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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Yes, that is an aspect to this but not the root cause of the problem I am having.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The product manager explained that because the LG battery has an internal DC to DC converter, when it switches between charging and discharging, there is a appx 3 second loss of power when in backup mode. He described how one setup could be 2xLG Resu and 1x BYD as the BYD maintains constant voltage and no \u201clag.\u201d<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Still, my own personal LG in a StorEdge system has absolutely no issue like this so I\u2019m trying to figure out why this is a challenge in SMA but not SolarEdge.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>But back to my main problem, which is charging of the battery in backup mode, from the PV inverter. I am still awaiting his promised email, but he discussed setting country code to Ca Rule 21 to soften the charging points. He said setpoints for when to cease recharging (to prevents too high charging) is field adjustable but I find the SMA interface to be a complex, PhD level of complexity without much installer-level explanation.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>He also said if any of the three batteries were at this no-charge setpoint, this might cease PV charging so I\u2019ll check that and if that the case, I\u2019ll turn oof high SoC batteries and try to bring all up to common level. I sure hope this is not the case because that would be a serious software gap.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I\u2019ll share more as I get more info or learn more in the field.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Scot Arey<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> <b>On Behalf Of </b>Jerry Shafer<br><b>Sent:</b> Friday, July 10, 2020 6:01 PM<br><b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b>Subject:</b> Re: [RE-wrenches] SMA Sunny Storage AC-coupled with SB6.0 won't recharge LG Resu batteries during backup ops<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Scott, Wrenches<o:p></o:p></p></div><div><p class=MsoNormal>We have had systems with the SMA storage but we have used the BYD and have had no problems so far with recharge and operations all as expected, it may be an issue with LG programming and the SMA not communicating properly<o:p></o:p></p></div><div><p class=MsoNormal>JUerry <o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Fri, Jul 10, 2020 at 2:57 PM <<a href="mailto:scot.arey@solarcentex.com">scot.arey@solarcentex.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We have a design with Sunny Storage 6.0 inverter, SB 6.0 PV inverter, the SMA Automatic Backup Unit, and three LG Resu batteries. Works like a charm during normal grid ops but when it goes into backup ops, the Sunny Storage increases frequency to between 60.6 with blips up to 61 hertz, resulting in the PV inverter throttling back from 5,000+ watts to between 1,300 to 345 watts.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The result is that the batteries do not recharge from the PV during backup mode, even when SoC is less than half capacity. This also means the max power through the ABU to the \u201cwhole house backup\u201d is the 6,000 watts from the Sunny Storage plus the (very) retarded power output of the SB PV inverter.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>SMA tech support just said, \u201cthat is normal, the LG Battery is the culprit and does not charge from PV in this setup.\u201d<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I was stunned because why else would I buy this ABU coupling setup\u2026Anybody have any ideas? I\u2019m hoping the Sunny Storage freq shifting ramp-up parameters can be adjusted so that PV inverter operations continue when the battery is at a less than full SoC.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><img border=0 width=294 height=116 style='width:3.0625in;height:1.2083in' id="gmail-m_-4657477985476396984Picture_x0020_1" src="cid:image002.png@01D65759.DE712070"><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><o:p></o:p></p></blockquote></div></div></body></html>