<div dir="auto">Another nice-to-have feature would be Gen stop based on PV production. Customers dislike hearing their generator run to finish a charge cycle in the am when the sun is out. </div><div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Apr 11, 2026 at 1:01 PM Jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="ltr"></div><div dir="ltr">My thoughts exactly </div><div dir="ltr"><br><blockquote type="cite">On Apr 11, 2026, at 9:35 AM, Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"></div></blockquote></div><div dir="auto"><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">You're making the case for multiple AGS start setpoints. There should be a quiet time override SOC for AGS.</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Principal Solar Designer | Florida Solar Design Group</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">NABCEP Certified Solar Professional (PVIP)</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif"> </font></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><br></font></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 11, 2026 at 9:10 AM Zeke Yewdall 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="ltr"><div>A recent thread included Quiet Time in the list of non-included features with newer inverters. And I too have had customers asking for this. But, in many cases, I find that quiet time is not actually a useable feature for many current off grid houses with lithium batteries, and this is why.</div><div><br></div><div>With lead acid battery banks, we typically designed for the generator to start around 50% SOC. But, occasionally we could discharge down to 20% SOC without damaging the batteries long term. And, typical off grid houses were usually designed with fewer nighttime loads, compared to nowadays. So, if the battery bank hit 50% SOC at 9pm, but quiet times extended till 8am, we still usually had plenty of reserve left to wait till 8am before starting the generator without any additional failures or battery damage.</div><div><br></div><div>But a lot of current off grid systems with lithium batteries are sizing for a lower days of autonomy (because of the higher cost of lithium batteries, though that's changing now), and deeper regular depth of discharges. Generator start is often set at 20 or 30% SOC instead of 50%. If we are planning for regularly discharging below 50% SOC overnight, which I do commonly see, there's not nearly so much reserve capacity to wait for a generator start. If we hit 20% SOC at 9pm, with a smaller battery bank relative to the load, and a higher nighttime load from more things remaining on all night that we never used to have (routers, internet, heating system controls/pumps/etc), then the chances of us making it till 8am to wait for the generator start is a lot lower -- we risk a BMS shutdown of the battery sometimes betwen 0% and 10%, before 8am, which depending on the particular equipment can be a difficult situation to recover from. Many AIO's will only black start batteries from solar, not generator, and most (though not all) older charge controllers and inverters will not black start batteries from either solar or generator.</div><div><br></div><div>So, because we are using deeper discharges, using more energy overnight, and waiting longer before a SOC based generator start, we often don't have the option of waiting 4 or 8 hours or such to start the generator. It needs to start very soon after the call for it, or we run into further problems.</div><div><br></div><div>What would be ideal is a system that looks at SOC before quite times would start, and if it's not sufficient to make it through a typical night because it's been a cloudy day, starts and runs the generator a bit before quite times start, rather than hoping to make it to morning before running it. An experienced off grid owner can do this automatically, topping the batteries off before going into the night if they are too low. But unexperienced owners or ones who just don't watch their battery SOC all the time, will not. Perhaps we'll come up with AI driving controls that watch the typical batery use patterns and look at the weather forecast, and can do this, just like the experienced off grid operator does.</div><div><br></div><div>Zeke </div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr">Zeke Yewdall<div>PV Engineer</div><div>NABCEP #031508-89</div><div><a href="mailto:zeke@darkforestsolar.com" target="_blank">zeke@darkforestsolar.com</a></div><div>303-523-3592</div></div></div></div></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>
<span>_______________________________________________</span><br><span>List sponsored by Redwood Alliance</span><br><span></span><br><span>Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a></span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change listserver email address & settings:</span><br><span><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></span><br><span></span><br><span>There are two list archives for searching. When one doesn't work, try the other:</span><br><span><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a></span><br><span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out or update participant bios:</span><br><span><a href="http://www.members.re-wrenches.org" target="_blank">http://www.members.re-wrenches.org</a></span><br><span></span><br></div></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>