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<div class="moz-cite-prefix">On 8/30/2017 5:54 AM, Drake wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20170830125426.2893E10130@che.dreamhost.com">
Hi boB,<br>
<br>
Would there be any issues with delayed control of the
microinverters? We
do plan to use disconnects for maintenance.<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
</blockquote>
<br>
<br>
I highly doubt there would be enough delay to worry about anything
regarding battery damage....<br>
<br>
Even with Rule 21 or its cousins in a normal home installation.<br>
<br>
boB<br>
<br>
<br>
<br>
<br>
<br>
<br>
<blockquote type="cite"
cite="mid:20170830125426.2893E10130@che.dreamhost.com">
At 06:27 PM 8/29/2017, you wrote:<br>
<blockquote type="cite" class="cite" cite="">Content-Type:
multipart/alternative;<br>
boundary="------------155C815B9802686293824DDD"<br>
Content-Language: en-US<br>
<br>
<br>
SSRs, especially AC SSRs made from thyrisotrs (scrs and/or
triacs)Â
are "leaky" in general<br>
<br>
so when turned OFF, can cause a shock.... Maybe not enough to
kill
you but maybe enough<br>
<br>
to make you fall off the roof !<br>
<br>
I'm not sure why the disconnects aren't good enough which should
already
be in place ?<br>
<br>
boB<br>
<br>
On 8/29/2017 4:53 AM, Jason Szumlanski wrote:<br>
<blockquote type="cite" class="cite" cite="">My vote would still
be to use
two single pole relays as suggested previously to kill each
leg. That way
you build in redundancy and dropping either leg will do the
trick. In
fact, it sounds like this would be even better than a two pole
relay for
the redundancy reason.<br>
<br>
The other factor is whether you are using NO or NC relays. My
engineer
requires NO relays in these cases so they would fail in the
open position
only. I'm not sure how this would work, or if it would work
with solid
state relays. I have never dug into this. My understanding is
that solid
state relays fail in the closed condition (shorted). This
would preclude
their use in a situation where opening the circuit is the
preferred
failure mode. Maybe someone with some more knowledge in this
area can
chime in on whether SSRs are a good idea in this scenario.<br>
<br>
Jason Szumlanski<br>
<br>
<br>
On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil
<<a href="mailto:nsoleil@enphaseenergy.com"
moz-do-not-send="true">
nsoleil@enphaseenergy.com</a>> wrote:<br>
<dl>
<dd>The one-pole relay will work for de-energizing any of
the Enphase
microinverters.<br>
<br>
</dd>
<dd>Nick Soleil <br>
</dd>
<dd>Field Application Engineer<br>
</dd>
<dd>Enphase Energy<br>
</dd>
<dd>Cell: <a href="tel:%28707%29%20321-2937"
moz-do-not-send="true">707-321-2937</a><br>
<br>
</dd>
<dd>On Aug 28, 2017, at 6:03 PM, Drake
<<a href="mailto:drake.chamberlin@redwoodalliance.org"
moz-do-not-send="true">
drake.chamberlin@redwoodalliance.org</a>> wrote:<br>
<br>
<blockquote type="cite" class="cite" cite="">
<dd>Hi Nick,<br>
<br>
</dd>
<dd>I should mention that the inverters being AC coupled
are M-250s, not
the new IQ series. Would that make any difference?<br>
<br>
</dd>
<dd>Thanks,<br>
<br>
<br>
</dd>
<dd>Drake <br>
<br>
<br>
</dd>
<dd>At 03:12 PM 8/28/2017, Drake wrote:<br>
<blockquote type="cite" class="cite" cite="">
<dd>Hi Nick,<br>
<br>
<br>
</dd>
<dd>At 11:20 AM 8/28/2017, you wrote:<br>
<blockquote type="cite" class="cite" cite="">
<dd>Content-Language: en-US<br>
</dd>
<dd>Content-Type: multipart/alternative;<br>
</dd>
<dd>Â Â Â Â Â Â Â Â
boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"<br>
<br>
</dd>
<dd>You can use a one-pole relay. We show
one-pole switching in
our zero-export, self-consumption doc for PEL
applications.<br>
<br>
</dd>
<dd>Nick Soleil <br>
</dd>
<dd>Field Application Engineer<br>
</dd>
<dd>Enphase Energy<br>
</dd>
<dd>Cell: <a href="tel:%28707%29%20321-2937"
moz-do-not-send="true">707-321-2937</a><br>
<br>
</dd>
<dd>On Aug 28, 2017, at 6:44 AM, Drake
<<a
href="mailto:drake.chamberlin@redwoodalliance.org"
moz-do-not-send="true">
drake.chamberlin@redwoodalliance.org</a>>
wrote:<br>
<br>
<blockquote type="cite" class="cite" cite="">
<dd>Hello Wrenches,<br>
<br>
</dd>
<dd>I am going to AC couple some Enphase
inverters and found some really
nice solid state, single pole relays to
control them with. Enphase says I
must use 2 pole relays for the control
current even though the
disconnects will turn off all power for
maintenance. <br>
<br>
</dd>
<dd>Enphase claims that the inverters will
not shut down reliably with
only one line opened. This does not make
sense to me in view of UL 1741.
Is Enphase correct in their claim, or are
there other reasons that both
poles need to be opened <br>
<br>
</dd>
<dd>I want to use the solid state relays
because the coil voltage is
between 3 and 32 volts. This would avoid
the need to add voltage dropping
series resistors to protect the coil for
higher battery
voltages.<br>
<br>
</dd>
<dd>Alternatively, does anyone know of
reasonably priced, 2 pole solid
state relays?<br>
<br>
</dd>
<dd>Thanks,<br>
<br>
</dd>
<dd>Drake <br>
<br>
</dd>
<dd>Â <br>
</dd>
<dd>Drake Chamberlin<br>
</dd>
<dd>Athens Electric LLC<br>
</dd>
<dd>OH License 44810<br>
</dd>
<dd>CO License 3773<br>
</dd>
<dd>NABCEP Certified Solar PV <br>
</dd>
<dd><a href="tel:%28740%29%20448-7328"
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<br>
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