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<p>SSRs, especially AC SSRs made from thyrisotrs (scrs and/or
triacs) are "leaky" in general</p>
<p>so when turned OFF, can cause a shock.... Maybe not enough to
kill you but maybe enough</p>
<p>to make you fall off the roof !</p>
<p>I'm not sure why the disconnects aren't good enough which should
already be in place ?</p>
<p>boB<br>
</p>
<br>
<div class="moz-cite-prefix">On 8/29/2017 4:53 AM, Jason Szumlanski
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAE438R9u3yOJYjJ6yUMaKMWz_6oCQwsQoEg7zq4KfGDPFjCDWg@mail.gmail.com">
<div dir="ltr"><img class="mailtrack-img" alt=""
style="display:flex"
src="https://mailtrack.io/trace/mail/61e6e0ae47d647509d5f9897e72a2d668618eab4.png?u=1613865"
moz-do-not-send="true" height="0" width="0">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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.</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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.</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Jason
Szumlanski</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_extra">
<br>
<div class="gmail_quote">On Mon, Aug 28, 2017 at 10:19 PM,
Nick Soleil <span dir="ltr"><<a
href="mailto:nsoleil@enphaseenergy.com" target="_blank"
moz-do-not-send="true">nsoleil@enphaseenergy.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">
<div>The one-pole relay will work for de-energizing any
of the Enphase microinverters.<span class=""><br>
<br>
Nick Soleil
<div>Field Application Engineer<br>
<div>Enphase Energy</div>
<div>Cell: <a href="tel:%28707%29%20321-2937"
value="+17073212937" target="_blank"
moz-do-not-send="true">707-321-2937</a></div>
</div>
</span></div>
<div>
<div class="h5">
<div><br>
On Aug 28, 2017, at 6:03 PM, Drake <<a
href="mailto:drake.chamberlin@redwoodalliance.org"
target="_blank" moz-do-not-send="true">drake.chamberlin@<wbr>redwoodalliance.org</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>Hi Nick,<br>
<br>
I should mention that the inverters being AC
coupled are M-250s, not the new IQ series. Would
that make any difference?<br>
<br>
Thanks,<br>
<br>
<br>
Drake <br>
<br>
<br>
At 03:12 PM 8/28/2017, Drake wrote:<br>
<blockquote type="cite"
class="m_1729891901758427285cite">Hi Nick,<br>
<br>
<br>
At 11:20 AM 8/28/2017, you wrote:<br>
<blockquote type="cite"
class="m_1729891901758427285cite">Content-Language:
en-US<br>
Content-Type: multipart/alternative;<br>
boundary="_000_<wbr>56449940CA694DDAABB811FCC45A20<wbr>70enphaseenergycom_"<br>
<br>
You can use a one-pole relay. We show
one-pole switching in our zero-export,
self-consumption doc for PEL applications.<br>
<br>
Nick Soleil <br>
Field Application Engineer<br>
Enphase Energy<br>
Cell: <a href="tel:%28707%29%20321-2937"
value="+17073212937" target="_blank"
moz-do-not-send="true">707-321-2937</a><br>
<br>
On Aug 28, 2017, at 6:44 AM, Drake <<a
href="mailto:drake.chamberlin@redwoodalliance.org"
target="_blank" moz-do-not-send="true">
drake.chamberlin@<wbr>redwoodalliance.org</a>>
wrote:<br>
<br>
<blockquote type="cite"
class="m_1729891901758427285cite">Hello
Wrenches,<br>
<br>
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>
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>
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>
Alternatively, does anyone know of
reasonably priced, 2 pole solid state
relays?<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
<br>
Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
<a href="tel:%28740%29%20448-7328"
value="+17404487328" target="_blank"
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