SSRs, especially AC SSRs made from thyrisotrs (scrs and/or triacs) are
"leaky" in general
so when turned OFF, can cause a shock.... Maybe not enough to kill you
but maybe enough
to make you fall off the roof !
I'm not sure why the disconnects aren't good enough which should already
be in place ?
boB
On 8/29/2017 4:53 AM, Jason Szumlanski wrote:
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.
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.
Jason Szumlanski
On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil
<nsol...@enphaseenergy.com <mailto:nsol...@enphaseenergy.com>> wrote:
The one-pole relay will work for de-energizing any of the Enphase
microinverters.
Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 <tel:%28707%29%20321-2937>
On Aug 28, 2017, at 6:03 PM, Drake
<drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@redwoodalliance.org>> wrote:
Hi Nick,
I should mention that the inverters being AC coupled are M-250s,
not the new IQ series. Would that make any difference?
Thanks,
Drake
At 03:12 PM 8/28/2017, Drake wrote:
Hi Nick,
At 11:20 AM 8/28/2017, you wrote:
Content-Language: en-US
Content-Type: multipart/alternative;
boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"
You can use a one-pole relay. We show one-pole switching in
our zero-export, self-consumption doc for PEL applications.
Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 <tel:%28707%29%20321-2937>
On Aug 28, 2017, at 6:44 AM, Drake
<drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@redwoodalliance.org>> wrote:
Hello Wrenches,
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.
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
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.
Alternatively, does anyone know of reasonably priced, 2 pole
solid state relays?
Thanks,
Drake
Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328 <tel:%28740%29%20448-7328>
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