<div dir="ltr">Hi Chris,<div><br></div><div>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.</div><div><br></div><div>Good luck</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 18, 2020 at 8:09 AM Chris Anderson <<a href="mailto:canderson@borregosolar.com" target="_blank">canderson@borregosolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Wrenches community,<div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>Please email me directly if possible at the following address - <a href="mailto:canderson@borregosolar.com" target="_blank">canderson@borregosolar.com</a></div><div><br></div><div>Thanks and stay safe out there.</div><div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br><div style="font-size:12.8px"><font color="#000000" face="arial, helvetica, sans-serif">Best,</font></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><table 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2px;font-size:10pt;padding-top:0px;padding-bottom:0px"><b>Chris Anderson</b> <span style="color:rgb(241,138,0)">|</span> <span style="color:rgb(78,79,80)">Senior Vice President</span></p><p style="margin:0px;font-size:10pt;padding-top:0px;padding-bottom:5px">E: <a href="mailto:jpitera@borregosolar.com" style="color:rgb(152,152,154)" target="_blank">canderson@borregosolar.com</a> <span style="color:rgb(241,138,0)">|</span> T: <a href="tel:1-510-496-8721" style="color:rgb(152,152,154)" target="_blank">978-513-2635</a> <span style="color:rgb(241,138,0)">|</span> C: <a href="tel:1-510-496-8721" style="font-size:13.3333px;color:rgb(152,152,154)" target="_blank">603.732.2411</a></p><p style="margin:5px 10px 2px 0px;padding-bottom:0px"><span style="font-weight:900">Borrego Solar Systems, Inc.</span></p><p style="margin:0px;font-size:10pt;padding-top:0px"><a href="https://goo.gl/maps/CRhMGZrLggMfLtuy5" style="color:rgb(152,152,154)" target="_blank">55 Technology Dr. #102, Lowell, MA 01851</a> 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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:"Times New Roman";font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div>