Hi Chris, I have no direct experience trying to troubleshoot devices that can't handle frequency shift, that seems hard to do. However, I might utilize a relay approach to solve it. You could use the relay functions in the Sunny Island to start dropping strings and/or inverters to keep the frequency shift from occurring in the first place. There is probably a more elegant way to do this, but it may work. I believe there is a way to keep frequency shift from happening in one of the many setpoints on the Sunny Island. I think this is a serious disadvantage of frequency shift to control PV output because so many devices are designed to work at a precise frequency.
Good luck On Wed, Nov 18, 2020 at 8:09 AM Chris Anderson <[email protected]> wrote: > Wrenches community, > > Hope folks are well out there. I am wondering if anyone has > experience addressing a frequency oscillation with a split phase off grid > Sunny Island system. I am working on an off grid home project with 2 units > that has just not worked right since installation. The small number of 240 > volt loads and most notably the geothermal heat pump goes into a loud > vibration as the frequency shifts and does so for 20 seconds, then settles > down into normal operation. 45 seconds later, it does it again and just > repeats itself until the water in the storage tank is up to temperature. > The current draw doubles when it is vibrating and it seems to drain the > batteries faster than expected when left on. > > Wondering if anyone out there has any thoughts or is experienced off grid > tech in New England interested in some troubleshooting work to help resolve > things. > > Please email me directly if possible at the following address - > [email protected] > > Thanks and stay safe out there. > -- > > Best, > > [image: Borrego Solar] <https://www.borregosolar.com/> > > *Chris Anderson* | Senior Vice President > > E: [email protected] <[email protected]> | T: 978-513-2635 > <1-510-496-8721> | C: 603.732.2411 <1-510-496-8721> > > Borrego Solar Systems, Inc. > > 55 Technology Dr. #102, Lowell, MA 01851 > <https://goo.gl/maps/CRhMGZrLggMfLtuy5> | www.borregosolar.com > [image: borrego solar facebook] > <https://www.facebook.com/borregosolarsystems> [image: borrego solar > youtube] <https://www.youtube.com/user/BorregoSolar> [image: borrego > solar twitter] <https://twitter.com/Borrego_Solar> [image: borrego solar > linkedin] <https://www.linkedin.com/company/borrego-solar> > > Cultivate Potential > > > The contents of this message may be privileged and confidential. > Therefore, if this message has been received in error, please delete it > without reading it. Your receipt of this message is not intended to waive > any applicable privilege. Please do not disseminate this message without > the permission of the sender. > > The sender of this email may be acting on behalf of an entity or entities > that are affiliated with Borrego Solar Systems, Inc. and that are involved > in the subject matter of this email (“Subject Entities”). The use of > “Borrego Solar Systems, Inc” in the contact information of the sender is > solely for information purposes and should not be construed to implicate > Borrego Solar Systems, Inc., or any of its other affiliates, for the > obligations and liabilities of the Subject Entities. > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > 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/[email protected]/ > 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 > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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