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<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. <br>
</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?<br>
</p>
<pre class="moz-signature" cols="72">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:<br>
</div>
<blockquote type="cite"
cite="mid:bc032403a771511abee83c80ceac753ecdc8d62f@webmail.redwoodalliance.org">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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. <br>
</div>
<div><br>
</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><br>
</div>
The new sub-array has more shading and orientation issues. We
may need to cut more trees, but would rather not. <br>
</div>
<div><br>
</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><br>
</div>
<div>Thank you,</div>
<div><br>
</div>
<div>Drake <br>
</div>
<br>
<br>
<blockquote class="atmailquote"><br>
----- Original Message -----<br>
<div id="origionalMessageFromField"
style="width:100%;display:inline;background:rgb(228,228,228);">
<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>
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