<div dir="ltr"><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/61e6e0ae47d647509d5f9897e72a2d668618eab4.png?u=1613865"><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">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:(707)%20321-2937" value="+17073212937" target="_blank">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">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>
<u></u> <u></u> 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:(707)%20321-2937" value="+17073212937" target="_blank">707-321-2937</a><br>
<br>
On Aug 28, 2017, at 6:44 AM, Drake <<a href="mailto:drake.chamberlin@redwoodalliance.org" target="_blank"> 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:(740)%20448-7328" value="+17404487328" target="_blank">740-448-7328</a><br>
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