<div dir="ltr">Hi William,<br><div><br></div><div>I think you will find that the state of charge discrepancy will be a continual problem to contend with in voltage mode. The state of charge algorithm that the SI uses (and bases all decisions) is complex and not very Lithium compatible when at the ends of the state of charge spectrum (full, empty). The Sunny Island will continually interpret the SOC much too high when the eVaults are low because there isn't much voltage drop across most of the battery capacity.</div><div><br></div><div>Do you have RS485 communication going to the Sunnyboys? You will also need to set your Sunnyboys off-grid. </div><div><br></div><div>I would probably try to get a battery voltage based relay installed that opens the AC connection to the sunnyboys at 56V or so. </div><div><br></div><div>I would also call Fortress to see how well the SunnyIsland to BMS communications works. Even if SMA won't support it, Fortress may have some honest field experience by now and be able to advise. If the communication stops flowing, the SunnyIsland will register an external BMS fault and shut off which seems lower risk than having the bus voltage spike to 69V </div><div><br></div><div>Let us know what you learn on this one.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Oct 22, 2023 at 5:30 AM Chris Sparadeo via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</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="auto">Hi William,</div><div dir="auto"><br></div><div dir="auto">You will want to make sure that the eVaults are all running that same firmware and that terminator switches and battery ID #s are set correctly. High SOC and large incoming current could definitely be the reason why voltage skyrocketed up. </div><div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto"><br></div><div dir="auto">Chris </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 21, 2023 at 9:39 PM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</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="auto">12 kw PV nominal. Low tilt angle and old panels so reality is far less. </div><div dir="auto">5 e-vault 18.5 kWh batteries</div><div dir="auto">4 SI 6048</div><div dir="auto">2 SB 6000 US</div><div dir="auto"><br></div><div dir="auto">System operational for some years with flooded batteries. Just installed the e-vaults. I reset the system to factory defaults. I am not sure how to verify the system will properly offset frequency if batteries are full. </div><div dir="auto"><br></div><div dir="auto">Having just written this I realize there is a discrepancy between the SOC the SIs report (46%) and the SOC the e-vaults report (98%). It could be the SIs want to push a lot of charge to the e-vaults but they won’t accept the charge because they are charged. </div><div dir="auto"><br></div><div dir="auto">I installed 3 of the vaults temporarily a week ago. At first there was a large discrepancy between SOC from batteries to SIs. Eventually that delta reduced to 4%. Maybe this problem will resolve itself?</div><div dir="auto"><br></div><div dir="auto">What settings on the SI are necessary to enable frequency shifting?</div><div dir="auto"><br></div><div dir="auto">Thanks everyone for the response. There is nothing worse than being on-site and not knowing how to get a system to operate. I shut off the PV and will let the generator fill in the deficit until Monday. </div><div dir="auto"><div dir="auto"><div dir="ltr" class="gmail_signature"><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 21, 2023 at 4:57 PM Ray Walters via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</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"><u></u>
<div>
<p>What is the array size vs the battery size? Sounds like a big
array on a small battery for the voltage to go that high that
fast.<br>
</p>
<p>Ray <br>
Remote Solar<br>
</p>
<div>On 10/21/2023 5:46 PM, William Miller
via RE-wrenches wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Friends:</div>
<div dir="auto"><br>
</div>
<div dir="auto">I’m kinda stuck on a project setting up a SI/SB AC
coupled system off grid. When the SB inverters ramp up the
battery voltage jumps to 69 pretty quickly and the system shuts
off. </div>
<div dir="auto"><br>
</div>
<div dir="auto">I checked the mini-grid frequency and it does ramp
up to about 62+ but apparently not soon enough to curtail
charging. I shut off the SBs for now and we can rely on
generator. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Any advice via email or a phone call would be
appreciated. SMA can be less than helpful, especially for
systems with lithium batteries. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Thanks in advance. <br clear="all">
<div dir="auto">
<div dir="ltr" class="gmail_signature"><br>
William Miller<br>
Miller Solar.com<br>
805-438-5600<br>
<a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<pre style="font-family:monospace">_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: <a href="http://re-wrenches.org" style="font-family:monospace" target="_blank">http://re-wrenches.org</a>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" style="font-family:monospace" target="_blank">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" style="font-family:monospace" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
There are two list archives for searching. When one doesn't work, try the other:
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" style="font-family:monospace" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" style="font-family:monospace" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a href="http://www.re-wrenches.org/etiquette.htm" style="font-family:monospace" target="_blank">http://www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a href="http://www.members.re-wrenches.org" style="font-family:monospace" target="_blank">http://www.members.re-wrenches.org</a>
</pre>
</blockquote>
</div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><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" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><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" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><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" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><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>