<p>The key for me to breaking the less is more rule for offgrid would be, there is someone on scene that understands and can watch for possible AC coupling hiccups. I sure don't want to be going there and doing this myself.</p>
<p>Roof mounting of solar just has so many negatives for offgrid. I would only use a roof to supplement decent ground mounted arrays.</p>
<pre><strong><span>Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
<p>On Thu, 31 Oct 2019 09:52:42 -0600, Ray <ray@solarray.com> wrote:</p>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- html ignored --> <!-- head ignored --> <!-- meta ignored -->
<p>I don't think adding micro inverters is too crazy idea, since you already have a DC coupled array in the system. I just wouldn't go too much power over the base load though. Also splitting the array on East and West faces will help spread the production out over the day and avoid the clunky "on/ off" control from the frequency shift or relay control scheme. I'd also set the DC controller to do the final charging, maybe a 1/2 to 1 v higher than the setting for the AC coupled array. Basically as the batteries reach the absorption phase, the AC coupled array would drop first, and the DC coupled array would do the actual 3 stage charging. </p>
<p>I've been against AC coupled arrays for off grid, but I think they can be worked into a larger system as long as there is plenty of DC coupled array. In my mind, the AC coupled array offsets daily loads, while the DC actually charges the batteries. Maybe you could put some of the new subarray less likely to be shaded on DC, and then put the lower, more shaded modules on micro inverters?</p>
<pre class="moz-signature">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 11/1/19 9:04 AM, <a class="moz-txt-link-abbreviated" href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a> wrote:</div>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- meta ignored -->
<div>After doing research, it seems that the optimizers won't do what is needed for the shading and orientation issues. The modules will be on the east and west pitches of the roof. </div>
<div> </div>
There is an existing array with a Midnite Solar Classic. There are 4 sub-arrays of 3 modules each , all facing due south that act independently. <br />
<div>
<div> </div>
The new sub-array has more shading and orientation issues. We may need to cut more trees, but would rather not. </div>
<div> </div>
<div>Although it seems radical for an off grid system., I'm considering using microinverters, AC coupled to a Radian. Is this idea totally crazy?</div>
<div> </div>
<div>Thank you,</div>
<div> </div>
<div>Drake </div>
<br /> <br />
<blockquote class="atmailquote"><br /> ----- Original Message -----<br />
<div id="origionalMessageFromField" style="width: 100%; display: inline; background: #e4e4e4;">
<div style="display: inline; font-weight: bold;">From:</div>
<a class="moz-txt-link-abbreviated" href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a> "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a></div>
<br />
<div id="origionalMessageToField" style="display: inline; font-weight: bold;">To:</div>
<a class="moz-txt-link-rfc2396E" href="mailto:glenn.burt@glbcc.com"><glenn.burt@glbcc.com></a>, "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a><br />
<div id="origionalMessageSentField" style="display: inline; font-weight: bold;">Cc:</div>
<br />
<div style="display: inline; font-weight: bold;">Sent:</div>
Wed, 30 Oct 2019 16:11:20 -0700<br />
<div id="origionalMessageSubjectField" style="display: inline; font-weight: bold;">Subject:</div>
Re: [RE-wrenches] Off Grid Optimizers<br /> <br /> <br /> Probably for shading! I cut the trees down to avoid all shading offgrid. <br /> <br /> Dave Angelini Offgrid Solar<br /> "we go where powerlines don't"<br /> <a class="moz-txt-link-freetext" href="http://members.sti.net/offgridsolar/">http://members.sti.net/offgridsolar/</a><br /> e-mail <a class="moz-txt-link-abbreviated" href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a><br /> text 209 813 0060<br /> <br /> On Wed, 30 Oct 2019 19:02:58 -0400, "Glenn Burt" <a class="moz-txt-link-rfc2396E" href="mailto:glenn.burt@glbcc.com"><glenn.burt@glbcc.com></a><br /> wrote:<br /> > Then again, why optimizers?<br /> > Rapid shutdown MLPE exist without the complexity and cost of optimizers,<br /> so<br /> > I too am perplexed.<br /> > <br /> > Glenn<br /> > <br /> > -----Original Message-----<br /> > From: RE-wrenches <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><re-wrenches-bounces@lists.re-wrenches.org></a> On Behalf<br /> Of<br /> > William Miller<br /> > Sent: Wednesday, October 30, 2019 5:34 PM<br /> > To: RE-wrenches <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a><br /> > Subject: Re: [RE-wrenches] Off Grid Optimizers<br /> > <br /> > I think I know this one: For rapid shutdown?