Kilburn <b...@skyfireenergy.com> wrote: > I had a similar scenario a few years ago and looked at the Generac SSM, > but for some reason(s) I cannot recall, could not go this route. > The system was on a house and the auto transfer switch and generator were > in a shack that was unreasonable to trench too, and we did not want to rely > on a wireless option. > > The solution we came up with was a contact that would disconnect the > inverters from the house panelboard upon a loss of voltage (grid). > Unfortunately we did not come up with a solution that would automatically > reconnect the inverters once the grid was restored... because we couldn’t > reliably distinguish between the generator and the grid, so it required a > manual reset once the customer could confirm they had grid power and not > running off the generator. > The client said they often did not know that there was a power outage so > there could be times they would not even know the inverters had shut off... > so I ran a low voltage line to a LED light in their kitchen area that > would come on upon loss of grid and would go out when the inverters were > manually reset. > > Benn Kilburn > SkyFire Energy > 780-906-7807 > > On Feb 25, 2021, at 6:40 AM, Nik Ponzio, Building Energy < > npon...@buildingenergyus.com> wrote: > > We are installing 25kW of PV on a service with an existing backup > generator (Eaton 30KW) and auto transfer switch. Because of the remote > location of the generator and transfer switch, we can not easily connect on > the grid-side of the transfer switch as we usually do (without cutting a > very long trench.) So we're looking for a way to lock out the solar during > generator use. And then, ideally, reconnect the solar automatically when > the grid is restored. > > Is there an off-the-shelf product available at this point to accomplish > this? > > I see a thread on here > <https://mailtrack.io/trace/link/7643522e54e5bd30057d2e139c7b93d1c488b655?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmsg23906.html&userId=6273276&signature=c4db635fbd2d1225> > from a couple years ago that recommended the Generac SMM for this type of > scenario. Any current thoughts on this approach? > > Any suggestions would be appreciated. > > > -- > Nik Ponzio > Building Energy > 1570 South Brownell Road > Williston, VT 05495 > direct: 802-318-7003 > npon...@buildingenergyus.com > http://www.BuildingEnergyVT.com > <https://mailtrack.io/trace/link/058e994a3bba9674653a69dd2a6976e0914d2761?url=http%3A%2F%2Fwww.BuildingEnergyVT.com&userId=6273276&signature=8b5247886585b42b> > > > > "Building Solutions for a Sustainable Future" > > _______________________________________________ > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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