Wrenches, If you are looking for a very good ATS, you need to look at ASCO that's what they do, from small less than 100 amp to high voltage multi 1000 amp units, they are a simple 2 wire start, l also use the Kohler products with no issues, l have AC Coupled off grid, DC Coupled on grid Fun times
On Fri, Sep 20, 2024, 8:36 AM August Goers via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hi Sam - > > It's been probably 6 or 8 years since I've selected a 3rd party automatic > transfer switch, but we used to use Briggs & Stratton products with good > results: > > > https://energy.briggsandstratton.com/na/en_us/homeowners/products/standby-generators/transfer-switches-and-accessories.html > > At least at the time, these had internal circuitry to do the transfer > between grid and offgrid operation with a pre-programmed delay of about 10 > or 20 seconds. We paired these frequently with Sunny Islands. > > Now that the major ESS manufacturers have Microgrid Interconnect Devices > (MIDs) for their systems, we don't have any reason to use these. > > Best, > > August > Luminalt > > > On Fri, Sep 20, 2024 at 7:35 AM Sam Haraldson via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Wrenches, >> >> We are primarily a grid-tied solar EPC but like many solar companies have >> a long history with small off-grid installations. In the past few years we >> have been tackling a handful of large, complex, grid-tied battery-backup >> systems (sub 90 kwh) range with some working flawlessly and some plagued >> with weekly quirks. A weak link we've found in two of these installations >> was our choice to use Generac Automatic Transfer Switches. In order for >> this ATS to sense a grid outage and perform its transfer it relies on >> circuitry built into a Generac generator as well as a source of 12v power >> (typically the generator start battery). >> >> One of our sites doesn't have a generator at all and the other does, but >> the grid sensing circuitry in the ATS is bypassed as we want the Sol-Arks >> to be the first-line of power during an outage and not the generator. In >> order to accomplish this our electrician designed custom circuitry for grid >> sensing which is powered by a separate 12v source, has a 10 second delay, >> and flips the transfer switch during an outage placing the loads under the >> control of the Sol-Arks. >> >> Our initial design for these systems did not take into consideration that >> a Generac ATS doesn't have its own "brains" to grid sense and since we are >> now relying on a small custom circuit and a small external 12v power supply >> to act as a key player in an otherwise powerful and robust backup system we >> are second guessing our equipment choice. What ATS solutions are Wrenches >> employing that we should be considering? >> >> TL;DR - what are the simplest ATS solutions that sense the grid >> (frequency, voltage, et al) and self-switch between backup and grid power >> automatically? >> >> Sincerely, >> Sam >> >> >> [image: OnSite Energy] >> <https://www.google.com/url?q=https://onsiteenergyinc.com/&source=gmail-html&ust=1677085494759000&usg=AOvVaw2NN36GoM1sjnS4RdC8Svt-> >> >> SAM HARALDSON >> Operations Specialist >> (406) 551-6135 >> 1515 N. Rouse Ave Bozeman, MT 59715 >> <https://www.google.com/maps/search/1515+N.+Rouse+Ave+Bozeman,+MT+59715?entry=gmail&source=g> >> Locally owned and operated since 2012 >> [image: B Corporation] <https://onsiteenergyinc.com/bcorp> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> 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 > > Pay optional member dues here: http://re-wrenches.org > > 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 Pay optional member dues here: http://re-wrenches.org 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