<br /> > <br /> > William<br /> > <br /> > Miller Solar<br /> > 17395 Oak Road, Atascadero, CA 93422<br /> > 805-438-5600<br /> > <a class="moz-txt-link-abbreviated" href="http://www.millersolar.com">www.millersolar.com</a><br /> > CA Lic. 773985<br /> > <br /> > -----Original Message-----<br /> > From: RE-wrenches [<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] On<br /> > Behalf Of Allan Sindelar<br /> > Sent: Wednesday, October 30, 2019 2:11 PM<br /> > To: RE-wrenches<br /> > Subject: Re: [RE-wrenches] Off Grid Optimizers<br /> > <br /> > Drake, I must be old school - why use optimizers?<br /> > Allan<br /> > <br /> > <br /> >> On Oct 30, 2019, at 1:00 PM, <a class="moz-txt-link-abbreviated" href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a><br /> wrote:<br /> >><br /> >> Hello Wrenches,<br /> >><br /> >> What is the best combination of charge controller and optimizer to use<br /> > with an off grid, battery based system? What combinations are<br /> problematic?<br /> > <br /> >><br /> >> Thank you,<br /> >><br /> >> Drake<br /> >> Athens Electric<br /> >> 740-856-9648<br /> >><br /> >><br /> >> _______________________________________________<br /> >> List sponsored by Redwood Alliance<br /> >><br /> >> List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /> >><br /> >> Change listserver email address & settings:<br /> >> <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /> >><br /> >> List-Archive:<br /> ><br /> <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.htm">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.htm</a><br /> > l<br /> >><br /> >> List rules & etiquette:<br /> >> <a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br /> >><br /> >> Check out or update participant bios:<br /> >> <a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br /> >><br /> > <br /> > _______________________________________________<br /> > List sponsored by Redwood Alliance<br /> > <br /> > List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /> > <br /> > Change listserver email address & settings:<br /> > <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /> > <br /> > List-Archive:<br /> ><br /> <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.htm">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.htm</a><br /> > l<br /> > <br /> > List rules & etiquette:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br /> > <br /> > Check out or update participant bios:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br /> > _______________________________________________<br /> > List sponsored by Redwood Alliance<br /> > <br /> > List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /> > <br /> > Change listserver email address & settings:<br /> > <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /> > <br /> > List-Archive:<br /> ><br /> <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br /> > <br /> > List rules & etiquette:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br /> > <br /> > Check out or update participant bios:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br /> > <br /> > _______________________________________________<br /> > List sponsored by Redwood Alliance<br /> > <br /> > List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /> > <br /> > Change listserver email address & settings:<br /> > <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /> > <br /> > List-Archive:<br /> ><br /> <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br /> > <br /> > List rules & etiquette:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br /> > <br /> > Check out or update participant bios:<br /> > <a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br /> <br /> -- <br /> <br /> _______________________________________________<br /> List sponsored by Redwood Alliance<br /> <br /> List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /> <br /> Change listserver email address & settings:<br /> <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /> <br /> List-Archive: <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br /> <br /> List rules & etiquette:<br /> <a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br /> <br /> Check out or update participant bios:<br /> <a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br /> </blockquote>
<br /><fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre">_______________________________________________
List sponsored by Redwood Alliance
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a>
</pre>
</blockquote>
</blockquote>
<div>-- <br />
<pre> </pre>
<pre> </pre>
</div>